FIELD: chemistry.
SUBSTANCE: disclosed is a method of producing an oxide catalyst for gas-phase contact ammoxidation containing Mo, V, Sb and Nb and having a compound represented by following formula (1): MoVaSbbNbcZdOn, in which Z denotes at least one element selected from a group consisting of W, La, Ce, Yb and Y; values of a, b, c, and d lie in intervals of 0.01 ≤ a ≤ 0.35, 0.01 ≤ b ≤ 0.35, 0.01 ≤ c ≤0.20, and 0.00 ≤ d ≤ 0.10, respectively; and n is a number which satisfies the balance of atomic valences, the method comprising: a step of preparing the raw material, on which a liquid aqueous mixture containing Mo, V, Sb and Nb is obtained; - aging stage, at which liquid aqueous mixture is exposed to standing or mixing for a period of time greater than or equal to 5 minutes and less than or equal to 50 hours, wherein each of said actions is carried out at temperature higher than 30 °C; drying step whereon the liquid aqueous mixture is dried to obtain dry powder; and a burning step, on which dry powder is burnt, thereby obtaining an oxide catalyst, wherein at the step of preparing the material and/or the aging step, Nb deposition is facilitated by carrying out at least one operation selected from the group consisting of the following operations (I) and (III): (I) at the stage of raw material preparation, a liquid aqueous mixture is prepared by mixing a first liquid feed material containing Nb and water with a second liquid starting material containing Mo, V and Sb and water, wherein at least one material from said first liquid starting material, said second liquid starting material and liquid aqueous mixture is added with ammonia in an amount to set molar ratio NH3/Nb in liquid aqueous mixture greater than or equal to 0.7, and at aging stage temperature of liquid aqueous mixture is set higher than 50 °C; (III) at the stage of preparing the raw material, the liquid aqueous mixture is prepared by mixing said first liquid starting material with said second liquid starting material, wherein molar ratio H2O2/Nb in said first liquid starting material is set lower than 0.2, and at aging stage temperature of liquid aqueous mixture is set higher than 50 °C.
EFFECT: technical result is the development of a method of producing an oxide catalyst in a short period of time, providing high output of the unsaturated nitrile without introducing complex steps and changing equipment.
3 cl, 1 tbl, 18 ex
