METHOD OF PRODUCING CATALYST AND METHOD OF PRODUCING ACRYLIC ACID Russian patent published in 2024 - IPC B01J37/00 B01J27/53 B01J23/28 B01J23/22 B01J23/72 B01J23/887 C07C57/55 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a catalyst used for the production of unsaturated carboxylic acids, such as acrylic acid and methacrylic acid, by vapor-phase catalytic oxidation of unsaturated aldehydes, such as acrolein and methacrolein. Described is a method of producing a catalyst for synthesis of unsaturated carboxylic acid, wherein the method includes a process of forming a powder containing each catalyst component in order to obtain a catalyst precursor, wherein a sulfur-containing inorganic compound is added to the powder and the powder is subjected to molding, and wherein the powder has a composition represented by the following general formula (1): Mo₁₂V_aX_bCu_cY_dSb_eZ_fSi_gC_hO_i (1), where in formula (1) X denotes Nb and/or W, Y denotes at least one element selected from a group consisting of Mg, Ca, Sr, Ba and Zn, Z denotes at least one element selected from a group consisting of Fe, Co, Ni and Bi, letters from a to i denote the atomic ratio of each element and satisfy the following relationships: 0<a≤12, 0≤b≤12, 0<c≤12, 0≤d≤8, 0≤e≤500, 0≤f≤500, 0≤g≤500, 0≤h≤500, i is a value corresponding to the oxidation state of other elements; and in which the molding process is either a tumbling granulation method, in which powder is deposited on the surface of a substrate and the powder is granulated to obtain a catalyst precursor, or is a tabletting method, in which the initial powder is placed in a mold and pressure is mechanically applied in order to granulate and mold the initial powder to obtain a catalyst precursor. Also described is a method of producing acrylic acid, in which acrolein is oxidised by a vapor-phase catalytic oxidation reaction with an oxygen-containing gas in the presence of a catalyst produced by the method described above.

EFFECT: high degree of conversion of the starting material and selectivity with respect to the product, as well as providing high output of unsaturated carboxylic acid.

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