Co-reporter:Zhijun Huang;Fengwen Yan
Catalysis Letters 2017 Volume 147( Issue 2) pp:509-516
Publication Date(Web):28 November 2016
DOI:10.1007/s10562-016-1924-1
Organic materials have seldom been used in vapor-phase reaction due to their poor thermal stability. To solve this problem, toluene vapor-phase oxidation catalyst was fabricated by supporting vanadium oxide onto graphitic carbon nitride (g-C3N4), an organic material with excellent thermal and oxidative stability. The nitrogen-rich property provides g-C3N4 with abundant anchoring sites, leading to high dispersion of vanadium oxide. When used as catalysts for the oxidation of toluene, V–g-C3N4 exhibited greatly improved activity and selectivity to benzaldehyde compared to traditional catalyst. After the vapor-phase reaction at 330 °C for 6 h, no marked deactivation was observed. The TGA, XRD, FT-IR and XPS results revealed that V–g-C3N4 keeps constant during this high-temperature process.
Co-reporter:Bingfeng Chen, Fengbo Li, Zhijun Huang, Guoqing Yuan
Applied Catalysis B: Environmental 2017 Volume 200(Volume 200) pp:
Publication Date(Web):1 January 2017
DOI:10.1016/j.apcatb.2016.07.004
•Cu-Co bimetallic nanoparticles are coated with carbon layers.•Carbon layers over the nanoparticles protect them from deactivation.•Cu-Co@Carbon shows high selectivity in hydrogenolysis of HMF to DMF.•The catalyst is kept in good recyclability in six-run test.Cu-Co bimetallic nanoparticles coated with carbon layers have been developed through direct heating treatment of bimetallic oxide precursors incipiently deposited with polyethene glycol. The as-synthesized nanocatalyst performs excellently in chemoselective hydrogenolysis of 5-hydroxymethylfurfural to 2,5-dimethylfuran. The Co-based catalysts exhibit higher performance than Cu-based catalysts. Cu-Co@C (Cu: Co = 1:3) shows the highest yield of 2,5-dimethylfuran (99.4%). Bimetallic nanocatalysts are detailedly characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The bimetallic nanoparticles are entrapped by carbon shells that can protect them from oxidation and deactivation. The catalytic activity and selectivity are kept constant in a six-run recycling test. The synergistic effect between two metal components is helpful to enhance catalytic performance.Download high-res image (455KB)Download full-size image
Co-reporter:Zhijun Huang;Feng-Wen Yan
RSC Advances (2011-Present) 2017 vol. 7(Issue 3) pp:1318-1325
Publication Date(Web):2017/01/04
DOI:10.1039/C6RA26136A
A carbon nitride nanofibrous hydrogel was fabricated by self-assembly/gelation of carbon nitride aqueous solution derived from thermal evaporation of bulk graphitic carbon nitride. The structure, chemical composition and optical properties of the as-prepared nanofibers were well investigated. The π–π interactions between nitrogen containing aromatic rings and hydrogen bonds between hydroxyl and amino groups were the driving forces for the formation of nanofibers and the hydrogel. A fluorescent nanofiber suspension can be obtained by dilution of the hydrogel with water. Due to the excellent fluorescence properties and the high dispersion stability in water, the carbon nitride nanofibers can be employed as a fluorescent probe for the selective sensing of Cu2+.
