Preparation of organic acids such as acrylic acid by catalytic oxidation using a group V mixed metal oxide catalyst containing Cu, Mo, W, V, Nb and Ta

摘要

Multimetal oxide materials containing molybdenum, vanadium, copper and one or more of the elements tungsten, niobium, tantalum, chromium and cerium and having a multiphase structure, and their use for the preparation of acrylic acid from acrolein by gas-phase catalytic oxidation, and oxometallates of the HT Cu molybdate structure type which contain Cu, Mo and at least one of the elements W, V, Nb and Ta.