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Sol-gel method for preparing three-effect tail gas catalyst

A technology of catalyst and gel method, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. It can solve the problems of unfavorable industrial production, high price, complicated preparation process, etc., and achieve good resistance to high temperature sintering capacity, beneficial to industrial production, and the effect of shortening the process flow

Inactive Publication Date: 2005-09-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the original technology has the following disadvantages: 1. Metal ions are introduced in the combined state of alkoxide, and the preparation of metal alkoxide is difficult and expensive, which directly leads to an increase in the cost of the three-way catalyst; Most of the organic substances such as alcohol are harmful to the human body and do not meet the requirements of environmental protection; 3. The preparation process of the alkoxide sol-gel method is relatively complicated and the production cycle is long, which is not conducive to industrial production
The existence of these defects makes the preparation of traditional sol-gel three-way catalysts remain in the laboratory stage, and there is still a certain distance from the marketization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ①Take 588 grams of Al(NO 3 ) 3 9H 2 O, 25.2 g Ce(NO 3 ) 3 ·6H 2 O, 5.32 g La(NO 3 ) 3 ·6H 2 O, 10.2 g Ba(NO 3 ) 2 , dissolved in 800ml of water to obtain a mixed solution;

[0018] ②Take 250 grams of citric acid and dissolve it in 500ml of alcohol;

[0019] ③ Slowly add the alcohol solution of citric acid into the mixed solution obtained in step ① under stirring conditions, and continue to stir at 300r / min at 40°C for 5 hours, and then stir at 80°C until the solution is completely gelled ;

[0020] ④ drying the sol at 110° C. under an air atmosphere for 12 hours, and then roasting at 600° C. for 4 hours to obtain a loose foam carrier material;

[0021] ⑤ Dissolve 3.2 grams of H in 50ml of distilled water 2 PtCl 6 +1.4 g of Rh(NO 3 ) 3 ;

[0022] ⑥Use the carrier material obtained in step ④ to vacuum impregnate the solution in step ⑤, and then dry it in an air atmosphere at 100°C for 12 hours, and then repeat the dipping and drying until the solution is ...

Embodiment 2

[0025] (2) Example 2: The difference from Example 1 is that in step ③, stir at 30°C for 2 hours, then stir at 70°C until completely gelled, step ④ roasting conditions are 500°C for 6 hours, Al(NO 3 ) 3 9H 2 O dosage is 514.5 grams, Ce(NO 3 ) 3 ·6H 2 O dosage is 50.4 grams. The composition weight ratio of final gained catalyst is: Al 2 o 3 -70%, CeO 2 -20%, La 2 o 3 -2%, BaO-6%, Pt-1.5%, Rh-0.5%.

Embodiment 3

[0026] (3) Example 3: The difference from Example 1 is that in step ③, stir at 50°C for 2 hours, then stir at 90°C until complete gelling, Al(NO 3 ) 3 9H 2 The amount of O taken is 522 grams, Ce(NO 3 ) 3 ·6H 2 The dosage of O is 50.4 grams, La(NO 3 ) 3 ·6H 2 O dosage is 2.7 grams. The composition weight ratio of final gained catalyst is: Al 2 o 3 -71%, CeO 2 -20%, La 2 o 3 -1%, BaO-6%, Pt-1.5%, Rh-0.5%.

[0027] (4) Embodiment 4: the difference from Embodiment 1 is: Al(NO 3 ) 3 9H 2 The dosage of O is 500 grams, Ce(NO 3 ) 3 ·6H 2 O dosage is 50.4 grams, H 2 PtCl 6 The dosage is 6.3 grams, Rh(NO 3 ) 3 The dosage is 2.8 grams. The composition weight ratio of final gained catalyst is: Al 2 o 3 -68%, CeO 2 -20%, La 2 o3 -2%, BaO-6%, Pt-3%, Rh-1%.

[0028] (5) Example 5: The difference from Example 1 is that step 4. the roasting condition is 550°C for 5 hours, Al(NO 3 ) 3 9H 2 O dosage is 573 grams, H 2 PtCl 6 The dosage is 6.3 grams, Rh(NO 3 ) 3 ...

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Abstract

The present invention relates to a car tail gas three-effect catalyst, in the concrete, it is a method for preparing three-effective tail gas catalyst by using sol-gel method. Said method includes the following steps: dissolving soluble salts of Al, Ce, La and Ba in water to obtain mixed solution, under the condition of stirring slowly adding the citric acid alcohol solution as complexing agent into the above-mentioned mixed solution to obtain sol, drying sol and roasting to obtain carrier material, vacuum impregnating carrier material with aqueous solution of soluble salts of Pt and Rh, drying, hydrogen gas reduction to obtain the noble metal catalyst powder.

Description

technical field [0001] The invention relates to a three-way catalyst for automobile tail gas, in particular to a method for preparing a three-way tail gas catalyst by a sol-gel method. Background technique [0002] Automobile exhaust is one of the main sources of air pollution, and a large amount of exhaust gas makes the living environment of human beings deteriorate sharply. Therefore, in order to protect the environment, many countries are actively formulating and enforcing tail gas emission regulations. With the enhancement of public environmental awareness and the development of technology, emission regulations are becoming more and more stringent. The ultimate goal is to make cars reach zero emission standards. The United States, the European Community and Japan have always been leading the world in research on emission technology, and the emission standards they implement are relatively strict. The regulations currently in use in these countries are EU-III or equivalen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/94B01J23/40B01J37/02
Inventor 杨振明张劲松曹小明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI