Automobile exhaust catalyst and prepared catalytic converter thereof

Abstract

The invention provides an automobile exhaust catalyst which comprises a front end carrier and a rear end carrier. The automobile exhaust catalyst is characterized in that the front end carrier is in an oval runway shape, and the mesh number of the carrier is 3 / 600. A front end coating coats the front end carrier, and a single layer of palladium coats the front end coating. The rear end carrier is in an oval runway shape, the mesh number of the carrier is 4 / 400, a rear end coating coats the rear end carrier, and precious metal coats the rear end coating in a partitioned mode. The invention further provides a catalytic converter which is low in initiation temperature, short in initiation time, high in catalytic conversion efficiency, simple in structure, and low in cost. Meanwhile, backpressure loss of the catalytic converter is further reduced, engine power is guaranteed, and reduction of oil consumption of an automobile is facilitated.

Description

technical field [0001] The invention relates to the field of automobile exhaust emission treatment, in particular to an automobile exhaust catalyst and a catalytic converter prepared therefrom. Background technique [0002] With the continuous advancement of the industrialization process, the air pollution in the city is also serious, and affects people's normal life and health. The emission of harmful substances from automobile exhaust has become the main source of urban air pollution, and the installation of a three-way catalytic converter is an internationally recognized and effective technical measure for automobile exhaust purification. It can greatly reduce CO, HC, and NOx emitted by gasoline vehicles. [0003] The three-way catalytic converter (catalytic converter) is mainly composed of a shell, a heat insulating protective cover, a middle section, an inlet and an outlet cone section, an elastic clamping material, and a catalyst for preventing straight-through sealing...

AI Technical Summary

Problems solved by technology

[0004] The original catalytic converter is arranged at the rear end of the exhaust manifold, far away from the exhaust end of the engine, the light-off temperature is relatively low, and the catalytic converter has a long light-off time, which can only meet the National IV emission standard and has a high content of precious metals

In view of the increasingly stringent emission standards and the introduction of the Beijing V emission standards, especially the increase in NMHC emission restrictions, the content of HC and NMHC in the original catalytic converter remained high during the emission calibration, and could not meet the requirements of the National V emission standards.

At the same time, the back pressure of the original catalytic converter is high, which affects the performance of the engine power and increases the fuel consumption of the whole vehicle.

[0005] There are usually three ways to meet the National V emission standards. One is to move the catalytic converter assembly forward to increase the light-off temperature and shorten the light-off time, so as to achieve the purpose of fast operation of the catalytic converter. However, due to the limitation of the vehicle layout space, It cannot be moved forward; the second is to increase the volume of the catalytic converter to increase the reaction area of ​​the catalytic converter, thereby improving the working efficiency of the catalytic converter, but also limited by the layout space of the whole vehicle, the volume of the catalytic converter cannot continue to increase. Runway shape; the third is to increase the content of precious metals, but the cost will increase significantly

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