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Method of loading automobile tail gas purifying catalyst onto honeycomb carrier

A technology for purifying catalysts and automobile exhaust, which is applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc. The effect of small coating loss and large amount of coating at one time

Inactive Publication Date: 2005-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] We have found that in the method of loading the catalyst on the carrier provided in the prior art, the amount of the catalyst or the catalyst carrier is less at one time, and the resulting coating is easy to crack and peel off, resulting in the loss of the amount of the catalyst coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] This example illustrates the process of preparing the catalyst by the technique disclosed in CN1239017A.

[0021] Add 250 ml of deionized water to a 500 ml three-necked flask, and add 8 g of LaCl under stirring. 3 ·XH 2 O, 10 grams (NH 4 ) 2 Ce(NO 3 ) 6 Let it dissolve completely. Add ammonia water at room temperature, adjust its pH to 9, wait until the precipitation is complete, raise the temperature to 95°C, age the slurry at this temperature for 1 hour, filter and wash the obtained filter cake until there is no acid radical, and obtain a mixture of lanthanum and cerium hydroxide for use .

[0022] Get 113 grams of pseudo-boehmite (the alumina content is 33% by weight, produced by Qilu Catalyst Factory), add deionized water, stir for 30 minutes, and make a slurry with a solid content of 14wt%, add 1: 1 hydrochloric acid to adjust the value to pH =2.8; Add the mixture of lanthanum and cerium hydroxide prepared above and continue to stir; Continue to add 113 gram...

example 2

[0025] This example illustrates the process of preparing a catalyst using the method disclosed in CN1055302A.

[0026] With the rhodium chloride aqueous solution that contains 0.3 gram rhodium, impregnating specific surface area is 70 square meters per gram and 10.0 gram zirconia of 200 angstroms average diameters, then 120 ℃ of drying 12 hours, calcination 1 hour in 500 ℃ of airs, generate containing 2.9 Zirconia powder of weight % rhodium. Then impregnate 150 grams of alumina with a specific surface area of ​​150 square meters per gram with a platinum chloride solution containing 1.5 grams of platinum, then dry at 150°C for 12 hours, and calcinate in air at 500°C for 1 hour to produce platinum-containing alumina powder.

example 3

[0028] This example illustrates the preparation of a catalyst by the method disclosed in US5081095.

[0029] ① 3000 grams of cerium carbonate Ce 2 (CO 3 ) 3 solution (35% water), reacted with 1569 grams of glacial acetic acid to produce cerium acetate. Drying and firing at 425°C for 2 hours (with 30 ft3 / min of air) produced high specific surface cerium oxide.

[0030] ② Preparation of slurry containing 428 grams of γ-Al 2 o 3 , 22 grams of alumina monohydrate, 122 grams of high specific surface cerium oxide obtained in 1., 97 grams of cerium acetate prepared by the method in 1., 10 grams of glacial acetic acid and 571 grams of water. This slurry contained about 50% by weight oxide.

[0031] ③Preparation of an amine mixed aqueous solution of Pt chloride and Rh chloride.

[0032] ④The method of supporting the catalyst: coat the carrier with the slurry in ②, dry at 120°C for 8 hours and bake in an air atmosphere at 427°C for 1 hour; then impregnate the carrier with the sol...

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Abstract

The method of loading automobile tail gas purifying catalyst onto honeycomb carrier features honeycomb iolite carrier through water washing pre-treatment, the catalyst slurry with modifying solution in 1-10 wt%, and the modifying solution comprising surfactant 1 portion, deionized water 9-99 portions as solvent, and acid 0.5-6.0 portions or alkali 7.5-9.5 portions for pH regulation. The catalyst has great once applied amount and less coating loss.

Description

technical field [0001] The invention relates to a method for loading an automobile tail gas purification catalyst, and more particularly relates to a method for loading an automobile tail gas purification catalyst on a honeycomb carrier. Background technique [0002] With the promulgation and gradual strictness of my country's environmental protection laws and regulations, the installation of automobile exhaust purification catalysts is a very effective off-machine purification method to control automobile exhaust emissions. The effect of automobile exhaust purification is closely related to the bonding strength of the catalyst coating and the carrier. Only guarantee The catalyst coating is not easy to fall off, so that the precious metal attached to its surface can effectively catalyze the conversion of harmful substances into harmless substances. [0003] The pretreatment of the carrier is closely related to the durability of the catalyst coating. If the bonding strength be...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J35/04B01J37/02
Inventor 贺振富邵潜沈宁元李燕秋李晓燕李阳
Owner CHINA PETROLEUM & CHEM CORP
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