| 摘要 |
A method for producing a complex oxide catalyst containing a complex oxide represented by the formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒMo 1 V a Sb b Nb c W d Z e O n
(wherein a component Z represents an element such as La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; a, b, c, d, e, and n each represent an atomic ratio of an element to one Mo atom; 0.1 ‰¤ a ‰¤ 0.4, 0.1 ‰¤ b ‰¤ 0.4, 0.01 ‰¤ c ‰¤ 0.3, 0 ‰¤ d ‰¤ 0.2, and 0 ‰¤ e ‰¤ 0.1; an atomic ratio a/b is 0.85 ‰¤ a/b < 1.0, and an atomic ratio a/c is 1.4 < a/c < 2.3.), the method including: a step of preparing a specific raw material-formulated solution containing Mo, V, Sb, Nb, W, and Z; a step of drying the raw material-formulated solution to obtain a dry powder; a step of pre-stage calcining the dry powder to obtain a pre-stage calcined product; a step of main-calcining the pre-stage calcined product to obtain a calcined product having a protrusion on the surface of the particle; and a step of removing the protrusion by an air stream, wherein the reduction rate of the pre-stage calcined product is 8 to 12%, and the specific surface area of the calcined product is 7 to 20 m 2 /g. |
