Cleaning catalyst for automobile exhaust and preparation method of cleaning catalyst carrier

A technology for purifying catalysts and automobile exhaust, which is applied to catalyst carriers, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of weak resistance to thermal aging oxidation, high cost of catalyst production, and complicated production methods. The effect of strong thermal aging resistance, low cost and high activity

Active Publication Date: 2013-04-03
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems of low activity of domestic automobile exhaust purification catalysts, weak resistance to heat aging and oxidation, the use of precious metals such as platinum and rhodium, the high cost of catalyst production, and complicated production methods, the catalyst can achieve better catalytic effects and reach international standards. In order to meet the environmental protection requirements of automobile exhaust emissions, the present invention provides a catalyst for purifying automobile exhaust gas and its preparation method. The catalyst does not use precious metals such as platinum and rhodium, and has low cost, high activity, strong resistance to heat aging and oxidation, and a simple manufacturing process. Features

Method used

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  • Cleaning catalyst for automobile exhaust and preparation method of cleaning catalyst carrier
  • Cleaning catalyst for automobile exhaust and preparation method of cleaning catalyst carrier

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Embodiment 1

[0023] (1) Use hydrogen-oxygen flame to hydrolyze 800g of anhydrous aluminum chloride to prepare pure alumina, dry the obtained pure alumina, grind it, impregnate it in 0.5mol / L barium nitrate solution, filter and dry it after impregnation, and dry it at 1000℃ Heat treatment for 3.5 hours to obtain the treated alumina; (2) The ratio of lanthanum nitrate solution: cerium nitrate solution: praseodymium chloride solution: yttrium nitrate solution is 1mol / L: 1mol / L: 0.5 mol / L: 0.5 mol / L , to prepare a rare earth mixed solution, add citric acid, the weight ratio of the citric acid to the rare earth mixed solution is 1:25, and obtain a precursor solution; add the alumina treated in step (1) into the precursor solution and stir , to obtain a rare earth alumina mixed solution; (3) Add silica fine powder, alumina dispersant polyammonium methacrylate, and binder stearic acid to the rare earth alumina mixed solution to obtain a slurry, in which the silica fine powder The addition amount ...

Embodiment 2

[0025] (1) Prepare pure alumina by hydrolyzing 1000g of anhydrous aluminum chloride with a hydrogen-oxygen flame, dry the obtained pure alumina, grind it, impregnate it in a 1mol / L barium chloride solution, filter and dry it after impregnation, and dry it at 1000°C Heat treatment for 3.5 hours to obtain treated alumina; (2) The ratio of lanthanum nitrate solution: cerium nitrate solution: praseodymium chloride solution: yttrium nitrate solution is 3mol / L: 2mol / L: 1 mol / L: 1mol / L, Prepare a rare earth mixed solution, add complexing agent tartaric acid, the weight ratio of the complexing agent to the rare earth mixed solution is 1:25, and obtain a precursor solution; add the alumina treated in step (1) to the precursor solution (3) Add silica fine powder, alumina dispersant polyethylene glycol, and binder polyacrylate to the rare earth alumina mixed solution to obtain a slurry, in which the silica fine powder The amount of powder added to the mixed solution of rare earth alumina...

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Abstract

The invention provides a cleaning catalyst for automobile exhaust and a preparation method of a cleaning catalyst carrier. The catalyst comprises a carrier, an aid coating coated on the carrier, and an active ingredient loaded on the carrier coating, wherein the active ingredient is a mixed metallic oxide of yttrium, lanthanum, cerium, zirconium, manganese, copper and nickel; the carrier contains alumina and rare-earth lanthanum cerium oxide; and the aid coating is one or several oxides containing lanthanum, cerium, yttrium and zirconium. The preparation method of the carrier comprises the following steps of: hydrolyzing anhydrous aluminum chloride to prepare high-purity alumina, and preparing a saturated solution of lanthanum and cerium nitrate; adding the saturated solution into alumina, stirring, drying, grinding, mixing with graphite and polyethylene glycol, performing mold pressing and roasting. The catalyst has the characteristics that platinum, rhodium and other precious metals are not used, the cost is low, the activity is high, the heat, ageing and oxidization resistance capabilities are high, and the preparation process is simple.

Description

technical field [0001] The invention relates to a vehicle exhaust gas purification catalyst and a preparation method thereof, in particular to a vehicle exhaust gas purification catalyst which does not use precious metals such as platinum and rhodium and a preparation method thereof. Background technique [0002] With the sharp increase in the number of automobiles in our country, the pollution caused by automobile exhaust to the environment is also becoming more and more serious. As early as the 1960s, foreign countries have carried out research and development on automobile pollution control technology, and it has reached the practical stage at present. Existing studies have shown that harmful gases can be purified by improving the performance and production process of the catalyst and its carrier, improving the combustion technology of the automobile internal combustion engine and the exhaust system of the catalyst. Among them, installing a catalytic converter to treat h...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J32/00B01J23/10B01D53/94
Inventor 兰石琨王志坚翁国庆苏正夫杨庆山马小波解焕英于焱
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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