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Preparation method of exhaust gas purifying catalyst containing one or more precious metals

An exhaust gas purification and precious metal technology, which is applied in the field of preparation of exhaust gas purification catalysts, can solve the problems of long preparation period and complex preparation method.

Inactive Publication Date: 2012-09-12
东营信拓汽车消声器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the existing noble metal-containing exhaust gas purification catalysts, which are too complicated and have a long preparation period, and provide a relatively simple and short preparation method for the preparation of noble metal-containing exhaust gas purification catalysts

Method used

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  • Preparation method of exhaust gas purifying catalyst containing one or more precious metals
  • Preparation method of exhaust gas purifying catalyst containing one or more precious metals
  • Preparation method of exhaust gas purifying catalyst containing one or more precious metals

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preparation example Construction

[0010] The preparation method of the waste purification catalyst containing precious metal impregnates a kind of composite alumina with the solution containing noble metal, dries and roasts, obtains the base surface coating material, coats the slurry containing the base surface coating material on a carrier, and dries And roasting, the preparation method of the composite alumina comprises mixing pseudo-boehmite and the aqueous solution of the salt of the auxiliary agent and beating evenly to obtain an alumina content of 10-60% by weight and an auxiliary agent oxide content of 5-40% by weight. % of the first slurry; the pseudo-boehmite and the aqueous solution of the salt of the auxiliary agent are mixed and beaten evenly, and acid is added to adjust the pH value of the slurry to 0.5-5.5, so that the alumina content is 10-60% by weight, and the auxiliary agent is oxidized The second slurry with a substance content of 5-40% by weight; uniformly mix the first slurry and the second...

Embodiment 1

[0023] This example illustrates the preparation of composite alumina.

[0024] 9.47 grams of lanthanum-rich rare earth chloride (equivalent to 4.17 grams of rare earth oxides, based on rare earth oxides, the content of lanthanum oxide is 72.0% by weight, the content of cerium oxide is 1.9% by weight, and the content of rare earth oxides is 26.1% by weight, Produced by Beijing Chemical Plant), 21.65 grams of cerous chloride (equivalent to 10 grams of cerium oxide, produced by Beijing Chemical Plant), 23.55 grams of zirconium oxychloride (containing 38.22% by weight of zirconia, containing 12.74% by weight of yttrium oxide, produced by Beijing Chemical Plant Production) is dissolved in 400 gram dehydrated ions, obtains the aqueous solution of the salt of auxiliary agent. Add 234.375 grams of pseudo-boehmite (the alumina content is 32% by weight, produced by Qilu Catalyst Factory) in the aqueous solution of the salt of the auxiliary agent obtained, and beat at room temperature (a...

Embodiment 2

[0027] This example illustrates the preparation of compliant alumina.

[0028]Prepare composite alumina according to the method of example 1, the difference is that when preparing the first slurry, the beating temperature is 40 ° C, take out the first slurry and adjust the pH value of the slurry with hydrochloric acid and mix the first slurry with the second slurry The temperature is also 40°C to obtain composite alumina A1a. Table 1 shows the specific surface and pore volume of composite alumina A1a. Table 2 gives the composition of A1a.

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Abstract

The invention relates to a preparation method of an exhaust gas purifying catalyst, and especially relates to a preparation method of an exhaust gas purifying catalyst containing one or more precious metals. The provided preparation method has the characteristics of simplicity and short preparation period. The preparation method of composite alumina comprises the following steps: mixing and uniformly beating pseudo-boehmite and an aqueous solution of an assistant salt to obtain a first slurry containing 10-60wt% of alumina and 5-40wt% of an assistant oxide; mixing and uniformly beating pseudo-boehmite and the aqueous solution of the assistant salt, and adding an acid to adjust slurry pH value to 0.5-5.5 to obtain a second slurry containing 10-60wt% of alumina and 5-40wt% of the assistant oxide; and uniformly mixing the first slurry and the second slurry according to a weight ratio of 0.1-10, and drying and roasting the obtained mixed slurry. The preparation method which has the characteristics of simplification and period shortening directly adopts the assistant salt, so the whole preparation process of an assistant hydroxide, a deposition process, and a multitime filtering and washing process are omitted.

Description

technical field [0001] The invention relates to a preparation method of an exhaust gas purification catalyst, in particular to a preparation method of a waste purification catalyst containing precious metals. Background technique [0002] The exhaust gas produced by the engine, such as the exhaust gas of a car, contains a large amount of harmful gases, mainly carbon monoxide (CO) and nitrogen oxides (NO x )composition. With the increasingly stringent requirements on engine exhaust due to environmental protection, the demand for exhaust gas purification catalysts is increasing, and the performance requirements for exhaust gas purification catalysts are also increasing. [0003] The preparation method of exhaust gas purification catalyst usually includes preparing a slurry of base coating material, coating the slurry of base coating material on a honeycomb carrier, drying and calcining. The base coat material generally contains a modified heat-resistant inorganic oxide (such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J21/04B01J35/10B01D53/86B01D53/62B01D53/56B01D53/72
Inventor 延晓峰
Owner 东营信拓汽车消声器有限公司
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