Catalyst for preparing acrylic acid by acrolein oxidation and preparation method thereof

The invention relates to a catalyst for preparing acrylic acid by acrolein oxidation and a preparation method thereof, and mainly solves the problems of low selectivity and low yield of reaction product acrylic acid in the prior art. Through use of a technical scheme of the catalyst and the preparation method thereof, the problems are well solved, and the catalyst and the preparation method thereof can be used in industrial production of the acrylic acid prepared by acrolein oxidation. The technical scheme is shown as follows: at least one substance selected from SiO2, Al2O3 or TiO2 is used as a carrier; the catalyst contains an active component represented by the following general formula: Mo[12]V[a]X[b]Y[c]Z[d]Q[e]O[x], wherein X is at least one selected from the group consisting of W, Cr and Nb, Y is at least one selected from the group consisting of Cu, Fe, Ni, Co and Mn, Z is at least one selected from the group consisting of Sb and Bi, and Q is at least one selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca and Sr; and in the preparation process of the catalyst, an inorganic alkali is added.