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Preparation method of supported catalyst with anchoring enhanced NOx removal

A catalyst and carrier technology, applied in the field of carrier catalyst preparation, can solve the problems of narrow catalyst temperature window, cumbersome and complicated preparation process, and less enrichment coating amount, etc., to solve uneven coating, low firmness, and wide temperature range window effect

Active Publication Date: 2020-05-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned preparation method for preparing the denitrification carrier catalyst has the following problems: (1) the temperature window of the catalyst is narrow, the selectivity is poor, and the NO X The conversion rate is low; (2) The coating of the active component is uneven, local enrichment occurs or the coating amount is too small; (3) The combination of the active component coating and the carrier is low, and the coating is easy to fall off; (4) The preparation process is cumbersome and complicated

Method used

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  • Preparation method of supported catalyst with anchoring enhanced NOx removal
  • Preparation method of supported catalyst with anchoring enhanced NOx removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Pretreatment of cordierite honeycomb carrier

[0015] Soak the cordierite ceramic carrier in 2% ammonia water at room temperature, take it out after 60 minutes, rinse it with deionized water repeatedly until the pH of the solution after washing is neutral, dry it at 105°C, and calcinate at 500°C for 4 hours .

[0016] (2) Preparation of anchoring enhancement mixture

[0017] a. Weigh 300g of copper nitrate, 240g of ferric nitrate, 120g of cerium nitrate and dissolve in 5300g of deionized water; b. Add 1200g of Sapo34 molecular sieve powder and stir for 2h; c. Add 21.2g of ammonium carbamate and stir for 1h at 60°C; 400g silica sol (SiO 2 content is 40%), 450g aluminum sol (Al 2 o 3 content is 40%), 400g sodium carboxymethyl cellulose aqueous solution (mass fraction 1%), and stir evenly to obtain a mixed solution.

[0018] (3) Activation of cordierite honeycomb support

[0019] Put the cordierite honeycomb carrier obtained after the pretreatment in (1) into the...

Embodiment 2

[0025] (1) Pretreatment of cordierite honeycomb carrier

[0026] Soak the cordierite ceramic carrier in 3.8% ammonia water at room temperature, take it out after 60 minutes, rinse it with deionized water repeatedly until the pH of the solution after washing is neutral, dry it at 105°C, and calcinate at 500°C for 4h .

[0027] (2) Preparation of anchoring enhancement mixture

[0028] a. Weigh 480g of copper nitrate, 400g of ferric nitrate, 150g of lanthanum nitrate and dissolve in 5200g of deionized water; b. Add 1200g of ZSM5 molecular sieve powder and stir for 4h; c. Add 34.2g of ammonium carbamate and stir for 3h at 45°C; 180g silica sol (SiO 2Content is 40%), 200g aluminum sol (Al 2 o 3 content of 40%), 550g sodium carboxymethyl cellulose aqueous solution (mass fraction 1%), and stir evenly to obtain a mixed solution.

[0029] (3) Activation of cordierite honeycomb support

[0030] Put the cordierite honeycomb carrier obtained after pretreatment in (1) into the molecu...

Embodiment 3

[0032] (1) Pretreatment of cordierite honeycomb carrier

[0033] Soak the cordierite ceramic carrier in 2% ammonia water at room temperature, take it out after 30 minutes, rinse it with deionized water repeatedly until the pH of the solution after washing is neutral, dry it at 105°C, and calcinate at 500°C for 3 hours .

[0034] (2) Preparation of anchoring enhancement mixture

[0035] a. Weigh 400g of copper nitrate, 400g of ferric nitrate, 180g of manganese nitrate and dissolve in 6200g of deionized water; b. Add 1200g of Sapo34 molecular sieve powder and stir for 2h; c. Add 32.8g of ammonium carbamate and stir for 2h at 55°C; 350g silica sol (SiO 2 content is 40%), 300g aluminum sol (Al 2 o 3 content of 40%), 180g sodium carboxymethyl cellulose aqueous solution (mass fraction 1%), and stir evenly to obtain a mixed solution.

[0036] (3) Activation of cordierite honeycomb support

[0037] Put the cordierite honeycomb carrier obtained after pretreatment in (1) into the ...

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Abstract

The invention relates to a preparation method of a supported catalyst for removal of NOx based on anchoring enhancement. The preparation method comprises that copper and iron ions, transition metal ions and a molecular sieve undergo a reaction at a certain temperature under the chemical action of ammonium carbamate so that the active components are supported and dispersed uniformly, and an activeproduct with high efficiency selectivity of NOx anchoring enhancement is formed in the combustion process. The preparation method has a good NOx conversion rate. The supported catalyst has the highestNOx conversion rate of 96.1% under the working condition of B50, a C100 NOx conversion rate of 82.9% at 548 DEG C, a C25 NOx conversion rate of 86.8% at 198 DEG C, high NOx activity in 198-548 DEG Cand a low coating falling rate. The preparation method has simple processes and can be easily industrialized.

Description

technical field [0001] The invention relates to a method for preparing a carrier catalyst with anchoring enhanced NOx removal, and belongs to the technical field of automobile emission. Background technique [0002] In order to meet emission regulations, Urea-SCR technology has become the first choice for medium and heavy-duty diesel engine enterprises to reduce NOx technology. The principle is that when the ammonia gas produced by urea hydrolysis and NOx in automobile exhaust pass through the carrier coated with active coating, NOx is quickly eliminated. Ammonia is reduced to nitrogen and water. Ammonia and NOx can undergo rapid chemical reactions on the post-treatment carrier, which is inseparable from the composition of the carrier. The carrier with an active coating is composed of a carrier and a catalyst. The carrier first bears the coating and active components, and secondly provides a suitable catalytic reaction channel. Without the support of the carrier, the catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J29/46B01J29/76B01J37/02B01J37/08B01D53/94B01D53/56
Inventor 于力娜司小云张克金崔龙苏中辉
Owner CHINA FIRST AUTOMOBILE
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