Catalytic converter

Abstract

A catalytic converter (10) has a carrier (4) with a cell structure, and a precious metal catalyst carried on the carrier. The carrier includes a first carrier (2) and a second carrier (3). The second carrier is provided downstream of the first carrier in a gas flow direction of gas that flows into the catalytic converter. The first carrier has a first peripheral region (2b) and a first center region (2a) that has a lower cell density than the first peripheral region. The second carrier has a second center region (3a) and a second peripheral region (3b) that has a lower cell density than the second center region.

Description

technical field [0001] The invention relates to a catalytic converter arranged in a conduit forming an exhaust system for exhaust gas. Background technique [0002] In various industrial fields, various efforts are being made to reduce environmental impact on a global scale. Among them, in the automobile industry, in addition to the development of gasoline engine vehicles with sufficient fuel efficiency performance, so-called eco-cars (eco-friendly cars) such as hybrid cars and electric cars are also spreading and are being developed to further improve performance of these vehicles. [0003] Typically, a catalytic converter for purifying exhaust gas is arranged in an exhaust system for exhaust gas that connects a vehicle engine to a muffler. [0004] Engines emit harmful substances such as CO, NOx, unburned HC, and volatile organic compounds (VOCs) into the environment. These harmful substances are converted into acceptable substances by passing the exhaust gas through th...

AI Technical Summary

Problems solved by technology

However, if Figure 7 As shown, if the central area of ​​the upstream catalyst where the exhaust gas that has entered the catalytic converter first flows into has a large cell density, the pressure loss with respect to the exhaust gas flow will increase

As a result, for Figure 7 With the catalytic converter shown, the exhaust will not flow easily, so the result may be a reduced inflow of exhaust

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