Co-reporter:Bingfeng Chen;Fengbo Li
RSC Advances (2011-Present) 2017 vol. 7(Issue 34) pp:21145-21152
Publication Date(Web):2017/04/10
DOI:10.1039/C7RA03205F
Selective hydrodeoxygenation of 5-hydroxy-2(5H)-furanone (HFO) derived from furfural oxidation to γ-butyrolactone (GBL) provides a sustainable alternative to the petroleum-based process for γ-butyrolactone production. Furfural is first converted to HFO through selective photocatalytic oxidation by using air oxygen as the oxidant (yield: 85.0%). HFO is further converted to GBL through hydrodeoxygenation over noble-metal nanoparticles on mesoporous Nb–Zr mixed oxides. The conversion of HFO to GBL involves two reactions: hydrogenation catalyzed by active metal and dehydration over mesoporous solid acids. The catalytic properties of M/Nb–Zr mixed oxides (M = Pt, Ir, Ru, Rh and Pd) are related to the composition of support and active metal. The incorporation of zirconia into matrixes improves the thermal stability of mesoporous mixed oxides and increases the amounts of surface acid, which contributes to its catalytic selectivity to GBL. Pt/Nb5Zr5-550 exhibited the best catalytic performances with 97.3% selectivity of GBL at full conversion. The excellent performance can be correlated with the cooperative effect between active metal species and acid sites. The Pt-solid acid bifunctional catalysts show superior catalytic performance compared with conventional catalysts, such as Pt/H-ZSM-5, Pt/C, Rh/C or Pd/C. An overall GBL yield of 82.7% from furfural was obtained.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
Catalysis Science & Technology 2016 vol. 6(Issue 9) pp:2942-2948
Publication Date(Web):26 Nov 2015
DOI:10.1039/C5CY01805F
Graphitic carbon nitride (g-C3N4) shows great application potential in the activation of CO2 due to its basic surface functionalities and highly specific electronic properties. Herein, to improve its catalytic performance, g-C3N4 was activated by protonation using H2SO4. The texture, surface chemistry and electronic properties of the as-prepared g-C3N4 were then studied. The synthesis of cyclic carbonate from the cycloaddition of CO2 and epoxide was selected as a model reaction to investigate the catalytic performance. The protonated g-C3N4 exhibited a much higher catalytic activity than the pristine g-C3N4. The generation of terminal amino and hydroxyl groups due to the hydrolysis of g-C3N4 under acidic conditions as well as the higher specific surface area are responsible for the enhanced catalytic performance.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
Green Chemistry 2015 vol. 17(Issue 4) pp:2325-2329
Publication Date(Web):05 Feb 2015
DOI:10.1039/C4GC02330G
Alcohols are oxidized to aldehydes or ketones in water by directly using air as the oxidant. The catalytic conversions are based on a hybrid nanocatalyst with monodispersed Au nanoparticles embedded in a polyoxometalate self-assembly matrix. The oxidation processes exhibit excellent activity and selectivity.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
RSC Advances 2015 vol. 5(Issue 124) pp:102700-102706
Publication Date(Web):26 Nov 2015
DOI:10.1039/C5RA23419K
Porous and low-defect graphitic carbon nitride (g-C3N4) nanotubes were fabricated through heating precursors synthesized by recrystallization from H2SO4/methanol. The textural and chemical structures of the as-prepared samples were well studied. Recrystallization and subsequent heating result in g-C3N4 nanotubes with developed porosity and high specific surface area. Unexpectedly, the nanotubes exhibit much ordered tri-s-triazine conjugated network and fewer defects. Compared to bulk g-C3N4 prepared by direct heating melamine, the nanotubes demonstrate enhanced photocatalytic activity for hydrogen evolution under visible light irradiation. Besides the improved textural and chemical structures, the optimized optical and electronic properties are contributed to the enhanced photocatalytic performance.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
RSC Advances 2015 vol. 5(Issue 18) pp:14027-14033
Publication Date(Web):21 Jan 2015
DOI:10.1039/C4RA14616F
Nanoporous graphitic carbon nitride was prepared through direct heat treatment of guanidinium cyanurate at 550–600 °C in an air atmosphere. The BET surface area of the resulting materials can reach 200 m2 g−1. High porosity was developed through a heat-driven stacking of g-C3N4 nanosheets. The mechanism was revealed in detail through TEM and N2 adsorption measurements. Large-size g-C3N4 nanosheets are formed at 550 °C and stacked in a state similar to randomly creased paper slips. Further increase of treatment temperature to 600 °C results in curling and fragmentation of g-C3N4 nanosheets, which build up a highly porous matrix. Nanoporous graphitic carbon nitride with higher surface area exhibits better optical properties and has enhanced photocatalytic activity. The nanoporous g-C3N4 shows high photocatalytic activity for the decomposition of rhodamine (RhB) in an aqueous solution.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
Catalysis Science & Technology 2014 vol. 4(Issue 12) pp:4258-4264
Publication Date(Web):21 Jul 2014
DOI:10.1039/C4CY00832D
Nanosheets of graphitic carbon nitride were prepared through direct heat treatment of guanidinium chloride at 450–600 °C in air. The resultant materials had a surface area of 109.9 m2 g−1 and their physicochemical properties were closely related to the condensation temperature. Decomposition of rhodamine (RhB) in aqueous solution was selected as the model reaction to investigate the photocatalytic performance of nanostructured graphitic carbon nitride. The sample with higher surface area exhibited better optical properties and had enhanced photocatalytic activity. These findings suggest that graphitic carbon nitride prepared from guanidinium chloride will be promising for use in pollutants degradation and solar energy utilization.
