Multi-metal-CHA type molecular sieve catalyst as well as preparation method and application thereof

A molecular sieve and catalyst technology, applied in the field of multi-metal-CHA molecular sieve catalyst and its preparation, can solve the problems of active metal migration, product appearance, fresh activity, hydrothermal stability, etc., to achieve hydrothermal stability improvement and low price Inexpensive, the effect of reducing manufacturing costs

Active Publication Date: 2020-05-29
稀土催化创新研究院(东营)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst prepared by this method will have active metal migration during the calcination process, which will have a certain impact on the appearance, freshness, activity, and hydrothermal stability of the product.

Method used

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  • Multi-metal-CHA type molecular sieve catalyst as well as preparation method and application thereof
  • Multi-metal-CHA type molecular sieve catalyst as well as preparation method and application thereof
  • Multi-metal-CHA type molecular sieve catalyst as well as preparation method and application thereof

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preparation example Construction

[0047] The present invention also provides a method for preparing the polymetallic-CHA molecular sieve catalyst described in the technical solution, comprising the following steps:

[0048] a) mixing the first active substance, the second active substance, the auxiliary agent and water to obtain a mixed liquid;

[0049] The first active material is a Cu source; the second active material is a Ce source;

[0050] b) impregnating the CHA-type molecular sieve into the mixed solution, and then spray-drying the mixed solution containing the CHA-type molecular sieve to obtain a multi-metal-CHA-type molecular sieve catalyst.

[0051] In the catalyst preparation method provided by the present invention, firstly, the first active substance, the second active substance, the auxiliary agent and water are uniformly mixed to obtain a mixed liquid. Wherein, the first active substance is a Cu source, preferably including a soluble salt of copper and / or a soluble salt of cuprous, more prefer...

Embodiment 1

[0062] Prepare 1500mL of 0.02mol / L copper nitrate aqueous solution, and then calculate the required ratio of cerium nitrate and SSZ-13 molecular sieve dry powder (silicon-aluminum ratio is 13) according to Cu:Ce:Al atomic number ratio=0.19:0.2:2 Dosage: Dissolve cerium nitrate in proportion to the above copper nitrate aqueous solution and stir evenly, then add polyvinyl alcohol (polymerization degree 1500) dry powder, the amount of dry powder added is 0.1% of the mass of SSZ-13 molecular sieve, and stir evenly to obtain an active substance aqueous solution ; Add SSZ-13 molecular sieve dry powder (silicon-alumina ratio: 13) to the active substance aqueous solution in proportion, and soak at room temperature for 24 hours; then spray-dry the impregnated mixture to obtain dry catalyst powder.

[0063] The above catalyst dry powder, Al 2 o 3 Dry binder powder and deionized water are stirred evenly in a stirrer according to the mass ratio of 30:5:65 to prepare a catalytic slurry; ...

Embodiment 2

[0065] Prepare 1000mL of 0.015mol / L copper acetate aqueous solution, and then calculate the required ratio of cerium nitrate and SSZ-13 molecular sieve dry powder (silicon-aluminum ratio is 5.8) according to Cu:Ce:Al atomic number ratio=0.48:0.07:2 Dosage: Dissolve cerium nitrate in proportion to the above copper acetate aqueous solution and stir evenly, then add high-molecular polycarboxylate ammonium salt (polymerization degree 2000) dry powder. SSZ-13 molecular sieve dry powder (silicon-alumina ratio: 5.8) was added in proportion to the active substance aqueous solution, and soaked at room temperature for 24 hours; after that, the impregnated mixture was spray-dried to obtain dry catalyst powder.

[0066] The above catalyst dry powder, Al 2 o 3 Dry binder powder and deionized water are stirred evenly in a stirrer according to the mass ratio of 30:5:65 to prepare a catalytic slurry; 2 On a cordierite honeycomb ceramic carrier with a volume of 38.6mL, the coating amount is ...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a multi-metal-CHA type molecular sieve catalyst as well as a preparation method and application thereof. The catalyst comprises a first active component, a second active component, an auxiliary agent and a CHA type molecular sieve, wherein the first active component is Cu; the second active component is Ce; theauxiliary agent comprises one or more of ammonium polyacrylate, polyvinyl alcohol, polymethacrylate, maleic anhydride and ammonium polycarboxylate; the molar ratio of silicon dioxide to alumina in theCHA type molecular sieve is less than or equal to 18: 1; and the atomic number ratio of Cu to Ce to Al in the catalyst is (0.19-0.49): (0.05-0.2): 2. The provided catalyst has excellent NOx conversion efficiency and hydrothermal stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a polymetallic-CHA type molecular sieve catalyst and its preparation method and application. Background technique [0002] With the large-scale popularization of diesel engines, the reduction of NOx emissions in exhaust gas has become the focus of attention of all walks of life. Excessive NOx in the atmosphere will cause huge damage to soil and water bodies, and seriously threaten human health. The vast majority of NOx pollutants in the atmosphere come from diesel engines. Therefore, finding an efficient diesel engine exhaust gas purification technology has become an urgent problem to be solved. [0003] In order to effectively reduce NOx in diesel exhaust emissions, the selective catalytic reduction of ammonia (NH 3 -SCR) technology is currently one of the most effective means to remove NOx emissions from diesel engines. Among them, modified molecular sieves have been wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76F01N3/10B01D53/94B01D53/56
CPCB01D53/9413B01J29/763B01J2229/18F01N3/10F01N2570/14
Inventor 马江丽常仕英杨冬霞贺小昆赖慧龙褚国良张晓丽
Owner 稀土催化创新研究院(东营)有限公司
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