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A kind of automobile exhaust catalyst and catalytic converter prepared therefrom

A technology of catalysts and catalytic converters, applied in exhaust devices, mechanical equipment, machines/engines, etc., can solve problems affecting engine power, increase catalytic converter reaction area, shorten light-off time, etc., to ensure light-off temperature and light-off time Burn time, improve catalytic conversion efficiency, and high catalytic conversion efficiency

Active Publication Date: 2016-03-02
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A kind of automobile exhaust catalyst and catalytic converter prepared therefrom
  • A kind of automobile exhaust catalyst and catalytic converter prepared therefrom
  • A kind of automobile exhaust catalyst and catalytic converter prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 The impact of carrier mesh number on catalytic converter

[0044] The present invention selects 4.3 / 600, 3.5 / 600, 2.5 / 900 of the front-end carriers respectively, and 6.5 / 400, 5.5 / 350, 4.3 / 400 of the rear-end carriers respectively to detect the influence on the whole catalytic converter.

[0045] The result is as Figure 4a , 4b As shown, the conclusions are as follows:

[0046] 1) According to the above comparison of heat capacity, purification effect and back pressure loss, it can be seen that the parameters of the carrier 2 / 900 are relatively high, but the carrier body wall of the carrier of 2 / 900 is relatively thin, the strength is poor and the cost of the carrier is relatively high High, considering the actual situation of weak domestic packaging capabilities, the front-end carrier is selected as 3 / 600, and the back-end carrier is selected as 4 / 400 considering the contribution of cost and emissions.

[0047] 2) In the present invention, the front-end...

Embodiment 2

[0049] The influence of embodiment 2 coating on whole catalytic converter

[0050] In this example, the front and rear end coatings of three different formulations in Table 1 are selected. Scheme 1 and Scheme 2 respectively use front-end carriers and rear-end carriers with different ratios of precious metals. In addition, the rear-end carrier of Scheme 2 adopts quantitative coating. The back-end carrier of 3 is coated with the partition of the present invention, see Table 1 for details.

[0051] Table 1 Comparison table of coating emission results of different formulations and schemes

[0052]

[0053] According to the emission calibration results of the three schemes in Table 1:

[0054] In view of the high content of HC and NMHC during emission calibration, the front-end carrier of the catalyst is coated with single palladium (Pd) (palladium can mainly promote the oxidation of HC and CO) to remove rhodium (Rh) in the front-end carrier of the original catalyst Metal, rho...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/28
CPCY02A50/20
Inventor 张鹤何延刚朱帅吴梦兵
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD