Three-way catalyst

Abstract

The invention belongs to the technical field of catalyst preparation, and particularly discloses a three-way catalyst. The three-way catalyst includes a filter element, a shell and ventilation pipes;the ventilation pipes are installed on both sides of the shell for inputting and exhausting exhaust gas; the shell is in hollow design; the filter element is installed in an inner cavity of the shell;the filter element is provided with uniformly distributed catalytic holes; the catalytic holes are in spiral channel design; a circulation pipe is fixedly connected to the bottom of the shell; the circulation pipe is in hollow design and the circulation pipe communicates with the inner cavity of the shell; in an initial state, a plurality of cleaning balls are carried in the circulation pipe; thesurface of the cleaning balls are uneven; a filter screen is fixedly connected between the shell and the ventilation tube on the right side; inner cavities of the cleaning balls are filled with lightinert gas; and the cleaning balls are made of a high-temperature-resistant elastic rubber material. The cleaning balls are driven to circulate in the catalytic holes and the circulation pipe by the impact force of the air flow so as to clean up carbon fume attached to the surface of the catalytic holes, and the orderly progress of the catalytic reaction is ensured.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a three-way catalyst. Background technique [0002] The main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). The catalyst installed in the exhaust system can oxidize carbon monoxide and hydrocarbons into carbon dioxide (CO2), water ( H2O), and at the same time reduce the nitrogen oxides to nitrogen (N2) to purify the exhaust gas. This catalyst is usually called a three-way catalyst. The three-way catalyst consists of two parts: a honeycomb ceramic or metal carrier, and a catalyst coating attached to the carrier. The catalyst coating is usually composed of an oxide material (such as alumina) with a large specific surface area, an oxygen storage material, and a noble metal active component (usually Pd (palladium), Rh (rhodium) dispersed on the surface of the oxide or oxygen storage material. one or more of them)...

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Problems solved by technology

[0004] In order to make up for the deficiencies of the prior art and solve the problem that the surface of the catalyst is very easy to adsorb oxides and soot when the catalytic converter is in use, which reduces the efficiency of the catalytic converter, a three-way catalyst proposed by the present invention

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