Wei Li

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Name: 李伟; Wei Li

Organization: Nankai University , China

Department: Institute of New Catalytic Materials Science

Title: Professor(PhD)

TOPICS

Material Chemistry

Inorganic Chemistry

Organic Chemistry

Polymer

UV Absorbents

Chemicals
References

Controllable self-catalytic fabrication of carbon nanomaterials mediated by a nickel metal organic framework

Co-reporter:Fang Zou;Song L. Chao;Yu X. Wang;Yan L. Wang;Qing X. Guan

Environmental Science: Nano 2017 vol. 4(Issue 1) pp:46-51

Publication Date(Web):2017/01/20

DOI:10.1039/C6EN00441E

Carbon nanomaterials and metal–organic frameworks are all research hotspots in the field of energy which have important applications in catalysis and electrochemistry. We present a self-catalytic and controllable strategy for the fabrication of different morphologies and species of carbon nanomaterials under different temperatures via a nickel MOF (Ni2(bdc)2dabco) as the precursor.

The synthesis and mechanistic studies of a highly active nickel phosphide catalyst for naphthalene hydrodearomatization

Co-reporter:Guoxia Yun;Qingxin Guan

RSC Advances (2011-Present) 2017 vol. 7(Issue 14) pp:8677-8687

Publication Date(Web):2017/01/23

DOI:10.1039/C7RA00250E

Although HDS and HDN reactions over transition metal phosphides have been widely studied, few publications about aromatic hydrodearomatization (HDA) over transition metal phosphides are found. Using ordered mesoporous Al-MCM-41 (Al-M) as the support, a series of supported nickel phosphide catalysts with different Ni/P molar ratios and loadings have been prepared by a temperature-programmed reduction and characterized. The HDA activity of naphthalene was measured in a fixed bed reactor at 250–330 °C and 3 MPa. The results showed that the catalyst with initial Ni/P molar ratio of 1.25 and 15 wt% loading displayed the highest HDA activity as well as 99.0% of selectivity of decalin at 270 °C, which is even higher than that of 0.5 wt% Pt–Al-M catalyst. As a comparison, the HDA performance of various catalysts was also examined. The results revealed that the presence of framework aluminum favors HDA processes and a synergistic effect between nickel phosphide and the suitable acidity resulted in an improvement of the catalytic activity. Finally, the possible reaction pathway of naphthalene hydrogenation (HYD) on nickel phosphide catalysts was proposed. Taking into consideration the high catalytic activity, Al-M supported nickel phosphide can be considered as a very efficient HDA catalyst to decrease the contents of aromatics in the fuels.

Pd/C-catalyzed synthesis of N-aryl and N-alkyl isoquinolones via CH/NH activation

Co-reporter:Zhen Shu, Yuntao Guo, Wei Li, Baiquan Wang

Catalysis Today 2017 Volume 297(Volume 297) pp:

Publication Date(Web):15 November 2017

DOI:10.1016/j.cattod.2017.02.005

Pd/C-catalyzed direct synthesis of N-aryl and N-alkyl isoquinolones was developed via the annulation reactions of benzamides and alkynes in high yields (up to 99%) through the cleavage of CH/NH bonds. The reaction was ligand-free and air was used as oxidant. High regioselectivities were found when unsymmetrical alkynes or meta-benzamides were used as substrates. The heterocyclic carboxamide substrates, such as furan and thiophene derivatives, also afforded the corresponding products in high yields.Download high-res image (160KB)Download full-size image

Reaction mechanisms of acetylene hydrochlorination catalyzed by AuCl3/C catalysts: A density functional study

Co-reporter:Fanfan Wan, Songlin Chao, Qingxin Guan, Gui-chang Wang, Wei Li

Catalysis Communications 2017 Volume 101(Volume 101) pp:

Publication Date(Web):1 November 2017

DOI:10.1016/j.catcom.2017.07.022

•The ER and LH mechanisms for acetylene hydrochlorination catalyzed by gold catalysts are studied.•Tri-coordinated gold chloride shows high activity in catalyzing acetylene hydrochlorination.•Cl-transfer is the key step in the LH mechanism to form a new vacant site to adsorb HCl strongly.Reaction mechanisms of acetylene hydrochlorination catalyzed by AuCl3/C catalysts were investigated by density functional theory calculations. Tri-coordinated gold chloride with a vacant site shows high activity in adsorbing HCl and C2H2. Mechanisms in the first adsorption of HCl and C2H2 on gold were found to be the Eley-Rideal (ER) and the Langmuir-Hinshelwood (LH) mechanisms, respectively. The transfer of Cl atom of AuCl3 to acetylene is the key step in the LH mechanism, which could form new vacant site to adsorb HCl effectively. Tri-coordinated gold was formed by removing Cl atom through addition reaction of acetylene in the induction period.

