Patent ID: 8623780

Claim:
A complex oxide catalyst used for acrolein to prepare acrylic acid, having a general formula Mo 12 V a Cu b W c X d Y e O f /Z, wherein X is at least one selected from a group consisting of Nb, Sb, Sr, Ba and Te; Y is at least one selected from a group consisting of La, Ce, Nd, Sm and Cs; “a” is ranging from 2 to 8; “b” is ranging from 1 to 6; “c” is ranging from 0.5 to 5; “d” is ranging from 0.01 to 4; “e” is ranging from 0.01 to 4; f is determined by an oxidation state of the component element; Z is silicon powder, wherein a reducing agent is added during a preparation or a molding process of the catalyst, and the reducing agent is C2˜C6 diol or polyol, wherein a weight of the Z component is 20% to 80% of a weight of the catalyst in a form of powder.