Catalysis by 12-molybdophosphates. 1. Catalytic reactivity of 12-molybdophosphoric acid related to its thermal behavior investigated through IR, Raman, polarographic, and X-ray diffraction studies : A comparison with 12-molybdosilicic acid
Catalysis by 12-molybdophosphates. 1. Catalytic reactivity of 12-molybdophosphoric acid related to its thermal behavior investigated through IR, Raman, polarographic, and X-ray diffraction studies : A comparison with 12-molybdosilicic acid
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DOI：
10.1006/jcat.1996.0358
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发表时间：
1996-11
影响因子：
7.3
通讯作者：
C. Rocchiccioli-deltcheff;A. Aouissi;M. Bettahar;S. Launay;M. Fournier
中科院分区：
文献类型：
--
作者：
C. Rocchiccioli-deltcheff;A. Aouissi;M. Bettahar;S. Launay;M. Fournier
用红外光谱、拉曼光谱、极谱法、X射线衍射和催化甲醇氧化反应等联用技术研究了12-溴代磷酸（PMo{sub 12}H）的热行为，并与12-溴代磷酸的结果进行了比较。PMo{sub 12}H的分解在很宽的温度范围内发生，导致{beta}-和{alpha}-MoO{sub 3}的混合物。P和Si化合物之间的一个很大的相似性被证明在分解范围之外。在此范围内的差异（宽的P，窄的Si化合物）进行了讨论，在分解动力学，纹理的演变，并重建Keggin单元的能力。参考文献20篇，图12，2个标签。
The thermal behavior of 12-molybdophosphoric acid (PMo{sub 12}H) was investigated using coupled techniques (IR and Raman spectroscopies, polarography, X-ray diffraction, and catalytic reactivity in methanol oxidation) and compared with results obtained with 12-molybdosilicic acid. The decomposition of PMo{sub 12}H occurs in a wide temperature range, leading to mixtures of {beta}- and {alpha}-MoO{sub 3}. A great analogy between the P and Si compounds is evidenced outside the decomposition range. The differences inside this range (wide for P, narrow for Si compound) are discussed in terms of kinetics of decomposition, textural evolution, and capability to rebuild the Keggin unit. 20 refs., 12 figs., 2 tabs.