Controllable Assembly of Al-MIL-100 via an Inducing Occupied Effect and Its Selective Adsorption Activity

Co-reporter:Mo Qiu, Qingxin Guan, and Wei Li

Crystal Growth & Design 2016 Volume 16(Issue 7) pp:3639-3646

Publication Date(Web):June 9, 2016

DOI:10.1021/acs.cgd.6b00103

This work reports a novel method to selectively synthesize framework isomer MOF crystals. Al-MIL-100 and Al-MIL-96 are framework isomers and could be obtained purposefully by adding an inducing agent using a microwave irradiation method. The inducing agent has an occupying effect by a PO4 tetrahedron group, which favors the formation of basic building units of Al-MIL-100. Spontaneously, zeolite AlPO4 or SAPO-34 was employed as an inducing agent for rapid and controllable synthesis of single phase Al-MIL-100. The results show that the gradual releasing of phosphate from the solid surface during the early stage of synthesis plays a crucial role in the occupying action. Subsequently, a possible growth mechanism of Al-MIL-100 is proposed. Finally, the resulting Al-MIL-100 exhibits a nice stability and a remarkable selective adsorption ability for N-heterocyclic molecules from fuels.

Catalytic performance and deoxygenation path of methyl palmitate on Ni2P/SiO2 synthesized using the thermal decomposition of nickel hypophosphite

Co-reporter:Qingxin Guan, Fei Han and Wei Li

RSC Advances 2016 vol. 6(Issue 37) pp:31308-31315

Publication Date(Web):22 Mar 2016

DOI:10.1039/C6RA02601J

In this paper, the catalytic performance and deoxygenation path of methyl palmitate on Ni2P/SiO2 catalysts were systematically studied in a continuous flow fixed-bed reactor. A series of Ni2P/SiO2 catalysts (with different molar ratios of P/Ni and Ni2P loadings) were synthesized at 300 °C using the thermal decomposition of nickel hypophosphite. The increased molar ratio of P/Ni generates phosphate-rich nickel phosphide catalysts and increasing conversion. Interestingly, Ni2P/SiO2 showed significantly higher conversion of methyl palmitate in comparison with Ni/SiO2. Furthermore, an activation temperature higher than 500 °C would significantly reduce the catalytic activity, as a result of the sintering of Ni2P. The pressure in a range of 3.0 to 0.5 MPa almost has no effect on the deoxygenation of methyl palmitate, but significantly affects the reaction path and product distribution. Finally, a possible deoxygenation path over Ni2P/SiO2 was proposed based on a GC-MS investigation.

Copper(I)@Carbon-Catalyzed Carboxylation of Terminal Alkynes with CO2 at Atmospheric Pressure

Co-reporter:Bing Yu, Jia-Ning Xie, Chun-Lai Zhong, Wei Li, and Liang-Nian He

ACS Catalysis 2015 Volume 5(Issue 7) pp:3940

Publication Date(Web):May 20, 2015

DOI:10.1021/acscatal.5b00764

Activated carbon supported CuBr was found to be an efficient catalyst for the carboxylation of terminal alkynes under atmospheric pressure of CO2 using ethylene carbonate as solvent at 80 °C for only 2 h, as verified with 13CO2. Various terminal alkynes could react smoothly with CO2 and organic halides under the reaction conditions to afford the corresponding carboxylic esters. In addition, the catalyst can be easily recovered and reused at least five times without significant loss of activity.Keywords: alkynes; carbon dioxide; carboxylation; copper; heterogeneous catalysis

Comparison of four different synthetic routes of Ni2P/TiO2–Al2O3 catalysts for hydrodesulfurization of dibenzothiophene

Co-reporter:Ruchao Wei, Qingqing Zhu, Fei Han, Qingxin Guan and Wei Li

RSC Advances 2015 vol. 5(Issue 48) pp:38774-38782

Publication Date(Web):08 Apr 2015

DOI:10.1039/C5RA01899D

Ni2P/TiO2–Al2O3 is a very promising hydrodesulfurization catalyst, however the catalysts reported so far all use the temperature-programmed reduction (H2-TPR) method and the reduction temperature can be as high as 973 K. It is important to develop more feasible methods to prepare this material. Herein, Ni2P/TiO2–Al2O3 catalysts were successfully synthesized at a low reduction temperature (573 K) based on NiCl2·6H2O and NH4H2PO2 (method I). Three other methods were also used to prepare the Ni–P/TiO2–Al2O3 catalysts in this work. The catalysts were characterized using XRD, TEM, FT-IR, XPS, CO uptake, and N2 sorption measurements. Experimental results indicate that the preparation method had a major influence on the physicochemical properties of the catalysts and the HDS activity. Among the four methods examined, method I could more effectively suppress the formation of AlPO4 and favor the formation of Ni2P, which can be attributed to the relatively low reduction temperature and the flowing hydrogen used in this method. The hydrodesulfurization activity results indicate that the Ni2P/TiO2–Al2O3 catalyst prepared by method I gave a high HDS conversion of 100.0% at a reaction temperature of 583 K. The results suggest that method I provides a simple and energy-efficient route for the preparation of the Ni2P/TiO2–Al2O3 catalyst with excellent catalytic performance for the HDS of dibenzothiophene.

Modification with boehmite-derived alumina nanoparticles enhances mechanical properties of resin

Co-reporter:Qingxin Guan, Hui Wang, Bohan Chai and Wei Li

RSC Advances 2015 vol. 5(Issue 65) pp:52710-52717

Publication Date(Web):08 Jun 2015

DOI:10.1039/C5RA07952G

Nanostructured γ-Al2O3 with an average particle size of 90 nm was synthesized by coated silica in solution. As a type of hard template, the coated silica shell layer could decrease the sinter of alumina particles during the phase transition process at 550 °C. The average particle size of γ-Al2O3 is significantly affected by boehmite concentration, amount of sodium silicate, and layers of silica. The mechanical properties of waterborne acrylic resin were enhanced significantly after the addition of γ-Al2O3 nanoparticles with dispersant (SK-5040). For solvent-based polyurethane resin, the surface of γ-Al2O3 nanoparticles needed to be modified by stearic acid to achieve proper dispersion and stability. For comparison, the effect of different fillers (including ZnO, TiO2 and SiO2) was also tested under the same conditions.

Deoxygenation of methyl palmitate over SiO2-supported nickel phosphide catalysts: effects of pressure and kinetic investigation

Co-reporter:Fei Han, Qingxin Guan and Wei Li

RSC Advances 2015 vol. 5(Issue 130) pp:107533-107539

Publication Date(Web):14 Dec 2015

DOI:10.1039/C5RA22973A

In this paper, a series of Ni2P/SiO2 catalysts was synthesized using the thermal decomposition of hypophosphite precursors. The resulting catalysts were characterized using XRD, TEM, CO pulse adsorption, atomic adsorption spectroscopy and NH3-TPD, and the catalytic properties were investigated for deoxygenation of methyl palmitate at different pressures in a fixed-bed reactor. The results indicate that the catalysts at 1.0 MPa and 3.0 MPa have similar activity, and lower pressure is in favour of direct deoxygenation of methyl palmitate. Pseudo first order kinetics were employed to describe the reaction to understand the effect of pressure and temperature and active energy at different reaction pressures was calculated. According to the active energy, the scission of the C–O bond is more difficult than the C–C, and the HDO route was favored at higher reaction pressure and temperature.

Pd/C-Catalyzed Synthesis of Isoquinolones through CH Activation

Co-reporter:Zhen Shu;Dr. Wei Li;Dr. Baiquan Wang

ChemCatChem 2015 Volume 7( Issue 4) pp:605-608

Publication Date(Web):

DOI:10.1002/cctc.201403059

Abstract

The direct synthesis of isoquinolones from benzamides and alkynes through CH activation was developed by using Pd/C as a heterogeneous catalyst without a ligand under mild conditions. A variety of isoquinolones were obtained in good yields with excellent regioselectivities. The Pd/C catalyst could be recycled three times without a significant decrease in the activity (yields as high as 85 %).

