期刊
CATALYSIS TODAY
卷 118, 期 3-4, 页码 344-352出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2006.07.013
关键词
acrylonitrile; ammoxidation; catalyst; VAlON; oxynitrides; v K-edge X-ray absorption spectroscopy
VAlO(N) oxynitrides are promising novel catalysts for the ammoxidation of propane to acrylonitrile. These catalysts are obtained after nitridation of a VAlO oxide precursor in NH3 or during the reaction in a NH3/C3H8/O-2 mixture. The local structure around the vanadium atoms in the oxide precursor and in several catalysts that have been used in catalytic tests is studied by X-ray absorption spectroscopy (XAS). The nitridation in NH3 was followed with in situ XAS. The oxide precursors have tetrahedral co-ordinated vanadium, while after full nitridation octahedrons are found and a small decrease in vanadium oxidation state occurs. The catalysts used in the ammoxidation reaction consist of a mixture of these tetrahedrons and octahedrons. (c) 2006 Elsevier B.V. All rights reserved.
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