Crystalline MoVO based complex oxides as selective oxidation catalysts of propane |
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| Affiliation: | 1. Instituto de Tecnología Química, UPV-CSIC, Campus de la Universidad Politécnica de Valencia, Valencia, Spain;2. Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid, Spain;1. Inorganic Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;2. Shell Global Solutions International B.V., P.O. Box 38000, 1030 BN Amsterdam, The Netherlands;1. Department of Chemistry, National University of Singapore, 117543, Singapore;2. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;3. National University of Singapore (Suzhou) Research Institute, Suzhou 215123, China;1. College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;2. Key Laboratory of Chemical separation technology of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China;1. Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716, USA;2. Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, Garching, Germany;1. Boreskov Institute of Catalysis SB RAS, Pr. Ak. Lavrentieva, 5, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova, 2, Novosibirsk, 630090, Russia |
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| Abstract: | Three single crystalline Mo VO based oxides, MoVO, MoVTeO and MoVTeNbO, all of which have the same orthorhombic layer-type structure with the particular arrangement of MO6 (M = Mo, V, Nb) octahedra forming slabs with pentagonal, hexagonal, and heptagonal rings in (1 0 0) plane, were synthesized by hydrothermal method and their catalytic performance in the selective oxidation of propane to acrylic acid were compared in order to elucidate the roles of constituent elements and crystal structure in the course of the propane oxidation. It was observed that the rate of propane oxidation was almost the same over all three catalysts, revealing that Mo and V, which were indispensable elements for the structure formation, were responsible for the catalytic activity for propane oxidation. The Te-containing catalysts showed much higher selectivity to acrylic acid than the MoVO catalyst. Since propene was formed as a main product at low conversion levels over every catalyst, it can be concluded that Te located in the central position of the hexagonal ring promoted the conversion of intermediate propene effectively to acrylic acid. The catalyst with Nb occupying the same structural position of V clearly showed the improved selectively to acrylic acid particularly at high conversion region, because the further oxidation of acrylic acid to COx was greatly suppressed. These conclusions were further supported by the additional studies of the determination of activation energy and catalytic oxidations of intermediate products of the propane oxidation. |
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