A Potential Regularity for Enhancing the Hydrogenation Properties of Ni2P

Co-reporter:Rongguan Li

The Journal of Physical Chemistry C 2015 Volume 119(Issue 5) pp:2557-2565

Publication Date(Web):January 14, 2015

DOI:10.1021/jp511191e

Microwave-Assisted Synthesis of HKUST-1 and Functionalized HKUST-1-@H3PW12O40: Selective Adsorption of Heavy Metal Ions in Water Analyzed with Synchrotron Radiation

Co-reporter:Fang Zou;Runhan Yu;Rongguan Li ; Wei Li

ChemPhysChem 2013 Volume 14( Issue 12) pp:2825-2832

Publication Date(Web):

DOI:10.1002/cphc.201300215

Abstract

A simple, rapid and efficient synthesis of the metal-organic framework (MOF) HKUST-1 [Cu₃(1,3,5-benzene-tri-carboxilic-acid)₂] by microwave irradiation is described, which afforded a homogeneous and highly selective material. The unusually short time to complete the synthesis by microwave irradiation is mainly attributable to rapid nucleation rather than to crystal growth rate. Using this method, HKUST-1-MW (MW=microwave) could be prepared within 20 min, whereas by hydrothermal synthesis, involving conventional heating, the preparation time is 8 h. Work efficiency was improved by the good performance of the obtained HKUST-1-MW which exhibited good selective adsorption of heavy metal ions, as well as a remarkably high adsorption affinity and adsorption capacity, but no adsorption of Hg²⁺ under the same experimental conditions. Of particular importance is the preservation of the structure after metal-ion adsorption, which remained virtually intact, with only a few changes in X-ray diffraction intensity and a moderate decline in surface area. Synthesis of the polyoxometalate-containing HKUST-1-MW@H₃PW₁₂O₄₀ afforded a MOF with enhanced stability in water, due to the introduced Keggin-type phosphotungstate, which systematically occluded in the cavities constituting the walls between the mesopores. Different Cu/W ratios were investigated according to the extrusion rate of cooper ions concentration, without significant structural changes after adsorption. The MOFs obtained feature particle sizes between 10–20 μm and their structures were determined using synchrotron-based X-ray diffraction. The results of this study can be considered important for potentially wider future applications of MOFs, especially to attend environmental issues.

The synthesis and evaluation of highly active Ni2P–MoS2 catalysts using the decomposition of hypophosphites

Co-reporter:Qingxin Guan and Wei Li

Catalysis Science & Technology 2012 vol. 2(Issue 11) pp:2356-2360

Publication Date(Web):29 Jun 2012

DOI:10.1039/C2CY20146A

This paper presents the synthesis and evaluation of highly active Ni2P–MoS2 catalysts using the decomposition of hypophosphites. A family of catalysts have been prepared, whose activities were tested using the hydrodesulfurization of 4,6-dimethyldibenzothiophene. Furthermore, the synergy between Ni2P/Al2O3 and MoS2/Al2O3 beds was explained by the remote control model through a migration of hydrogen spillover.

Adsorption of Hg2+ from aqueous solution on functionalized MCM-41

Co-reporter:Zhen Zhu, Xinxin Yang, Liang-Nian He and Wei Li

RSC Advances 2012 vol. 2(Issue 3) pp:1088-1095

Publication Date(Web):05 Dec 2011

DOI:10.1039/C1RA00720C

Mesoporous MCM-41 has been functionalized using 3-aminopropyltriethoxysilane (KH550) and 3-(2-aminoethylamino)propyldimethoxymethylsilane (KH602). The adsorption behavior of Hg2+ on functionalized MCM-41 was investigated systematically. The adsorption rates were very fast and agreed well with pseudo second-order kinetics. The adsorption isotherms fitted the Langmuir model well. The modified MCM-41 adsorbent functionalized using KH602 (NM2) displayed the greatest mercury adsorption efficiency and residual concentration of Hg2+ was able to achieve drinking water standards. The regeneration capacity maintained 99.75% performance when the initial solution concentration was 4 mg L−1 (4000 ppb) at the tenth cycle, meeting the safe regulatory discharge standard for the first time. Meanwhile, regeneration by washing only with deionized water to remove residual surface Hg2+ can cut down the cost of traditional desorption agents and reduce damage to the structure of the adsorbent. Therefore, the adsorbent NM2 has potential and promising application in the field of water pollution control.

