A Study on Mixed Vanadium Catalysts for the Ammoxidation of Xylene

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Abstract
The phase composition and the physicochemical properties of an antimony-vanadium catalyst and a chromium-vanadium catalyst for the ammoxidation of xylene were studied by X-ray diffraction method, differential thermal analysis, infrared absorption analysis and ESR measurement. An antimony-vanadium catalyst consisted essentially of SbVO4 which contained no double covalent bond V=O, while a chromium-vanadium catalyst consisted essentially of a chemical compound which was different from CrVO4. SbVO4 and CrVO4 were hard to be reduced with ammonia at 400°C, while a chemical compound in the chromium-vanadium system was reducible. The activity and the selectivity of reaction were affected by the nature and the distribution of metal ions and oxygen ion on surface.

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