Catalytic converter

Abstract

Provided is a catalytic converter that makes effective use of all of the constituent catalyst to purify an exhaust gas and minimizes the release of hydrogen sulfide. Said catalytic converter (10) comprises noble-metal catalyst layers (2A, 2B) formed, in the lengthwise direction of a cell-structured substrate (1) through which a gas circulates, on the cell walls of said substrate (1). The substrate (1) comprises a central region (1A) that has a relatively high cell density and a peripheral region (1B) that has a relatively low cell density, and in the lengthwise direction, the catalyst layer (2B) in the peripheral region (1B) is the same length as or shorter than the catalyst layer (2A) in the central region (1A).

Description

technical field [0001] The present invention relates to a catalytic converter accommodated and fixed in a pipe constituting an exhaust system of exhaust gas (exhaust gas). Background technique [0002] In various industries, various efforts to reduce the environmental impact load are being carried out on a global scale. Among them, in the automobile industry, gasoline engine vehicles with excellent fuel economy performance are aimed at so-called hybrid vehicles and electric vehicles. The popularity of eco-friendly vehicles and the development of further performance enhancements are carried out every day. [0003] However, in the exhaust system of the exhaust gas connecting the automobile engine and the muffler, a catalytic converter for purifying the exhaust gas is generally provided. [0004] The engine sometimes emits CO, NO x , unburned HC, VOC and other substances harmful to the environment, in order to convert such harmful substances into acceptable substances, a nobl...

AI Technical Summary

Problems solved by technology

However, this technology has the following problems: Since the cell density of the catalyst as a whole is uniform, it is difficult to expect high exhaust gas purification performance, and when the amount of the noble metal catalyst is increased, it will be difficult to purify exhaust gas. Hydrogen sulfide, which is the cause of bad smell, is produced in a large amount in the process

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