METHOD OF BIMETALLIC PALLADIUM-RHODIUM CATALYSTS PREPARATION (VERSIONS) Russian patent published in 2021 - IPC B01J31/22 B01J23/44 B01J23/46 B01J37/02 B01J37/08 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to methods (versions) of producing catalyst compositions used as three-route catalyzers for neutralizing automotive exhaust gases. First invention relates to a method of producing bimetallic palladium-rhodium catalysts, involving the step of applying complex salts on the substrate, drying the semi-product and subsequent annealing, wherein the step of applying complex salts is the application of double complex salts with formula [M₁L₁]_x[M₂L₂]_yX_z, where M₁ and M₂ = Rh or Pd, L₁ = ethylene diamine or ammonia, L₂ = C₂O₄²⁻, X = counter ions, x, y and z are stoichiometric coefficients. Second invention relates to a method of producing bimetallic palladium-rhodium catalysts, wherein the step of applying complex salts involves the following process steps: application of compound of type [M₁L₁]_x X_y, where M₁ = Rh or Pd, L₁ = ethylene diamine or ammonia, X = counter ions, x and y—stoichiometric coefficients, drying in air at room temperature for 8–20 hours, then in drying cabinet in air at temperature 70–95 °C for 3–9 hours, application of compound of type X_y[M₂ L₂]_x, where M₂ = Rh or Pd, L₂= C₂O₄²⁻, X = counterions, x and y are stoichiometric coefficients.

EFFECT: technical result consists in production of bimetallic palladium-rhodium catalysts with high catalytic activity with reduction of energy consumption and quantity of process solutions for recycling.

6 cl, 1 dwg, 9 ex