TY - JOUR
T1 - Epoxidation of trans-stilbene and cis-cyclooctene over mesoporous vanadium catalysts
T2 - Support composition and pore structure effect
AU - Guo, Zhen
AU - Zhou, Chunmei
AU - Hu, Shuangquan
AU - Chen, Yuanting
AU - Jia, Xinli
AU - Lau, Raymond
AU - Yang, Yanhui
PY - 2012/3/29
Y1 - 2012/3/29
N2 - Vanadium supported on mesoporous molecular sieve catalysts with different pore diameters and structures (V-MCM-41, V-SBA-15, and V-TUD-1) were synthesized using a post-synthesis grafting method. The physicochemical properties of these as-calcined mesoporous vanadium catalysts were investigated by several techniques including N 2-physisorption, X-ray diffraction, UV-vis, UV-Raman, and X-ray absorption near-edge structure spectroscopies. The characterization results revealed that the vanadium domains were mainly isolated VO 4 units with a distorted tetrahedral coordination. Epoxidation of trans-stilbene and cis-cyclooctene were carried out to determine the influence of pore size and pore structure on the catalytic activity in a liquid-phase reaction. The best catalytic performance was achieved over the V-TUD-1 catalyst. It was suggested that the unique open 3D sponge-like mesostructure of the TUD-1 support can effectively suppress the pore diffusion resistance on bulky reactants and allow the good accessibility of reactants to the active sites embedded on the pore wall surfaces of mesoporous channels.
AB - Vanadium supported on mesoporous molecular sieve catalysts with different pore diameters and structures (V-MCM-41, V-SBA-15, and V-TUD-1) were synthesized using a post-synthesis grafting method. The physicochemical properties of these as-calcined mesoporous vanadium catalysts were investigated by several techniques including N 2-physisorption, X-ray diffraction, UV-vis, UV-Raman, and X-ray absorption near-edge structure spectroscopies. The characterization results revealed that the vanadium domains were mainly isolated VO 4 units with a distorted tetrahedral coordination. Epoxidation of trans-stilbene and cis-cyclooctene were carried out to determine the influence of pore size and pore structure on the catalytic activity in a liquid-phase reaction. The best catalytic performance was achieved over the V-TUD-1 catalyst. It was suggested that the unique open 3D sponge-like mesostructure of the TUD-1 support can effectively suppress the pore diffusion resistance on bulky reactants and allow the good accessibility of reactants to the active sites embedded on the pore wall surfaces of mesoporous channels.
KW - Epoxidation
KW - Mesoporous catalysts
KW - Pore size and structure
KW - Post-synthesis grafting
KW - Vanadium
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U2 - 10.1016/j.apcata.2012.01.029
DO - 10.1016/j.apcata.2012.01.029
M3 - Article
AN - SCOPUS:84857911173
SN - 0926-860X
VL - 419-420
SP - 194
EP - 202
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -