Citation: Martin Šustek, Blažej Horváth, Ivo Vávra, Miroslav Gál, Edmund Dobročka, Milan Hronec. Effects of structures of molybdenum catalysts on selectivity in gas-phase propylene oxidation[J]. Chinese Journal of Catalysis, ;2015, 36(11): 1900-1909. doi: 10.1016/S1872-2067(15)60961-5 shu

Effects of structures of molybdenum catalysts on selectivity in gas-phase propylene oxidation

1.
a Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia;

Corresponding author: Blažej Horváth,
Received Date: 10 June 2015
Available Online: 25 July 2015

Molybdenum-based catalysts for the gas-phase oxidation of propylene with air were investigated. Various types of silica-supported molybdenum oxide and molybdenum-bismuth mixed oxide catalysts were prepared from inorganic and organometallic molybdenum precursors using wet impregnation and physical vapor deposition methods. The epoxidation activities of the prepared catalysts showed direct correlations with their nanostructures, which were identified using transmission electron microscopy. The appearance of a partly or fully crystalline molybdenum oxide phase, which interacted poorly with the silica support, decreased the selectivity for propylene oxide formation to below 10%; non-crystalline octahedrally coordinated molybdenum species anchored on the support gave propylene oxide formations greater than 55%, with 11% propylene conversion. Electrochemical characterization of molybdenum oxides with various morphologies showed the importance of structural defects. Direct promotion by bismuth of the epoxidation reactivities over molybdenum oxides is disputed.
- Propylene oxide,
- Epoxidation,
- Molybdenum oxide,
- Optical property,
- Electrochemical property
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