COPPER-ZINC-CHROME-ALUMINIUM CATALYST PRODUCTION METHOD Russian patent published in 2018 - IPC B01J23/80 B01J23/86 B01J23/885 B01J23/04 B01J37/04 C01B3/16 

FIELD: chemistry.

SUBSTANCE: invention can be used for low-temperature methanol synthesis, hydrogenation of nitrobenzene, dehydrogenation of cyclohexanol to cyclohexanone in caprolactam production. A method of producing a copper-zinc-chromium-aluminium catalyst is carried out by mixing a solution of ammonium carbonate complex of copper with zinc and aluminium compounds followed by drying, calcining, and pelletizing the catalyst mass, characterized zinc oxide and powder of aluminium oxide γ-modified with a grinding of less than 100 µm is gradually introduced into the ammonia-carbonate complex solution of copper, the resulting suspension with a ratio of solid: liquid, equal to 1.0:(12.0-15.0) is heated under stirring in the temperature range of 60-90°C to obtain a mass ratio solid: liquid equal to 1.0:(0.01-0.5), then chromic anhydride or an aqueous solution is introduced, the formed chromium-containing mass is homogenized at a temperature in the interval of 70-90°C, dried, calcined at a temperature of generating a catalyst in which chromium is in the oxidation state of Cr³⁺ and Cr⁶⁺, and the content of Cr⁶⁺ and Cr³⁺ is in relation Cr⁶/Cr³⁺, equal to 0.13 and 0.8, preferably 0.39-0.55, and pelletized.

EFFECT: creation of a simple and economical technology for the preparation of a mixed copper-zinc-chromium-aluminium catalyst, which does not have harmful wastewater and gas emissions, and provides a highly active stable catalyst.

2 tbl, 19 ex