Co-reporter:Bingfeng Chen;Dr. Fengbo Li;Zhijun Huang;Tao Lu;Yin Yuan; Guoqing Yuan
ChemSusChem 2014 Volume 7( Issue 1) pp:202-209
Publication Date(Web):
DOI:10.1002/cssc.201300542
Abstract
Levulinic acid is an important platform molecule from biomass-based renewable resources. A sustainable manufacturing process for this chemical and its derivatives is the enabling factor to harness the renewable resource. An integrated catalytic process to directly convert furfural to levulinate ester was developed based on a bifunctional catalyst of Pt nanoparticles supported on a ZrNb binary phosphate solid acid. The hydrogenation of furfural and the following alcoholysis of furfuryl alcohol were performed over this catalyst in a one-pot conversion model. Mesoporous ZrNb binary phosphate was synthesized by a sol–gel method and had a high surface area of 170.1 m2 g−1 and a large average pore size of around 8.0 nm. Pt nanoparticles remained in a monodisperse state on the support, and the reaction over Pt/ZrNbPO4 (Pt loading: 2.0 wt %; Zr/Nb, 1:1) gave a very high selectivity to levulinate derivatives (91 % in total). The sustainability of this conversion was greatly improved by the process intensification based on the new catalyst, mild reaction conditions, cost abatement in separation and purification, and utilization of green reagents and solvents.
Co-reporter:Fengbo Li, Bingfeng Chen, Zhijun Huang, Tao Lu, Yin Yuan and Guoqing Yuan
Green Chemistry 2013 vol. 15(Issue 6) pp:1600-1607
Publication Date(Web):27 Mar 2013
DOI:10.1039/C3GC00024A
Methanol carbonylation is the most important process for manufacturing C2 molecules from methanol. The present industrial carbonylation has been proven to be the most successful process on economical grounds. However, there is a request to develop more sustainable and ‘green’ processes to overcome the inherent drawbacks. Well-designed cross-linked copolymers were prepared and used as support for the simultaneous immobilization of rhodium and iodide species. The resulting catalyst was proven to be highly active in CH3I-free methanol carbonylation and methyl acetate was the main product. Approximately 90% of methanol was converted after a two-hour reaction time at 120 °C under a CO pressure of 3.0 MPa. The immobilization strategy of the active species works efficiently and the present methanol carbonylation catalyst shows good recyclability. After regenerating the catalyst twice over a fifteen-batches test, the catalyst keeps an acceptable activity. The process based on the present catalyst is evidently a promising sustainable methanol carbonylation.