Effect of magnesium oxide on adsorption of Cd2+ from aqueous solution

Co-reporter:Zhen Zhu and Wei Li

RSC Advances 2012 vol. 2(Issue 12) pp:5178-5184

Publication Date(Web):08 Mar 2012

DOI:10.1039/C2RA20394D

Mesoporous MCM-41 was functionalized using magnesium nitrate hexahydrate (denoted as MM). The adsorption behavior of Cd2+ on functionalized MCM-41 was investigated systematically. The adsorption isotherms of MM for Cd(II) could be described by the Langmuir isotherm model. The adsorption rates were very high and agreed well with pseudo second-order kinetics. The modified MCM-41 adsorbent displayed excellent Cd2+ adsorption efficiency (210.96 mg g−1) and the residual concentration of Cd2+ achieved was in line with drinking water quality standards. The regeneration capacity maintained 99% performance when the initial solution concentration was 5 mg L−1 (5000 ppb) at the eighth cycle, meeting the safe regulatory discharge standard for the first time. Furthermore, regeneration by an ultrasonic cleaning method to remove residual surface Cd2+ can reduce both the cost of traditional desorption agents and damage to the structure of the adsorbent. Therefore, the adsorbent MM has potential as a promising application in the field of water pollution control.

Morphologically controlled synthesis of mesoporous alumina using sodium lauroyl glutamate surfactant

Co-reporter:Fei Xiu, Wei Li

Materials Letters 2010 Volume 64(Issue 16) pp:1858-1860

Publication Date(Web):31 August 2010

DOI:10.1016/j.matlet.2010.05.027

Mesoporous alumina with various morphologies has been successfully synthesized by a proper sol–gel process using sodium lauroyl glutamate surfactant as a template. Both the mesostructures and morphologies of the resulting alumina can be effectively controlled by adjusting the concentration of the sodium lauroyl glutamate surfactant present in the reaction system. Through characterization by X-ray diffraction, transmission electron microscopy, and N2 physisorption, the effects of sodium lauroyl glutamate on the mesostructure and morphology of the resulting materials have been investigated in detail, and a possible formation mechanism of the controlled morphologies is proposed. The resulting mesoporous materials showed a potential application in adsorption of toxic organic compounds, which was attributed to the porous structure, high BET surface area, and large pore volume.

Synthesis of Nickel Nanoparticles Supported on Boehmite for Selective Hydrogenation of p-Nitrophenol and p-Chloronitrobenzene

Co-reporter:Hao Liu;Jia Deng

Catalysis Letters 2010 Volume 137( Issue 3-4) pp:261-266

Publication Date(Web):2010 July

DOI:10.1007/s10562-010-0362-8

Nickel nanoparticles supported on boehmite were prepared by a modified electroless nickel-plating method and a direct reduction method. We mainly studied the catalyst synthesized by the direct reduction method. The as-prepared nickel catalyst was characterized by X-ray diffraction and high-resolution transmission electron microscopy. The catalytic behavior in selective hydrogenation of p-nitrophenol to p-aminophenol and p-chloronitrobenzene to p-chloroaniline was studied and compared with Ni–B/γ-Al2O3 catalyst prepared by incipient-wetness impregnation and Ni–B/Al2O3·xH2O catalyst synthesized by a coprecipitation method. The Ni–B/boehmite catalysts were found to be more reactive than the Ni–B/γ-Al2O3 and Ni–B/Al2O3·xH2O catalysts. The superior activity of the Ni–B/boehmite catalyst was attributed to the small Ni–B particles and large amount of structural water, which enhanced the hydrophilicity of the catalyst.

Zirconyl chloride: an efficient recyclable catalyst for synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 under solvent-free conditions

Co-reporter:Ying Wu, Liang-Nian He, Ya Du, Jin-Quan Wang, Cheng-Xia Miao, Wei Li

Tetrahedron 2009 65(31) pp: 6204-6210

Publication Date(Web):

DOI:10.1016/j.tet.2009.05.034

Synthesis and Magnetic Property of Fe-B Amorphous Alloy Nanowires by Inducing DC Magnetic Field

Co-reporter:Yi Han, Wei Li, Minghui Zhang, Keyi Tao

Acta Physico-Chimica Sinica 2008 Volume 24(Issue 6) pp:927-931

Publication Date(Web):June 2008

DOI:10.1016/S1872-1508(08)60038-8

One dimension (1D) Fe-B amorphous alloy nanowires with diameter of 50–80 nm and length of several micrometers were synthesized under weak DC (direct current) magnetic field by KBH4 reducing in aqueous solution. The structure, composition, and morphology were characterized by X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), and scanning electron microscope (SEM), respectively. The results revealed that the magnetic field led to the fabrication of Fe-B amorphous alloy nanowire structure. Vibrating sample magnetometer (VSM) has been used to detect the magnetic properties of the samples. The results showed that the inducing of magnetic field had obvious effect on the magnetic properties of the samples.

