| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing methacrylic acid in a good yield by subjecting methacrolein to vapor phase catalytic oxidation. SOLUTION: In this method for producing methacrylic acid by subjecting methacrolein to vapor phase catalytic oxidation, a catalyst represented by the general formula Moa Pb Vc Cud Sbe Nbf Xg Yh Zi Oj [Mo, P, V, Cu, Sb, Nb and O each represent its element; X is at least one kind of element selected from a group comprising Fe, Co, Ni and Zn; Y is at least one kind of element selected from a group comprising Mg, Ca, Sr, Ba, Ti, Cr, W, Mn, Ag, B, Si, Sn, Pb, As, Bi, In, S, Se, Te, La and Ce; Z is at least one kind of element selected from a group comprising Na, K, Rb, Cs and Tl, with the proviso that (a), (b), (c), (d), (e), (f), (g), (h) and (i) represent atom ratio of specific each element] is used.</p> |
