Способ производства автомобильного трехмаршрутного катализатора: патент на изобретение

Resultado de pesquisa: Patent

Resumo

FIELD: chemistry. SUBSTANCE: disclosed is a method of producing automotive three-way catalyst. Method comprises steps of preparing an aqueous suspension containing a composition based on cerium and zirconium oxides, aluminium oxide, a modifier salt and a solution of a salt of precious metals; application of suspension onto substrate, drying and annealing. At the stage of preparing an aqueous suspension for grinding powders, compositions based on cerium and zirconium oxides and aluminium oxide are combined. Modifier salt used is barium nitrate or acetate. Addition of modifier to suspension is carried out before addition of precious metals. Addition of modifiers is carried out while stirring and maintaining the pH of the suspension in range of 4 to 7 units. PH is adjusted by adding an acetic acid solution if the pH is greater than 7 units and adding a solution of tetraethylammonium hydroxide in case the pH value is less than 4 units. Precious metals are added to the suspension after holding the suspension with modifier for at least 120 s. EFFECT: invention discloses a method of producing automotive three-way catalyst.
Título traduzido da contribuiçãoMethod for production of automotive three-way catalyst: patent of invention
Idioma originalRussian
Número de patente2738984
IPCF01N 3/20,B01D 53/94
Data da prioridade05/12/2019
Data de arquivo05/12/2019
Estado da publicaçãoPublished - 21 dez 2020

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