Preparation and Catalytic Performance of Ni-B Amorphous Alloy Supported by Chitosan/SiO2

Co-reporter:Meixia Wu, Wei Li, Minghui Zhang, Keyi Tao

Acta Physico-Chimica Sinica 2007 Volume 23(Issue 9) pp:1311-1315

Publication Date(Web):September 2007

DOI:10.1016/S1872-1508(07)60064-3

Ni-B amorphous catalyst supported by chitosan (CS)-modified silica (Ni-B/CS/SiO2) was prepared using impregnation-reduction method. The as-prepared catalysts were characterized using X-ray powder diffraction (XRD), fourier transform infrared (FTIR) spetra, inductively coupled plasma (ICP) spectrometer, Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). The results showed that the particle sizes, the surface content of Ni active species, and catalytic activity were improved by introducing chitosan to the surface of silica. In the hydrogenation of furfuryl alcohol (FA) to tetrahydrofurfuryl alcohol (THFA), the amorphous Ni-B/CS/SiO2 catalyst exhibited superior catalytic activity to the corresponding traditional Ni-B/SiO2 amorphous catalyst and Raney Ni.

Hydrogenation of furfuryl alcohol to tetrahydrofurfuryl alcohol on NiB/SiO2 amorphous alloy catalyst

Co-reporter:Yun Song;Minghui Zhang;Keyi Tao

Frontiers of Chemical Science and Engineering 2007 Volume 1( Issue 2) pp:151-154

Publication Date(Web):2007 May

DOI:10.1007/s11705-007-0028-2

NiB/SiO2 amorphous alloy catalyst was prepared by power electroless plating method and characterized by induction coupled plasma (ICP), Brunauer-Emmett-Teller method (BET), transmission electron microscope (TEM) and X-ray diffraction (XRD) techniques. The catalytic performance of NiB/SiO2 was investigated for the hydrogenation of furfuryl alcohol (FA) to tetrahydrofurfuryl alcohol (THFA). The effects of operational conditions, such as reaction temperature, pressure, and stirring rate were carefully studied. The proper conditions were determined as the following: pressure 2.0 MPa, temperature 120°C and stirring rate 550 r/min. A typical result with FA conversion of 99% and THFA selectivity of 100% was obtained under such conditions, which was close to that over Raney Ni.

Advances in chemical synthesis and application of metal-metalloid amorphous alloy nanoparticulate catalysts

Co-reporter:Zhijie Wu;Minghui Zhang;Keyi Tao

Frontiers of Chemical Science and Engineering 2007 Volume 1( Issue 1) pp:87-95

Publication Date(Web):2007 February

DOI:10.1007/s11705-007-0018-4

This paper reviews the advances in the chemical synthesis and application of metal-metalloid amorphous alloy nanoparticles consisting of transition metal (M) and metalloid elements (B, P). After a brief introduction on the history of amorphous alloy catalysts, the paper focuses on the properties and characterization of amorphous alloy catalysts, and recent developments in the solution-phase synthesis of amorphous alloy nanoparticles. This paper further outlines the applications of amorphous alloys, with special emphasis on the problems and strategies for the application of amorphous alloy nanoparticles in catalytic reactions.

Effect of template in MCM-41 on the adsorption of aniline from aqueous solution

Co-reporter:Xinxin Yang, Qingxin Guan, Wei Li

Journal of Environmental Management (November 2011) Volume 92(Issue 11) pp:2939-2943

Publication Date(Web):1 November 2011

DOI:10.1016/j.jenvman.2011.07.006

The effect of the surfactant template cetyltrimethylammonium bromide (CTAB) in MCM-41 on the adsorption of aniline was investigated. Various MCM-41 samples were prepared by controlling template removal using an extraction method. The samples were then used as adsorbents for the removal of aniline from aqueous solution. The results showed that the MCM-41 samples with the template partially removed (denoted as C-MCM-41) exhibited better adsorption performance than MCM-41 with the template completely removed (denoted as MCM-41). The reason for this difference may be that the C-MCM-41 samples had stronger hydrophobic properties and selectivity for aniline because of the presence of the template. The porosity and cationic sites generated by the template play an important role in the adsorption process. The optimal adsorbent with moderate template was achieved by changing the ratio of extractant; it has the potential for promising applications in the field of water pollution control.Highlights► High performance adsorbents for removal aniline were synthesized. ► Adsorbents were prepared by controlling template removal using an extraction method. ► The percentage removal of aniline was higher in acid solution. ► The adsorbents have promising applications in the field of water pollution control.

