Patent ID: 7524792
Filing Date: 2009-04-28
Classification: B01J,C07C

Abstract:
1. A process for the preparation of a catalytically active multimetal oxide comprising material which comprises at least one of the elements Nb and W, and the elements Mo, V and Cu, wherein the molar fraction of the element Mo, based on the total amount of all elements other than oxygen in the catalytically active multimetal oxide comprising material, is from 20 to 80 mol %, wherein the molar ratio of Mo to V, Mo/V, is from 15:1 to 1:1, wherein the corresponding molar ratio Mo/Cu is from 30:1 to 1:3 and the corresponding molar ratio Mo/(total amount of W and Nb) is from 80:1 to 1:4, the process comprising preparing an intimate dry blend comprising ammonium ions from starting compounds that comprise the elemental constituents of the multimetal oxide comprising material, other than oxygen, as components; and thermally treating the intimate dry blend at elevated temperatures in an atmosphere A having a low content of molecular oxygen, so that at least a portion of the ammonium ions contained in the intimate dry blend are decomposed at ≧160° C. with liberation of ammonia, wherein the thermal treatment is carried out as follows: and calcining the intimate dry blend at this increased oxygen content of the atmosphere A in the calcination temperature range.