Patent ID: 7214822

Claim:
A process for the gas-phase catalytic oxidation of propane to acrylic acid comprising contacting a gaseous mixture comprising propane and oxygen with a catalyst to hetrogeneously catalyze the oxidation of propane to acrylic acid, wherein the catalyst used is a coated catalyst comprising a support body and a catalytically active oxide composition of the formula I Mo 1 V b M c 1 M d 2 O n (I), where M 1 =Te and/or Sb, M 2 =at least one element selected from the group consisting of Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Ga, Fe, Ru, Co, Rh, Ni, Pd, Pt, Bi, B and Ce, b=0.01 to 1, c=0.01 to 1, d=0.01 to 1 and n=a number required to achieve electrical neutrality and determined by the valence and abundance of the elements other than oxygen in (I), applied as a layer on the surface of the support body, wherein the longitudinal dimension of the support body is from 1 to 10 mm and the thickness of the active oxide composition layer present on the coated catalyst is from 10 to 700 μm.