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Gas-phase epoxidation of propylene through radicals generated by silica-supported molybdenum oxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
43820 45990 2007 10 PDF Available
Title
Gas-phase epoxidation of propylene through radicals generated by silica-supported molybdenum oxide
Abstract

It was found that silica-supported molybdenum oxide was high effective for the epoxidation of propylene among various silica-supported metal oxides. The post-catalytic bed volume played an important role in its formation. On a MoOx/SiO2 with 0.255 mmol/g-SiO2, a propylene conversion of 17.6% and a PO selectivity of 43.6% were obtained at 5 atm, 573 K and flow rates of C3H6/O2/He = 10/5/10 cm3 min−1. The characterization studies indicated that crystalline MoO3 nano-particle species was more effective for propylene epoxidation to PO than molecularly dispersed Mo oxide species. The reaction mechanism of propylene epoxidation on MoOx/SiO2 catalysts is hypothesized to involve gas-phase radicals generated at relatively low temperature by the dispersed molybdenum oxide species. These radicals participated in homogeneous reactions with molecular oxygen to produce propylene oxide.

Graphical abstractSilica-supported molybdenum oxide was high effective for the epoxidation of propylene to propylene oxide (PO) using O2 as an oxidant. The post catalytic-bed volume played an important role in PO formation. Crystalline MoO3 nano-particle species was effective for the propylene epoxidation. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Epoxidation; Propylene oxide; Silica-supported molybdenum oxides; Post-catalytic reaction; Radical reaction
First Page Preview
Gas-phase epoxidation of propylene through radicals generated by silica-supported molybdenum oxide
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 316, Issue 2, 10 January 2007, Pages 142–151
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis