EXHAUST GAS CLEANING CATALYST AND METHOD OF ITS PRODUCTION Russian patent published in 2014 - IPC B01J23/38 B01J21/06 B01J23/63 B01J35/10 B01J37/02 B01D53/94 F01N3/10 

FIELD: engines and pumps.

SUBSTANCE: invention relates to exhaust gas cleaning catalyst, method of its production and exhaust gas cleaner. Proposed catalyst comprises crystalline metal oxide carrier and noble metal particle secured thereat. Said noble metal particle is epitaxy-grown at said carrier. Said noble metal particle is dispersed and secured at carrier inner and outer surfaces, mainly, hemispherical. Width (W) of contact section between said carrier and said particle and height (H) of said particle from said particle surface satisfy the following formula (1): $$W/H>\mathrm{1,0.}$$ Said height (H) of said particle from carrier surface makes 0.5 nm or larger. Noble metal particle diameter measured by carbon monoxide process makes 0.5-10 nm. Production of said catalyst comprises the steps that follow. 1) Masking of at least a portion of crystalline metal oxide carrier in solution by masking agent and dipping said carrier in solution bearing noble metal. 2) Drying and annealing of said carrier and said solution with noble metal to secure said noble metal at said carrier.

EFFECT: suppression of noble metal particle grain growth.

20 cl, 26 dwg, 2 tbl, 4 ex