Importance

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Abstract

A novel catalyst expressed by the formula A.sub.a B.sub.b Ce.sub.c Mo.sub.d P.sub.e O.sub.f wherein A represents at least one element selected from K, R.sub.b, C.sub.s and Tl; B represents at least one element selected from Be, Sr, Zn, Pb, Sb, Bi, Cr, Ag, Ga, Y, Ge, Te, La, Nd and Sm; a, b, c, d, e and f are the number of the atoms of A, B, Ce, Mo, P and O, respectively; and when d is 12, a, b, c and e are independently 0.05 to 12, and f is the number of oxygen atoms which satisfies the valences of the other elements is provided. This catalyst, when used in a reaction for preparing unsaturated carboxylic acids by oxidizing unsaturated aldehydes in the vapor phase, exhibits superior catalytic activity and does not cause reduction in activity by impurities such as olefins.

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First Claim