Surface-Initiated Gas-Phase Epoxidation of Propylene with Molecular Oxygen by Silica-Supported Molybdenum Oxide: Effects of Addition of C3H8 or NO and Reactor Design |
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| Authors: | Zhaoxia Song Naoki Mimura Susumu Tsubota Tadahiro Fujitani S. Ted Oyama |
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| Affiliation: | (1) Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba Ibaraki, 305-8569, Japan;(2) Environmental Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering (0211), Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| Abstract: | The gas-phase epoxidation of propylene was studied over MoO x /SiO2 catalysts in a reaction system with a post-catalytic bed volume. In the reaction of a mixture of propylene and propane with oxygen below 578 K, propylene oxide (PO) was mainly formed from the oxidation of propylene. It was found that the oxidation reaction was very sensitive to the temperature of the post-catalytic space more than the temperature of the catalyst bed, strongly indicating that radical reactions occurring in the post-catalytic bed free space were responsible for the PO formation. The addition of NO increased propylene conversions and PO selectivity at low conversions, confirming that radical reactions were involved in the propylene reactions. |
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| Keywords: | Epoxidation Silica-supported molybdenum oxides Post-catalytic reaction Radical reaction |
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