Journal
CATALYSIS COMMUNICATIONS
Volume 34, Issue -, Pages 16-21Publisher
ELSEVIER
DOI: 10.1016/j.catcom.2013.01.006
Keywords
Molybdenum oxides; Nitrous oxide; Propylene oxide; Epoxidation
Categories
Funding
- project NANOBASE [CZ1.07/2.3.00/20.0074]
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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. (C) 2013 Elsevier B.V. All rights reserved.
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