A low reaction temperature, low-deterioration wire mesh catalyst manufacturing process

A reaction temperature, wire mesh technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high reaction temperature and low reaction temperature. Fast and other problems, to achieve the effect of reducing the reaction working temperature, reducing the specific surface area, and reducing the deterioration coefficient

Active Publication Date: 2021-09-21
南京德普瑞克环保科技股份公司
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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 solve the defects of high reaction temperature and fast deterioration speed in the prior art, and provide a low reaction temperature and low deterioration wire mesh catalytic converter manufacturing process

Method used

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  • A low reaction temperature, low-deterioration wire mesh catalyst manufacturing process
  • A low reaction temperature, low-deterioration wire mesh catalyst manufacturing process
  • A low reaction temperature, low-deterioration wire mesh catalyst manufacturing process

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Effect test

Embodiment 1

[0014] 1. The size of the wire mesh carrier is 34*30*10, the mass ratio of the precious metal is Pt:Pd:Rh=0:20:1, and the mass concentration of the precious metal coating solution is 50g / ft 3 ;

[0015] 2. Dilute the above precious metal coating solution to 30g / ft 3 , added to the coating to form a slurry, wherein the composition of the coating is alumina powder, cerium-zirconium, precious metals, and adhesives. The precious metal accounts for 0.01% of the total mass of the slurry, and then evenly coated on the wire mesh for normal After drying, roast at 550±50°C and cool naturally for use;

[0016] 3. The semi-finished wire mesh catalytic converter after cooling is subjected to pre-aging treatment at 950±50°C for 4 hours, and then cooled naturally for use;

[0017] 4. Dilute the precious metal coating solution in step 1 to 20g / ft 3 Precious metal solution, forming a surface layer coating liquid, stand-by, wherein the mass ratio of the amount of precious metal contained in ...

Embodiment 2

[0020] The method used in Example 2 is similar to that of Example 1, except that the mass ratio of the amount of noble metal contained in the surface coating liquid in step 4 to the amount of noble metal contained in the slurry in step 2 is 2:8.

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Abstract

The invention relates to the technical field of catalysts, and relates to a manufacturing process of a low-reaction temperature and low-deterioration wire mesh catalytic converter. The first step of the manufacturing process is to coat a coating slurry containing a precious metal solution with a content of 60% to 80%, and then to bake the catalyst. Dry roasting and pre-aging treatment; the second step is to coat the remaining 20% ​​to 40% of the precious metal solution on the surface coating of the produced semi-finished wire mesh catalyst. Beneficial effects: the forcible intervention destroys the microporous unstable structure of the coating, correspondingly reduces the specific surface area, reduces the initial conversion rate, reduces the reaction working temperature, and reduces the risk of being scalded by the plastic cover. At the same time, the high-temperature pre-aging catalyst has been carried out, and the unstable structure of the coating has been treated, and the deterioration coefficient will be correspondingly reduced after normal use; finally, coating the precious metal solution on the structurally stable coating can make up for the decrease in the specific surface area after pre-aging. The risk of reduced conversion efficiency, so as to ensure that the product meets the requirements of emission regulations.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a manufacturing process of a low-reaction temperature and low-deterioration wire mesh catalytic converter. Background technique [0002] Gasoline engine small garden tools generally refer to power garden care tools that use gasoline as fuel. The annual production and sales of small garden tools in my country have reached 17 million units. This garden tool is small in size, light in weight and easy to operate, but at the same time the muffler structure is small. [0003] With the implementation of my country's non-road national second emissions, the exhaust emissions from gasoline engine garden tools cannot meet the emission requirements, and a catalytic converter must be added to catalyze the exhaust gas. Due to the small structure of the muffler and the complicated internal structure of the muffler, the general catalytic converter is very difficult. Difficult to in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/02B01J37/08
CPCB01J37/0225B01J37/08
Inventor 李纪委杨亚娟
Owner 南京德普瑞克环保科技股份公司
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