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Epoxidation of trans-stilbene and cis-cyclooctene over mesoporous vanadium catalysts: Support composition and pore structure effect

Paper ID Volume ID Publish Year Pages File Format Full-Text
41043 45875 2012 9 PDF Available
Title
Epoxidation of trans-stilbene and cis-cyclooctene over mesoporous vanadium catalysts: Support composition and pore structure effect
Abstract

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 N2-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 VO4 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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (166 K)Download as PowerPoint slideHighlights► Dispersed vanadium active sites were deposited in mesoporous channels. ► Epoxidation of bulky compounds was chemical probed in these catalysts. ► Pore size and structure have significant effect on the catalytic properties. ► V-TUD-1 showed the best performances due to its unique 3D mesostructure. ► Suppressed pore diffusion resistance is suggested to be the main factor.

Keywords
Mesoporous catalysts; Vanadium; Post-synthesis grafting; Epoxidation; Pore size and structure
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Epoxidation of trans-stilbene and cis-cyclooctene over mesoporous vanadium catalysts: Support composition and pore structure effect
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 419–420, 29 March 2012, Pages 194–202
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us