Mixed metal oxide catalyst doped by vapor depositing a metal and mixed metal oxide catalyst prepared by depositing a plurality of films of different elements using physical vapor deposition

摘要

A catalyst comprising a mixed metal oxide is useful for the vapor phase oxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated nitrile. The catalyst is prepared by vapor depositing a dopant metal, preferably Au and Pd, on a mixed metal oxide catalyst. Alternatively, the catalyst is prepared by subsequently depositing a plurality of films of different elements, e.g. Mo, V, Te and Nb, and then calcining said plurality of films.