| 摘要 |
A vanadium-, phosphorus- and oxygen-containing catalyst for the preparation of maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon of at least four carbon atoms has a phosphorus/vanadium ratio of from 0.9 to 1.5, comprises particles having a mean diameter of at least 2 mm and has a composition which, using CuKalpha radiation (lambda=1.54.10-<10 >m), gives a powder X-ray diffraction pattern which, in the 2theta range from 10° to 70°, has a signal/background ratio of <=10 for all diffraction lines which are attributable to a vanadium- and phosphorus-containing phase. Said catalyst is prepared and is used for the preparation of maleic anhydride.
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