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Copper-based CHA type aluminosilicate molecular sieve catalyst and preparation method thereof

A silicon-alumina molecular sieve and catalyst technology, which is applied in molecular sieve catalysts, catalyst activation/preparation, molecular sieves and alkali exchange compounds, etc., can solve the problems of large amount of template agent and increased preparation cost, and can reduce the amount and meet the temperature window of reaction activity. Wider requirements and the effect of saving raw material costs

Pending Publication Date: 2021-03-12
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing preparation methods, the amount of template agent is usually large, which directly increases the preparation cost

Method used

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  • Copper-based CHA type aluminosilicate molecular sieve catalyst and preparation method thereof
  • Copper-based CHA type aluminosilicate molecular sieve catalyst and preparation method thereof
  • Copper-based CHA type aluminosilicate molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 0.5 g of SSZ-13 silicone aluminum aluminum aluminum aluminum aluminum ratio 20 was added to 30 g of water, and the stirred was uniform, then 0.2 g of 0.2 g of the mixture. 4 F, mixed with a magnetic stirrer at 50 ° C for 12 hours, and the mother liquor was separated from the product by filtration, and the product was washed with deionized water. As a seed crystal.

[0042] Under the conditions of stirring, 23 g of 40% silica sol, 46 g of water, 1.47 gal (OH) were sequentially 3 , 5.98 g 20% ​​of the diamondae, 3.54 g of tetramethylammonium hydroxide was added to a 150 ml reactor with 1.3 g NaOH, and the seed crystals were added for 6 hours, continued to be agitation conditions for 16 h, then heated to 160 ° C. The crystallization was 60 h, and the mixture was removed, and the product was placed in an oven at 110 ° C for 6 h, then calcined at 600 ° C for 2 h to obtain a Na type CHA molecular sieve.

[0043] 0.5mol / lnh 4 The CL solution was mixed with the above-described Na...

Embodiment 2

[0047] The Y molecular sieve 1 g of the silicon aluminum aluminum aluminum aluminum ratio 10 was added to 30 g of water, and the stirred was uniform, then 0.3 g of NH was added to the mixture. 4 F, mixed with a magnetic stirrer for 5 hours at 40 ° C, and the mother liquor was separated from the product by filtration, and the product was washed with deionized water to be used as a seed crystal.

[0048] Under the conditions of stirring, 23 g of 40% silica sol, 46 g of water, 1.47 gal (OH) were sequentially 3 6.83 g 20% ​​of the diamondane, 3.54 g of 4% tetramethylammonium hydroxide was added to a 150 mL reactor with 1.3 g NaOH, and the seed crystals were added for 6 hours, continued to be agitation conditions for 16 h, then heated to 160 ° C. The crystallization 72h was removed from the mixture, and the product was placed in an oven at 110 ° C for 6 h at an oven at 110 ° C for 2 h, followed by a deionized water, and then calcined at 600 ° C to obtain a Na type CHA molecular sieve. ...

Embodiment 3

[0052] The Y molecular sieve 1 g of the silicon aluminum aluminum ratio 15 was added to 30 g of water, and the stirred was uniform, then 0.8 g of NH was added to the mixture. 4 F, mixed with a magnetic stirrer for 4 hours at 50 ° C, separated from the product by filtration, and the product was washed with deionized water. As seeded.

[0053] The rest is the same as in Example 2.

[0054] Marked as sample 3, SiO 2 / Al 2 O 3 = 15.3, specific surface area 550m 2 / g, the average aperture is 0.5 nm, and the Cu content is 3.38 wt%.

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Abstract

The invention relates to a copper-based CHA type aluminosilicate molecular sieve catalyst and a preparation method thereof, and belongs to the field of preparation of molecular sieve catalysts. The catalyst is characterized in that a molecular sieve carrier of the catalyst is a six-membered ring microporous molecular sieve material composed of silicon and aluminum, and the active metal of the catalyst at least comprises copper; the preparation method of the copper-based CHA type aluminosilicate molecular sieve catalyst comprises two steps of hydrothermal synthesis and hydrothermal ion exchange, and comprises the following steps: firstly, preparing a CHA type molecular sieve through a hydrothermal reaction method assisted by seed crystal induction and a multi-element template agent, and then loading Cu and other active centers on the synthesized CHA type molecular sieve by adopting an ion exchange method; and finally, obtaining the copper-based CHA type silicon-aluminum molecular sieveNH3SCR denitration catalyst with high hydrothermal stability and high low-temperature activity.

Description

Technical field [0001] The present invention belongs to the preparation of molecular sieve microporous material and its catalytic process, and is specifically involved in a method of reducing the preparation cost of copper-based CHA type silicone aluminum molecular sieve catalyst. Background technique [0002] With the rapid development of my country's land transportation industry, the use of strong diesel engine power is increasing, such as ships and large diesel vehicles, and also brings serious atmospheric environmental pollution, so mobile source tail gas reduction attention. Diesel engines typically use thin combustion techniques. During transportation, the nitrogen oxide and solid particulate matter are the main contaminants in exhaust gas discharge. The main form of nitrogen oxides is NO and NO 2 . Nitric oxide (NO) is a colorless gas, afterhauling the human body, easy to bind to hematarin in the blood, can cause high-speed hemocystonemia during severe; nitrogen dioxide (N...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J29/78B01J37/10B01J37/30B01J35/10B01D53/94B01D53/56F01N3/10C01B39/46C01B39/48C01B39/02
CPCB01J29/763B01J29/783B01J37/10B01J37/30B01D53/9413F01N3/10C01B39/46C01B39/48C01B39/026B01J2229/186B01J2229/20B01J2229/40B01D2258/01B01D2251/2062F01N2370/04C01P2006/12C01P2006/16B01J35/618B01J35/617B01J35/643B01J35/615Y02T10/12Y02A50/20
Inventor 孙天军王淇陶平李云赫余忆玄赵宝刚
Owner DALIAN MARITIME UNIVERSITY
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