期刊
APPLIED CATALYSIS A-GENERAL
卷 474, 期 -, 页码 18-25出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2013.07.039
关键词
Senarmontite; Magneto hydrodynamic (MDH) synthesis; Mo-V-Sb mixed oxide; Isobutane partial oxidation; Methacrolein
资金
- Institute for the Promotion of Innovation through Science and Technology in Flanders (IWT-Vlaanderen)
A peculiar effect was observed that the oxidation behavior of antimony oxide prepared in presence of a weak permanent magnetic field is changed. Reactivity of alpha-Sb2O3 (senarmontite) toward oxidation is significantly enhanced after recirculating its suspension in a magneto hydrodynamic (MHD) system. This inspired the MHD synthesis of a molybdenum-vanadium-antimony mixed oxide with superior catalytic activity for selective partial oxidation of isobutane. Traditionally these mixed oxides are synthesized via sol-gel processes involving complexing agents and/or costly alkoxides. Here a new convenient way is presented to synthesize Mo-V-Sb mixed oxide catalysts departing from senarmontite (alpha-Sb2O3), ammonium heptamolybdate and ammonium vanadate. The MHD treated mixed oxide prepared from suspensions of Sb2O3 with Mo and V salts was evaluated in isobutane partial oxidation and compared with conventionally prepared catalysts. Improved performance was observed for MHD catalysts, with a peak methacrolein selectivity of 40% and decreased CO chi selectivity as compared to a reference 'slurry-type' catalyst. Although the MHD synthesis mechanism cannot yet be explained on a molecular level, it represents significant scientific and economical potential. This report is intended as an invitation to assist in formulating a molecular mechanism capable of explaining these observations. (C) 2013 Elsevier B.V. All rights reserved.
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