Integral automobile exhaust purification catalyst and preparation method thereof

A technology for purifying catalysts and automobile exhaust gas. It is applied in catalyst activation/preparation, physical/chemical process catalysts, catalyst carriers, etc. It can solve the problems of complicated coating process, high cost of precious metal catalysts, easy falling off, etc., and achieve the price of raw materials. Low cost, lower raw material cost, good binding effect

Inactive Publication Date: 2011-01-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the coating process is complex and easy to fall off, and the cost of the noble metal catalyst is high, the invention provides a method for preparing an automobile exhaust purification catalyst, and also provides an automobile exhaust purification catalyst, which has high catalytic activity and low price Catalyst active ingredients, experiments have proved that its catalytic activity can be compared with precious metals platinum, palladium, rhodium

Method used

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  • Integral automobile exhaust purification catalyst and preparation method thereof
  • Integral automobile exhaust purification catalyst and preparation method thereof
  • Integral automobile exhaust purification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 1mol of aluminum nitrate and make a solution with deionized water, heat and stir to 75°C, add 0.5mol of aluminum powder, heat and reflux at 90°C for reaction, continue to add aluminum powder in 3 batches (addition sequence is as follows: 1mol, 1mol, 0.5mol ), control the pH value of the solution at 2-4 in the reaction process, cool after the reaction is complete, and centrifuge to remove the precipitate at the bottom, and the supernatant is a colorless and transparent alumina sol; then add 0.063mol lanthanum nitrate in the sol, 0.106 mol of barium nitrate, 0.0068 mol of polyethylene glycol 6000, stirred to dissolve completely, can obtain coating precursor sol, that is, modified alumina sol.

[0032] After cleaning the cordierite honeycomb ceramics with distilled water, immerse them in 0.5mol / L nitric acid for 3 days, take them out and wash off the residual nitric acid with distilled water, then ultrasonically clean them with distilled water for 10 minutes, take them...

Embodiment 2

[0037] Take 1mol of aluminum chloride and make a solution with deionized water, heat and stir to 70°C, add 0.5mol of aluminum powder, heat and reflux at 90°C for reaction, continue to add aluminum powder in 2 batches, and add 1mol in each batch. During the reaction process, the pH value of the solution was controlled at 2-5. After the reaction was complete, it was cooled, and the precipitate at the bottom was removed by centrifugation. The supernatant was a colorless and transparent alumina sol; mol of barium nitrate, 0.09mol of polyethylene glycol 400, stirring to make it completely dissolved to obtain the coating precursor sol;

[0038] After cleaning the cordierite honeycomb ceramics with distilled water, immerse them in 3mol / L nitric acid for 1 day, take them out and wash off the residual nitric acid with distilled water, then ultrasonically clean them with distilled water for 30 minutes, take them out and dry them to get the pretreated cordieri Bluestone honeycomb ceramic...

Embodiment 3

[0043] Take 1mol of aluminum nitrate and make a solution with deionized water, heat and stir to 80°C, add 0.5mol of aluminum foil, heat and reflux at 90°C for reaction, continue to add aluminum foil in 2 batches, add 1mol in each batch, and control the pH of the solution during the reaction The value is 2-5, after the reaction is complete, cool down, and centrifuge to remove the precipitate at the bottom. Then add 0.0055mol of lanthanum nitrate, 0.052mol of strontium nitrate and 0.017mol of polyethylene glycol 10000 to completely dissolve the coating precursor sol;

[0044] After cleaning the cordierite honeycomb ceramics with distilled water, immerse them in 1mol / L nitric acid for 2 days, take them out and wash off the residual nitric acid with distilled water, then ultrasonically clean them with distilled water for 10-30min, take them out and dry them to get the pretreated cordierite honeycomb ceramic samples.

[0045] Put the pretreated cordierite honeycomb ceramics into t...

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Abstract

The invention discloses an integral automobile exhaust purification catalyst and a preparation method thereof, and relates to preparation of aluminum oxide sol, modification of a plurality of oxides in the introduced La2O3, CeO2, BaO, SrO, CaO, ZrO2, CuO, SiO2 and the like, load of the modified aluminum oxide sol on cordierite honeycomb ceramic and loads of a plurality of catalyst active ingredients in La, