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
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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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