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Catalytic epoxidation of propylene with CO/O2 over Au/TiO2☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
39779 45835 2014 7 PDF Available
Title
Catalytic epoxidation of propylene with CO/O2 over Au/TiO2☆
Abstract

•Propylene undergoes gas-phase selective epoxidation with CO/O2 reactants over Au/TiO2.•The reaction is analogous to the known epoxidation of propylene with H2/O2 mixture.•Either CO and H2 are the necessary reducing co-reagents to perform the reaction.•CO and H2 induce a formation of the same active oxygen species.

Gold nanoparticles supported on TiO2 are known to catalyze vapor-phase epoxidation of propylene with molecular oxygen in the presence of H2 as the necessary reducing co reagent. Here, we report that carbon monoxide can be employed instead of hydrogen to accomplish similar reaction. The reaction of propylene, CO and O2 can be carried out in a flow reactor over Au/TiO2 at a temperature of 40–90 °C. The propylene oxide selectivity attains 80–97% at propylene conversion of 1.7–3.7%. The propylene oxide yield goes through the maximum as a function of reaction time, the maximal value being twice higher compared to yield of propylene oxide achieved by “traditional” reaction with H2/O2 mixture. Utilization efficiency of CO reaches 25%, which is comparable to that of H2 in the analogous reaction of propylene, H2 and O2. Proposed mechanism for the reaction involves the formation of specific oxygen species arising from O2 on catalytic sites reduced with CO. This is in line with generation of highly reactive oxygen species (detectable by oxygen isotopic exchange) on Au/TiO2 surface treated preliminarily with CO.

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Keywords
Gold catalysts; Au/TiO2; Propylene epoxidation; Propylene oxide; CO/O2
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Catalytic epoxidation of propylene with CO/O2 over Au/TiO2☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 476, 22 April 2014, Pages 197–203
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