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Natural gas vehicle tail gas purification catalyst and preparation method thereof

A technology for exhaust gas purification and catalyst, which is used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of high cost of noble metal catalysts and small specific surface area of ​​perovskite catalysts, and achieve excellent performance. The effect of exhaust gas conversion efficiency, reduction of fluctuation range and improvement of activity

Pending Publication Date: 2022-08-09
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of small specific surface area of ​​perovskite catalysts and high cost of noble metal catalysts in the prior art, and provide a catalyst for purification of exhaust gas from natural gas vehicles and its preparation method

Method used

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  • Natural gas vehicle tail gas purification catalyst and preparation method thereof
  • Natural gas vehicle tail gas purification catalyst and preparation method thereof
  • Natural gas vehicle tail gas purification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0048] like figure 1 As shown, a natural gas vehicle exhaust gas purification catalyst includes a catalyst carrier 1 and a first coating 2, a second coating 3, and a third coating 4 coated on the catalyst carrier 1, wherein the coating adopts a segmented coating Covered on the catalyst carrier 1, the first coating 2 is located in the front section, the second coating 3 is located in the middle section, and the third coating 4 is located in the rear section, the front section is the part of the catalyst coating near the intake end 5, and the rear section is the catalyst The part of the coating near the gas outlet 6, the middle section is located between the front section and the rear end; the coating length of the first coating 2, the second coating 3, and the third coating 4 is 1 / 3, 1 of the carrier 1 / 3, 1 / 3; the catalyst carrier is a cordierite carrier, and the preparation method of the catalyst is as follows figure 2 shown, the specific steps are:

[0049] Step S1, respe...

Embodiment 2

[0055] This embodiment is similar to Embodiment 1, except that the second coating layer 3 is located in the front section, the first coating layer 2 is located in the middle section, and the third coating layer 4 is located in the rear section, such as image 3 shown.

[0056] According to the preparation method of Example 1, the catalyst S2 of this example was obtained.

Embodiment 3

[0058] This embodiment is similar to Embodiment 1, except that the second coating layer 3 is located in the front section, the third coating layer 4 is located in the middle section, and the first coating layer 2 is located in the rear section, such as Figure 4 shown.

[0059]According to the preparation method of Example 1, the catalyst S3 of this example was obtained.

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Abstract

The invention discloses a natural gas vehicle tail gas purification catalyst and a preparation method thereof, the catalyst comprises a catalyst carrier, a first coating, a second coating and a third coating, the first coating, the second coating and the third coating are coated in a segmented and / or layered mode, and the first coating is formed by loading LaxAyMnzB1-zO3 perovskite type composite oxide on aluminum oxide or first modified aluminum oxide with the specific surface area not smaller than 150 m < 2 > / g; the second coating is formed by loading precious metal Pt and / or Pd on cerium-zirconium composite oxide and / or second modified aluminum oxide; the third coating is noble metal Pt, Rh or Pd, and Rh is loaded on the cerium-zirconium composite oxide and / or the third modified aluminum oxide; the second coating is arranged at the front end or the lower layer of the third coating. The first coating of the catalyst can give full play to the oxygen storage and release functions and the catalytic function of perovskite, part of pollutants are converted, fluctuation of the air-fuel ratio is adjusted at the same time, after the first coating is used in cooperation with oxidation type and reduction type catalysts, the activity of the catalyst can be improved, pollutant emission is reduced, and therefore the use amount of precious metal is reduced, and cost is saved.

Description

technical field [0001] The invention relates to the technical field of vehicle exhaust gas purification, in particular to a natural gas vehicle exhaust gas purification catalyst and a preparation method thereof. Background technique [0002] Natural gas vehicles are gradually being widely used because they are considered to be "clean fuel". At present, my country's natural gas vehicle emission standards have been implemented to the sixth stage. Compared with the national five, the emission limits of various pollutants have been further reduced, the endurance mileage has been increased, and the by-product NH has been stipulated. 3 emission value. Since the exhaust temperature of natural gas vehicles is much lower than that of gasoline vehicles, in addition to CH 4 The C-H bond in the molecule has high energy and is difficult to break. In addition, the three-effect window is rich and narrow, and the air-fuel ratio fluctuates greatly. Usually, a higher content of precious met...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/02B01J35/10B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01J23/8986B01J37/0201B01J37/0244B01J37/0228B01D53/945B01D2258/018B01D2255/9025B01D2255/9035B01J35/615Y02T10/12Y02A50/20
Inventor 成天琼程永香王云李大成王金凤杜洪仪祖光发全宗杰刘志昆刘芳张子瞻
Owner SINOCAT ENVIRONMENTAL TECH