| abstract |
(A) obtaining an aqueous mixture solution A containing Mo, V and Sb; (b) a step (b) of obtaining an Nb aqueous solution by mixing Nb raw material, water and an organic acid; and mixing the Nb aqueous solution and the silica raw material (D) a step (d) of mixing the aqueous mixture solution A and the aqueous mixture solution B to obtain an aqueous mixture solution C, (e) a step (e) of drying the aqueous mixture solution C to obtain a dried powder D, And a step (f) of calcining the dry powder (D) to obtain an oxide catalyst. |