Preparation method of non-noble metal containing monolithic supported catalyst

A non-precious metal and catalyst technology, which is applied in the field of automobile emission, can solve the problems of easy peeling off of the coating, cumbersome and complicated preparation process, and small amount of enrichment coating, so as to solve the problems of uneven coating, low firmness and good durability. The effect of high temperature performance

Active Publication Date: 2017-12-08
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 methods for preparing denitration catalysts have the following problems: (1) The loading rate of the active components is low; (2) The coating of the active components of the catalyst on the surface of the carrier is uneven, local enrichment occurs or the coating amount is too small; (3) The activity The combination of the 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 non-noble metal containing monolithic supported catalyst
  • Preparation method of non-noble metal containing monolithic supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Pretreatment of cordierite ceramic support

[0016] Soak the cordierite ceramic carrier in 2% ammonia water at room temperature, take it out after 60 minutes, rinse it repeatedly with deionized water until the pH of the solution after washing is neutral, dry it at 105°C, and calcinate at 500°C for 4 hours .

[0017] (2) Preparation of mixed solution containing non-precious metal active components

[0018] a. Weigh 660g of copper nitrate and 178.6g of cerium nitrate and dissolve in 4720g of deionized water; b. Add 1200g of ZSM5 molecular sieve powder and stir for 2h; c. Add 23.4g of ammonium carbamate and stir for 1h at 60°C; add 500g of silica sol (SiO 2 content is 40%), 250g aluminum sol (Al 2 o 3 content of 40%), 200g mass fraction of 1% sodium carboxymethyl cellulose, and stir evenly to obtain a mixed solution.

[0019] (3) Cordierite carrier activation

[0020] Put the cordierite carrier obtained after pretreatment in (1) into the mixed solution containing...

Embodiment 2

[0027] (1) Pretreatment of cordierite ceramic support

[0028] Soak the cordierite ceramic carrier in 3.8% ammonia water at room temperature, take it out after 20 minutes, rinse it with deionized water repeatedly until the pH of the solution after washing is neutral, dry it at 95°C, and calcinate at 500°C for 2 hours .

[0029] (2) Preparation of mixed solution containing non-precious metal active components

[0030] a. Weigh 600g of copper nitrate and 120g of lanthanum nitrate and dissolve in 5200g of deionized water; b. Add 1200g of Sapo34 molecular sieve powder and stir for 4h; c. Add 19.6g of ammonium carbamate and stir for 3h at 45°C; add 300g of silica sol (SiO 2 content is 40%), 300g aluminum sol (Al 2 o 3 content of 40%), 300g mass fraction of 1% sodium carboxymethylcellulose, and stir evenly to obtain a mixed solution.

[0031] (3) Cordierite carrier activation

[0032] Put the cordierite carrier obtained after pretreatment in (1) into the mixed solution contain...

Embodiment 3

[0034] (1) Pretreatment of cordierite ceramic support

[0035] Soak the cordierite ceramic carrier in 3% 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 100°C, and calcinate at 500°C for 2 hours .

[0036] (2) Preparation of mixed solution containing non-precious metal active components

[0037] a. Weigh 480g of copper nitrate and 85.3g of manganese nitrate and dissolve in 5500g of deionized water; b. Add 1200g of beta40 molecular sieve powder and stir for 2h; c. Add 14.5g of ammonium carbamate and stir for 2h at 60°C; add 250g of silica sol (SiO 2 content is 40%), 220g aluminum sol (Al 2 o 3 content of 40%), 300g mass fraction of 1% sodium carboxymethylcellulose, and stir evenly to obtain a mixed solution.

[0038] (3) Cordierite carrier activation

[0039] Put the cordierite carrier obtained after pretreatment in (1) into the mixed solution containi...

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Abstract

The invention relates to a preparation method of a non-noble metal containing monolithic supported catalyst. The prepared non-noble metal containing monolithic supported catalyst is characterized by being uniformly loaded in active components, high in firmness of a coating and a carrier, and simple in preparation technological process; engine bench test results show that the conversion rate of NOx reaches 97% under the working condition of B50; furthermore, a non-noble metal system is adopted, so that the non-noble metal containing monolithic supported catalyst is low in preparation cost.

Description

technical field [0001] The invention relates to a method for preparing a monolithic carrier catalyst containing non-precious metals, 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 NO x The technical route, the principle is the ammonia gas produced by the hydrolysis of urea and the NO in the automobile exhaust x When passing over a carrier coated with an active coating, NO x Quickly reduced by ammonia to nitrogen and water, ammonia and NO x The ability to carry out rapid chemical reactions on the post-processing carrier 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 the active components, and secondly provides a suitable catalytic reaction channel. Without the suppor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/85B01J29/78B01J29/76B01J35/10B01J37/02B01J37/08B01D53/94B01D53/56
CPCB01D53/9418B01D2258/01B01J29/46B01J29/763B01J29/7815B01J29/85B01J35/1004B01J37/0018B01J37/0207B01J37/0213B01J37/0236B01J37/08B01J2229/186B01J2229/20
Inventor 于力娜张克金崔龙王丹韩建
Owner CHINA FIRST AUTOMOBILE
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