Preparation method for catalyst for removing NOx

A catalyst and carrier technology, applied in the field of catalyst preparation, can solve the problems of long time, waste of water resources, environmental protection pressure, complicated procedures, etc., and achieve the effects of saving resources, easier control of active component content, and easy operation of the preparation process.

Active Publication Date: 2019-03-08
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the wet exchange not only has cumbersome procedures, takes a long time, produces a large a

Method used

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  • Preparation method for catalyst for removing NOx
  • Preparation method for catalyst for removing NOx

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] The cordierite carrier was placed in a 0.01 mol / L copper nitrate solution and allowed to stand still, and the amount of metal impregnated in the carrier was 1.5% of the dry weight of the subsequently coated molecular sieve. Then take it out at a drying temperature of 50°C and a drying time of 2h. Then the configured CHA molecular sieve slurry is coated on the dried carrier, and the coated carrier is aged at a drying rate of 0% for 1 hour, and finally the dried and roasted temperature is 450℃. Time is 3h to get sample 1.

Example Embodiment

[0028] Example 2

[0029] The aluminum titanate carrier was placed in a 0.5 mol / L copper acetate solution and allowed to stand, and the amount of metal impregnated by the carrier was 2% of the dry weight of the molecular sieve to be subsequently coated. Then take it out at a drying temperature of 65°C and a drying time of 1h. Then the configured CHA molecular sieve slurry is coated on the dried carrier, and the coated carrier is aged at a drying rate of 25% for 4 hours, and finally the dried and roasted temperature is 500℃. Time is 2h to get sample 2.

Example Embodiment

[0030] Example 3

[0031] The silicon carbide carrier is placed in a 1 mol / L copper sulfate solution and allowed to stand, and the amount of metal impregnated in the carrier is 4% of the dry weight of the molecular sieve to be subsequently coated. Then take it out at a drying temperature of 80°C and a drying time of 0.5h. Then the configured CHA molecular sieve slurry is coated on the dried carrier, and the coated carrier is aged at a drying rate of 50% for 8 hours, and finally the dried and roasted temperature is 600℃. Time is 1h to get sample 3.

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Abstract

The invention relates to a preparation method for catalyst for removing NOx, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps of: firstly, preparing a metal salt solution, then, enabling a carrier to stand in the salt solution to be dipped, taking out the carrier to be processed and dried, coating the carrier with molecular sieve material slurry which realizes a synergistic effect with the metal salt, drying and ageing the coated carrier, and finally, drying and roasting the carrier to obtain NOx catalyst. When the preparation method disclosed by the invention is adopted to prepare the catalyst for removing NOx, the preparation technology of the preparation method is simple and easy in operation, resources are saved, and the content of active ingredients can be more easily controlled.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for removing NOx, and belongs to the technical field of catalyst preparation. Background technique [0002] Molecular sieve catalysts for NOx removal are currently a hot spot in research at home and abroad. Molecular sieves are widely considered to be excellent catalysts for NOx removal due to their wide catalytic window, high low-temperature activity, high thermal stability, strong acidity, and no secondary pollution. Characteristic, environmentally friendly new exhaust gas treatment catalyst material. Some countries and regions in Europe and the Americas have compulsorily adopted molecular sieves as catalysts for after-treatment of automobile exhaust. [0003] The current process of molecular sieve SCR catalysts is to first introduce the active metal components into the pores of molecular sieves by means of wet exchange, and then make a slurry of metal-containing molecular sieves and coat th...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J29/46B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J29/46B01J29/763B01J37/0201B01J37/0215B01J37/082
Inventor 施文杰金炜阳周钧陈加伟岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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