期刊
JOURNAL OF CATALYSIS
卷 266, 期 1, 页码 64-70出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2009.05.016
关键词
Phosphomolybdic cesium salt; Lanthanum molybdate; Synergetic effect; Heterogeneous catalysis; Isobutane oxidation; Methacrylic acid
Mechanical-phase mixtures of a phosphomolybdic cesium salt containing V and Te as counter-cations and alpha-La2Mo2O9 (LM) or beta-La2Mo1.9V0.1O8.95 (LMV) have been studied as catalysts for the partial oxidation of isobutane into methacrylic acid (MAA) and methacrolein (MA). The catalysts with 50 wt.% of LMV in the phase mixture appeared very efficient at 360 degrees C and atmospheric pressure with selectivity and yield into MAA and MA, respectively, equal to 59% and 12.4%. The characterization of the catalysts allowed to propose that the synergetic effect taking place between the phases results primarily from a support effect of the lanthanum molybdate stabilizing the phosphomolybdic salt and preventing its sintering. The origin of such effect has been related to crystallographic fits between the two phases. This type of structure-related synergetic effect had never been reported in catalytic oxidation reaction for which most of the time, the spreading of one phase on the other is taking place. (C) 2009 Elsevier Inc. All rights reserved.
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