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Direct gas-phase epoxidation of propylene over nanostructured molybdenum oxide film catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
51026 46826 2013 6 PDF Available
Title
Direct gas-phase epoxidation of propylene over nanostructured molybdenum oxide film catalysts
Abstract

Mixed molybdenum oxides are widely used catalysts for propylene oxidation to acrolein or acrylic acid or for methanol oxidation in the gas phase. In the present study, however molybdenum oxides exhibited an epoxidation activity in the gas phase. To achieve this activity, the oxidation state, particle sizes and accessibility of molybdenum oxides are needed to be controlled. Such active molybdenum species can be prepared by PVD deposition of molybdenum nanorods and their subsequent oxidation in a controlled atmosphere. Accordingly, monoclinic MoO2 particles with a diameter of < 10 nm can be prepared, which exhibit 42% selectivity to propylene oxide (the byproducts of the oxidation being mainly acrolein and acetone). In comparison, molybdenum-containing catalysts prepared by traditional impregnation methods exhibited practically zero epoxidation activity in gas-phase epoxidation of propylene.

► It is possible to prepare molybdenum nanorods by a PVD technique. ► A mild oxidation of Mo nanorods results in the creation of monoclinic MoO2 nanodomains. ► MoO2 nanodomains exhibit an epoxidation activity in the gas phase. ► Bulky MoO2 or other molybdenum oxides lack this epoxidation activity.

Keywords
Molybdenum oxides; Nitrous oxide; Propylene oxide; Epoxidation
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Direct gas-phase epoxidation of propylene over nanostructured molybdenum oxide film catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 34, 5 April 2013, Pages 16–21
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