Co-reporter:Zhijun Huang;Dr. Fengbo Li;Bingfeng Chen ;Tao Lu ;Yin Yuan ; Guoqing Yuan
ChemSusChem 2013 Volume 6( Issue 8) pp:1337-1340
Publication Date(Web):
DOI:10.1002/cssc.201300289
Co-reporter:Feng-Wen Yan, Cun-Yue Guo, Xiao-Hui Zhang and Guo-Qing Yuan
CrystEngComm 2012 vol. 14(Issue 5) pp:1554-1560
Publication Date(Web):14 Dec 2011
DOI:10.1039/C1CE05897E
Sulfonated poly(aspartic acid) (SPASP) of narrow polydispersity was successfully employed in the facile synthesis of porous calcium carbonate microspheres with regular trigonal star-like secondary structure units and significantly improved surface area (56.3 m2 g−1). Based on the CaCO3 particles morphology through different aging times, a mechanism for the formation of porous CaCO3 microspheres with trigonal star-like secondary structures in the presence of SPASP was proposed.
Co-reporter:Feng-Wen Yan, Cun-Yue Guo, Xiao-Hui Zhang and Guo-Qing Yuan
CrystEngComm 2012 vol. 14(Issue 6) pp:2046-2052
Publication Date(Web):12 Jan 2012
DOI:10.1039/C2CE06164C
Using exclusively H2O2 as an additive, facile morphology control over CaCO3 crystal aggregation was realized readily by changing the concentrations of H2O2 and the pH values of the crystallization system. The ionization of H2O2 to [H–O–O]− and [O–O]2− and the generated gas molecules played significant roles in modifying the crystal morphologies. Based on the CaCO3 particles morphology through different aging times, a mechanism about the formation of CaCO3 crystals in the presence of H2O2 was proposed.
Co-reporter:Xiao-Hui Zhang, Feng-Wen Yan, Cun-Yue Guo, Feng-Bo Li, Zhi-Jun Huang and Guo-Qing Yuan
CrystEngComm 2012 vol. 14(Issue 16) pp:5267-5273
Publication Date(Web):14 May 2012
DOI:10.1039/C2CE25538C
Inorganic small molecule H2O2 was utilized as an additive to control the crystallization of BaSO4. The evolution from simple flake-like to pillow morphologies shaped with dominant (hk0) planes and (001) plane was observed by just increasing the pH value and the H2O2 concentration in the reaction solution. Accompanying the change, the hexagonal (001) plane becomes the main face with the side faces transforming into the (210) and (100) faces. The inhibition on the [001] direction results in the appearance of a (001) face and the faster growth in the [010] direction influences the shape of the (001) plane to be hexagonal, elongated along the [010] direction. The crystalline morphologies of urchin-like BaSO4 at different mineralization times were investigated by SEM and a four-step evolution mechanism was proposed. Selective adsorption of HO2− originated from the decomposition of H2O2 over the BaSO4 particles, following gradual O2 evolution, and the formation of BaO2 were considered to be the key factors in the structural evolution. The structural units of urchin-like BaSO4 were strips with hexagonal basal faces, which could be seen as defect-free one-dimensional single crystals. The continuous variation of the morphology captured in this work may provide a deeper understanding of the formation mechanism of one-dimensional barium sulfate fibers. In addition, the results indicate that H2O2 may act as an additive for the crystallization of minerals. Because the final decomposition products are H2O and O2, H2O2 is especially suitable for directing the crystallization demanding high purity of the products.
Co-reporter:Bingfeng Chen, Fengbo Li, Zhijun Huang, Tao Lu, Yin Yuan, Jialu Yu and Guoqing Yuan
RSC Advances 2012 vol. 2(Issue 30) pp:11449-11456
Publication Date(Web):18 Oct 2012
DOI:10.1039/C2RA21858E
Four types of nanostructures were obtained by self-assembly of Ag6[PV3Mo9O40] with N-donor ligands. Monodentate ligands lead to zero-dimensional nanostructures (nanoparticles). Linear didentate bridging ligands result in linear nanorods. Planar didentate chelating ligands develop two-dimensional nanostructures (nanosheets). Nonplanar didentate chelating ligands produce a transition morphology between nanorods and nanosheets. Kinetically driven (Utotal(x) < 0) self-assembly processes lead to structures with less defined shapes. Thermodynamically driven self-assembly (Utotal(x) is close to zero) produces ordered nanostructures. It is demonstrated that these nanocomposites are active catalysts for activating molecular oxygen under mild conditions.
Co-reporter:Xiaohui Zhang, Fengwen Yan, Cunyue Guo, Guoqing Yuan
Materials Letters 2012 80() pp: 117-120
Publication Date(Web):
DOI:10.1016/j.matlet.2012.04.102
Co-reporter:Bingfeng Chen;Dr. Fengbo Li;Zhijun Huang;Fei Xue;Tao Lu;Yin Yuan; Guoqing Yuan
ChemCatChem 2012 Volume 4( Issue 11) pp:1741-1745
Publication Date(Web):
DOI:10.1002/cctc.201200312
Co-reporter:Qingli Qian, Zhijun Huang, Xiaohui Zhang, and Guoqing Yuan
Langmuir 2012 Volume 28(Issue 1) pp:736-740
Publication Date(Web):November 10, 2011
DOI:10.1021/la202619e
Microemulsions are often used in the synthesis of nanoparticles in solution. In this work, we put forward the concept of a “hard microemulsion”, which is based on the differential partitioning of water and ethanol solvent molecules inside functional polymer matrices. When the mixture of water and organic solvent enters the functional polymer, the liquid molecules should partition to different regions. Water should concentrate in the microdomains rich in hydrophilic functional groups, forming water-enriched cores, whereas organic solvents should localize near the alkyl polymer skeleton, forming organic liquid enriched outer layers. From a macroscopic view, the swollen polymer matrix is divided into numerous “microdroplets”, resembling frozen water-in-oil microemulsions. We define such a structure as a “hard microemulsion”. The water-enriched microdroplets may act as templates for synthesizing inorganic nanoparticles. We demonstrate the utility of hard microemulsions for the controllable synthesis of silver and platinum nanoparticles inside different macroreticular functional polymers.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen, Fei Xue, Yin Yuan, Guochang Chen and Guoqing Yuan
Green Chemistry 2011 vol. 13(Issue 12) pp:3414-3422
Publication Date(Web):30 Sep 2011
DOI:10.1039/C1GC15811B
Advanced carbon materials with improved physical properties and tailored surface morphology and chemistry were developed and applied as the support for platinum nanoparticles. The carbon materials are in regular spherical form (around 100 μm) and have a scale-like surface morphology. Platinum nanoparticles of high dispersion was achieved and detailedly characterized by EPMA, TEM, and XPS. The resulting catalysts show high activity for the selective oxidation of glycol, propylene glycol, and glycerol with molecular oxygen as the oxidant. The correlation between catalytic behaviour and the materials' surface properties (active phase dispersion, support surface morphology and chemistry, and bimetallic effect) were further investigated. The recyclability and stability of the catalysts were tested over a five-run recycling experiment. No marked deactivation was observed and the transformation of the dispersion state of platinum nanoparticles during this process was detected by XPS and TEM to address the stabilizing mechanism of the carbon support for platinum nanoparticles.
Co-reporter:Guochang Chen, Cun-Yue Guo, Xiaohui Zhang, Zhijun Huang, Guoqing Yuan
Fuel Processing Technology 2011 Volume 92(Issue 3) pp:456-461
Publication Date(Web):March 2011
DOI:10.1016/j.fuproc.2010.10.012
SBA-15 molecular sieves with a tunable pore size (SBA-15-HCl, SBA-15-HPMo, SBA-15-HPW, and SBA-15-HSiW) were synthesized through adding heteropoly acids to a template and extending crystallization time. Loaded with RhCl3 and Mn(NO3)2, SBA-15-HPMo catalyzed well the direct conversion of syngas to ethanol. In the first 2 h the CO conversion over the Rh–Mn/SBA-15-HPMo catalyst was up to 100%. Average CO conversion over the SBA-15-HPMo-supported catalyst increased significantly from 4.2 to 21.9% and selectivity to ethanol from 9.3 to 12.8% compared with the amorphous silica-supported one. The enhanced redox property of the encapsulated Rh and Mn oxides within the mesoporous channels, and multi-dispersed centers formed by confined metal particles contributed to improved catalytic performances.