Catalytic dechlorination of monochlorobenzene with a new type of nanoscale Ni(B)/Fe(B) bimetallic catalytic reductant

Co-reporter:Yi Han, Wei Li, Minghui Zhang, Keyi Tao

Chemosphere (May 2008) Volume 72(Issue 1) pp:53-58

Publication Date(Web):1 May 2008

DOI:10.1016/j.chemosphere.2008.02.002

A unique type of nanoscale Ni(B)/Fe(B) bimetallic catalytic reductant was prepared and used for dechlorination of monochlorobenzene (MCB). The sample Ni(B)/Fe(B) was synthesized by an electroless plating method, in which nanoscale Ni(B) was deposited on the surface of nanoscale Fe(B) synthesized by chemical reduction. The results suggest that the nanoscale Ni(B)/Fe(B) bimetallic catalytic reductant has higher dechlorination efficiency than Ni/Fe(B) catalytic reductant prepared by replacing Fe(B) with Ni2+ in aqueous solution. The Ni content was found to be an important factor in catalytic dechlorination, with the dechlorination rate increasing with Ni content. The electroless plating method improve the efficiency of the Ni2+ in the solution. Dechlorination takes place with the existence of nanoscale Ni(B)/Fe(B) bimetallic catalytic reductant via a pseudo-first-order reaction.

A feasible approach to the synthesis of nickel phosphide for hydrodesulfurization

Co-reporter:Qingxin Guan, Xun Cheng, Rongguan Li, Wei Li

Journal of Catalysis (March 2013) Volume 299() pp:1-9

Publication Date(Web):1 March 2013

DOI:10.1016/j.jcat.2012.11.008

In this paper, we propose a simple and feasible method for synthesizing bulk and supported nickel phosphides from oxide precursors. The new approach uses a low hydrogen flow speed and is not affected by the heating rate. The results indicate that Ni2P can be synthesized at 600 °C from its oxide precursors with a mole ratio of Ni/P = 2/1. The hydrodesulfurization activity results indicate that the direct-reduction method shows excellent performance in the synthesis of supported catalysts.Graphical abstractBulk and supported nickel phosphides could be synthesized simply by the direct-reduction method from the phosphate precursor. The new approach requires a low H2 flow speed and is not affected by heating rate.Download high-res image (67KB)Download full-size imageHighlights► Bulk and supported nickel phosphides were prepared by the direct-reduction method. ► The new approach requires low H2 flow speed and is not affected by heating rate. ► The new approach shows excellent performance in the synthesis of catalysts.

Efficient adsorption and desorption of Pb2+ from aqueous solution

Co-reporter:Zhen Zhu, Wei Li

Journal of Environmental Chemical Engineering (December 2013) Volume 1(Issue 4) pp:838-843

Publication Date(Web):1 December 2013

DOI:10.1016/j.jece.2013.07.022

Zinc oxide-functionalized MCM-41 (ZM) was used for the removal of Pb2+ from aqueous solution, and variables of the system were studied. The experimental data were correlated with the Langmuir isotherm model. The maximum adsorption capacity of ZM for Pb2+ was found to be 549.87 mg/g at room temperature and the adsorption capacity was able to remove sufficient Pb2+ to achieve drinking water standards (<10 ng/mL). The thermodynamic parameters such as changes in free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) were derived to indicating that the adsorption process to be endothermic in nature. The efficiency of ZM for adsorption of Pb2+ did not change significantly and a maximum 1% decrease was observed after 10 cycles, meeting the safe regulatory discharge standard (<100 ng/mL). Moreover, a novel freezing regeneration method was developed that could reduce the cost of desorption and prolong the life of the adsorbent. Therefore, the adsorbent ZM has potential as a promising application in the field of water pollution control.

A novel synthetic approach to synthesizing bulk and supported metal phosphides

Co-reporter:Qingxin Guan, Wei Li

Journal of Catalysis (4 May 2010) Volume 271(Issue 2) pp:413-415

Publication Date(Web):4 May 2010

DOI:10.1016/j.jcat.2010.02.031

This paper presents a novel synthetic approach to synthesizing metal phosphides. Both bulk and supported Ni2P, Cu3P, MoP, and InP were synthesized by thermal decomposition of their metal oxide and hypophosphite precursors. Mechanistic studies of Ni2P were carried out using a separated-bed tube reactor, and the result indicates that NiO is reduced by PH3 (produced from decomposition of NaH2PO2) at 300 °C. Ni2P hollow spheres were successfully synthesized by this method, which indicates that it is possible to synthesize metal phosphides with special morphology by using metal oxides with special morphology as precursors.This approach uses metal oxide as precursors. Both bulk metal phosphides with special morphology and supported metal phosphides that are used as catalysts can be synthesized by this synthetic approach.Download high-res image (82KB)Download full-size image

Expanded graphite applied in the catalytic process as a catalyst support

Co-reporter:Wei Li, Chong Han, Wei Liu, Minghui Zhang, Keyi Tao

Catalysis Today (30 July 2007) Volume 125(Issues 3–4) pp:278-281

Publication Date(Web):30 July 2007

DOI:10.1016/j.cattod.2007.01.035

An amorphous NiB supported on expanded graphite (EG) catalyst was prepared as an example to show the superior characteristics of EG as a novel carbon support material. EG and the prepared catalysts were characterized by mercury porosimetry, inductively coupled plasma spectrometer (ICP), scanning electronic microscopy (SEM), transmission electron microscope (TEM) and selected area electron diffraction (SAED). The catalytic activities of prepared catalysts were investigated by the hydrogenation of sulfolene to sulfalone and the selective hydrogenation of p-chloronitrobenzene (p-CNB) to p-chloroaniline (p-CA). We showed that the prepared Ni-B/EG catalyst exhibited very high catalytic activity.

A new route to prepare supported nickel phosphide/silica–alumina hydrotreating catalysts from amorphous alloys

Co-reporter:Limin Song, Wei Li, Guanglei Wang, Minghui Zhang, Keyi Tao

Catalysis Today (30 July 2007) Volume 125(Issues 3–4) pp:137-142

Publication Date(Web):30 July 2007

DOI:10.1016/j.cattod.2007.02.033

Supported nickel phosphides were prepared by treating an amorphous Ni–B alloy on silica–alumina support with phosphine (15 vol.% PH3/H2) at relatively low temperature. The amorphous Ni–B/SiO2–Al2O3 precursors were synthesized by silver-induced electroless plating. The amorphous precursors and catalysts were characterized by X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, BET surface area and inductively coupled plasma measurements. The transmission electron micrographs of the Ni2P/SiO2–Al2O3 particles with their size ranging from 60 to 80 nm showed that they were homogeneously dispersed over the SiO2–Al2O3 support. The as-prepared catalysts exhibited an excellent catalytic activity in the hydrodesulfurization (HDS) of dibenzothiophene.

Alternative synthesis of bulk and supported nickel phosphide from the thermal decomposition of hypophosphites

Co-reporter:Qingxin Guan, Wei Li, Minghui Zhang, Keyi Tao

Journal of Catalysis (1 April 2009) Volume 263(Issue 1) pp:1-3

Publication Date(Web):1 April 2009

DOI:10.1016/j.jcat.2009.02.008

This paper presents an alternative method for the preparation of bulk and supported nickel phosphide by the heat treatment of a mixed salt precursor (nickel chloride and sodium hypophosphite) in a static protecting gas atmosphere up to 300 °C. After reduction at 500 °C, a Ni2P/MCM-41 catalyst exhibits good hydrodesulfurization activity for dibenzothiophene with a turnover frequency at 330 °C of 1.1×10−3 s−1.The synthesis of nickel phosphide has been achieved by a heat treatment of nickel chloride and sodium hypophosphite at 300 °C followed by reduction at 500 °C.Download high-res image (108KB)Download full-size image

The synthesis and evaluation of highly active Ni2P–MoS2 catalysts using the decomposition of hypophosphites

Co-reporter:Qingxin Guan and Wei Li

Catalysis Science & Technology (2011-Present) 2012 - vol. 2(Issue 11) pp:NaN2360-2360

Publication Date(Web):2012/06/29

DOI:10.1039/C2CY20146A

Controllable self-catalytic fabrication of carbon nanomaterials mediated by a nickel metal organic framework

Co-reporter:Fang Zou, Song L. Chao, Yu X. Wang, Yan L. Wang, Qing X. Guan and Wei Li

Environmental Science: Nano 2017 - vol. 4(Issue 1) pp:NaN51-51

Publication Date(Web):2016/11/22

DOI:10.1039/C6EN00441E