A kind of automobile three-way catalytic converter catalyst

Abstract

The present invention discloses an automobile three-way catalytic converter catalyst comprising a honeycomb support. The automobile three-way catalytic converter catalyst is characterized in that the front half section of the honerycomb support is loaded with a coating with a mass ratio of Pd to Rh being 1:(1-5); the rear half section of the honeycomb support is loaded with a coating with a mass ratio of Pt to Pd being 1:(1-5) as a lower coating; and an upper coating with a mass ratio of Pd to Rh being 1:(2-8) is attached to the lower coating. The catalyst is in a coating structure that the lower layer is subjected to twice subsection attaching, the upper layer is subjected to one attaching, Pt , Pd and Rh are respectively attached onto different areas according to a certain ratio with reasonable control, selective catalytic conversion function is achieved, and combination of different coatings of rare earth and transition metal complex oxides is matched, so that the oxygen storage capacity is met, the high activity of catalytic reduction on oxynitrides and the high temperature aging capacity of active components of noble metals are ensured.

Description

technical field [0001] The invention relates to the technical field of automobile three-way catalytic converters, in particular to an automobile three-way catalytic converter catalyst. Background technique [0002] With the development of society, the advancement of science and technology, and the continuous improvement of people's living standards, automobiles have become the mainstream means of transportation and are widely used. However, with the increase in the number of cars, the air pollution caused by car exhaust has become more and more serious, and it has become one of the main pollution sources in large cities. The main pollutants in car exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen. Oxygen compounds (NOx), in which carbon monoxide enters the blood circulation through the respiratory tract, and forms carboxyhemoglobin after binding with hemoglobin, thereby weakening the function of blood to transport oxygen to various tissues, harming the central...

AI Technical Summary

Problems solved by technology

However, with the increase of the number of automobiles, the air pollution caused by automobile exhaust has become increasingly serious, and has become one of the main sources of pollution in large cities. The main pollutants in automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen Oxygen compounds (NOx), in which carbon monoxide enters the blood circulation through the respiratory tract, and forms carboxyhemoglobin after affinity with hemoglobin, thereby weakening the function of blood to transport oxygen to various tissues, endangering the central nervous system, and causing people's feelings, reactions, understanding, and memory. In severe cases, it will endanger the blood circulation system and cause life-threatening