Co-reporter:Xiaohui Zhang;Fengwen Yan;Cunyue Guo;Fengbo Li;Guochang Chen;Zhijun Huang
Crystal Research and Technology 2011 Volume 46( Issue 7) pp:664-668
Publication Date(Web):
DOI:10.1002/crat.201100115
Abstract
Crystalline calcium carbonate with randomly dispersed porous structure was prepared through co- crystallization with calcium peroxide and the following template elimination by a post heating treatment and washing with water. The artificial CaCO3 possess abundant macro-mesopores structures and high surface area. This approach may open a new general route for the preparation of crystals with high porosity and structure specialty. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Co-reporter:Guochang Chen;Xiaohui Zhang;Cunyue Guo
Russian Journal of Physical Chemistry A 2010 Volume 84( Issue 13) pp:2247-2253
Publication Date(Web):2010 January
DOI:10.1134/S0036024410130078
Four kinds of mesoporous molecular sieve SBA-15 (SBA-15-HCl, SBA-15-HPMo, SBA-15-HPW, and SBA-15-HSiW) were synthesized by different methods or materials. Loaded with RhCl3 and Fe(NO3)3, the SBA-15-HPMo supported catalyst performed well in catalyzing direct conversion of syngas to ethanol.
Co-reporter:Feng-Wen Yan;Shu-Feng Zhang;Cun-Yue Guo;Xiao-Hui Zhang;Guo-Chang Chen;Fang Yan;Guo-Qing Yuan
Crystal Research and Technology 2009 Volume 44( Issue 7) pp:725-728
Publication Date(Web):
DOI:10.1002/crat.200900190
Abstract
Control over crystal morphology of calcium carbonate (CaCO3) was investigated by simply changing the stirring speeds in the process of CaCO3 formation. Scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) measurements explore the morphology evolution of CaCO3 at varying stirring speeds. As the stirring speeds increase, rhombohedral calcite, spherical vaterite, and monoclinic crystal with coexistence of calcite phase and vaterite phase were formed, suggesting a facile control over calcium carbonate crystallization in constructing crystals with desired morphology. Moreover, almost pure vaterite spherical particles of narrow particle size distribution were formed at optimum stirring speed. Finally, also elucidated in this work is the mechanism investigation into the construction of various crystal forms via this simple route. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Co-reporter:Fengbo Li, Qingli Qian, Fan Yan, Guoqing Yuan
Materials Chemistry and Physics 2008 Volume 107(2–3) pp:310-316
Publication Date(Web):15 February 2008
DOI:10.1016/j.matchemphys.2007.07.017
Monodisperse Rh nanoparticles mounted in the porous carbon microspherules were synthesized through the controlled carbonization of poly(vinylidene chloride) beads containing di-μ-chlorotetracarbonyldirhodium as Rh precursors. Rh nanoparticles were formed spontaneously and simultaneously with the evolution of carbon structures from the composite polymeric precursors. X-ray photoelectron spectroscopy (XPS) was used to detect the transformation of high valent Rh species to zero-valent Rh atoms. The dispersion state and particle size were characterized by EPMA and TEM in detail. The as-synthesized Rh nanoparticles were in the monodisperse state with the particle size of about 10 nm. Under catalytic vapor phase methanol carbonylation conditions, particle growth and redispersion take place through a mechanism involving the formation and transportation of Rh-containing volatile molecules. This is evidenced by the comparison of the dispersion state and particle size of the supported Rh nanoparticles before and after catalyzing vapor phase methanol carbonylation. It is clearly demonstrated that the Rh nanoparticles move to the support's surface and grow to about 30 nm after 50-h reaction on stream.
Co-reporter:Fengbo Li
Angewandte Chemie International Edition 2006 Volume 45(Issue 39) pp:
Publication Date(Web):5 SEP 2006
DOI:10.1002/anie.200600830
Three in one: The oxidation of methane to methyl derivatives, conversion of the methyl derivatives into oxygenated compounds, and regeneration of the oxidation media are the three steps involved in the catalytic partial oxidation of methane by MoO2Br2 supported on Zn-MCM-48 (see scheme). Reversible bromine metathesis between MoO2Br2 and MoO3 is key to the efficient catalytic process.
Co-reporter:Fengbo Li
Angewandte Chemie 2006 Volume 118(Issue 39) pp:
Publication Date(Web):5 SEP 2006
DOI:10.1002/ange.200600830
Drei in einem: Die Oxidation von Methan zu Methylderivaten, deren Umwandlung in oxygenierte Verbindungen und die Regenerierung der Oxidationsmedien sind die drei Schritte bei der katalytischen partiellen Oxidation von Methan durch MoO2Br2 auf einem Zn-MCM-48-Träger (siehe Schema). Die reversible Brommetathese zwischen MoO2Br2 und MoO3 ist entscheidend für eine effiziente Katalyse.
Co-reporter:Fengbo Li and Guoqing Yuan
Chemical Communications 2005 (Issue 17) pp:2238-2240
Publication Date(Web):10 Mar 2005
DOI:10.1039/B500147A
Barium sulfate nanotubes perform excellently in supporting sulfates (Pt(SO4)2, HgSO4, Ce(SO4)2 and Pb(SO4)2) for low temperature catalytic conversion of methane to methanol under strongly acidic conditions in a conventional gas-phase reactor.
Co-reporter:Bingfeng Chen, Fengbo Li, Zhijun Huang, Guoqing Yuan
Journal of Energy Chemistry (September 2016) Volume 25(Issue 5) pp:888-894
Publication Date(Web):1 September 2016
DOI:10.1016/j.jechem.2016.06.007
Furfural is directly converted to levulinate esters (isopropyl levulinate and furan-2-ylmethyl-levulinate) as potential biofuel feedstocks, through a combined catalytic strategy. Nb2O5-ZrO2 mixed oxide microspheres are used as bifunctional catalysts for hydrogen-transfer hydrogenation and acid-catalyzed alcoholysis in isopropanol. Bifunctional catalysts improve sustainability of furfural conversion through process intensification. Hydrogen transfer hydrogenation from isopropanol avoids dangerous hydrogen gas, and abates process and environmental costs. Isopropyl levulinate and furan-2-ylmethyl-levulinate are the main products that can be applied as blending components in biodiesel or hydrocarbon fuels.Furfural is directly converted to levulinate esters in one-pot model. The combined catalysis involves hydrogen-transfer hydrogenation and alcoholysis. Nb2O5-ZrO2 mixed oxide microspheres are used as bifunctional catalysts. Process integration delivers improved sustainability of furfural conversion.Download high-res image (95KB)Download full-size image
Co-reporter:Fengbo Li, Qingli Qian, Shufeng Zhang, Fang Yan, Guoqing Yuan
Journal of Natural Gas Chemistry (December 2007) Volume 16(Issue 4) pp:363-370
Publication Date(Web):1 December 2007
DOI:10.1016/S1003-9953(08)60005-5
Porous silicon carbide/carbon (SiC/C) microspherules were prepared by the controlled heating treatment of polymer and silica hybrid precursors over 1000 °C in Ar/H2 stream. The resultant SiC/C composite shows improved physical properties such as excellent mechanical strength, regular physical form, and high packing density. Such improvement overcomes the main inherent problems encountered when using activated carbons as absorbents without sacrificing porosity properties. N2 sorption analysis shows that the SiC/C composite has a BET surface area of 1793 m2/g and a pore volume of 0.92 ml/g. Methane adsorption isotherm is determined by the conventional volumetric method at 25 °C andupto7.0MPa. On volumetric basis, the SiC/C composite microspherules show methane storage of 145 (V/V) at 3.5 MPa and 25 °C. The combination of excellent physical properties and porosity properties in this SiC/C composite lends a great possibility to develop a competitive storage system for natural gas.
