| 摘要 |
A catalyst for the vapor-phase oxidation of an unsaturated hydrocarbon, alcohol, saturated aliphatic aldehyde or unsaturated aliphatic aldehyde having 4 carbon atoms, said catalyst comprising a molybdovanadophosphoric acid having X-ray diffraction lines (Cu-K alpha radiation) at 2 theta =about 26.2 DEG , about 10.5 DEG , about 21.3 DEG and about 30.3 DEG and a crystal structure approximating that of its salt, and said catalyst having the composition represented by the general formula PaMobVcXdYeOf wherein the dissociable protons of the molybdovanadophosphoric acid are omitted, X represents at least one element selected from the group consisting of sodium, potassium, rubidium, cesium, thallium, beryllium, magnesium, calcium, strontium, and barium, Y represents at least one element selected from the group consisting of copper, silver, arsenic, antimony, tellurium, cobalt, bismuth and zirconium, and the subscripts a to f represent the atomic proportions of the respective elements, provided that when b is 12, a is 0.1-3.0, c is 0-6.0 (exclusive of 0), d is 0-10.0, e is 0-5.0, and f is a value determined by the atomic valences and atomic proportions of the respective elements.
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