Co-reporter:Bingfeng Chen, Fengbo Li, Zhijun Huang, Guoqing Yuan
Applied Catalysis A: General (5 July 2015) Volume 500() pp:23-29
Publication Date(Web):5 July 2015
DOI:10.1016/j.apcata.2015.05.006
Co-reporter:Bingfeng Chen, Fengbo Li, Zhijun Huang, Tao Lu, Guoqing Yuan
Applied Catalysis A: General (5 July 2014) Volume 481() pp:54-63
Publication Date(Web):5 July 2014
DOI:10.1016/j.apcata.2014.05.001
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen, Fei Xue, Guochang Chen, Guoqing Yuan
Applied Catalysis A: General (22 August 2011) Volume 403(Issues 1–2) pp:104-111
Publication Date(Web):22 August 2011
DOI:10.1016/j.apcata.2011.06.019
Co-reporter:Fengbo Li, Tao Lu, Bingfeng Chen, Zhijun Huang, Guoqing Yuan
Applied Catalysis A: General (20 May 2014) Volume 478() pp:252-258
Publication Date(Web):20 May 2014
DOI:10.1016/j.apcata.2014.04.012
Co-reporter:Fengbo Li, Guoqing Yuan, Fang Yan, Fengwen Yan
Applied Catalysis A: General (1 February 2008) Volume 335(Issue 1) pp:82-87
Publication Date(Web):1 February 2008
DOI:10.1016/j.apcata.2007.11.014
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
Catalysis Science & Technology (2011-Present) 2014 - vol. 4(Issue 12) pp:NaN4264-4264
Publication Date(Web):2014/07/21
DOI:10.1039/C4CY00832D
Nanosheets of graphitic carbon nitride were prepared through direct heat treatment of guanidinium chloride at 450–600 °C in air. The resultant materials had a surface area of 109.9 m2 g−1 and their physicochemical properties were closely related to the condensation temperature. Decomposition of rhodamine (RhB) in aqueous solution was selected as the model reaction to investigate the photocatalytic performance of nanostructured graphitic carbon nitride. The sample with higher surface area exhibited better optical properties and had enhanced photocatalytic activity. These findings suggest that graphitic carbon nitride prepared from guanidinium chloride will be promising for use in pollutants degradation and solar energy utilization.
Co-reporter:Zhijun Huang, Fengbo Li, Bingfeng Chen and Guoqing Yuan
Catalysis Science & Technology (2011-Present) 2016 - vol. 6(Issue 9) pp:NaN2948-2948
Publication Date(Web):2015/11/26
DOI:10.1039/C5CY01805F
Graphitic carbon nitride (g-C3N4) shows great application potential in the activation of CO2 due to its basic surface functionalities and highly specific electronic properties. Herein, to improve its catalytic performance, g-C3N4 was activated by protonation using H2SO4. The texture, surface chemistry and electronic properties of the as-prepared g-C3N4 were then studied. The synthesis of cyclic carbonate from the cycloaddition of CO2 and epoxide was selected as a model reaction to investigate the catalytic performance. The protonated g-C3N4 exhibited a much higher catalytic activity than the pristine g-C3N4. The generation of terminal amino and hydroxyl groups due to the hydrolysis of g-C3N4 under acidic conditions as well as the higher specific surface area are responsible for the enhanced catalytic performance.
![[1,1'-Biphenyl]-4-carboxylic acid, 2-benzoylhydrazide](http://img.cochemist.com/ccimg/101000/100989-00-2.png)
![[1,1'-Biphenyl]-4-carboxylic acid, 2-benzoylhydrazide](http://img.cochemist.com/ccimg/101000/100989-00-2_b.png)
![Tungstate(3-),tetracosa-m-oxododecaoxo[m12-[phosphato(3-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-,hydrogen (1:3)](http://img.cochemist.com/ccimg/1400/1343-93-7.png)
![Tungstate(3-),tetracosa-m-oxododecaoxo[m12-[phosphato(3-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-,hydrogen (1:3)](http://img.cochemist.com/ccimg/1400/1343-93-7_b.png)
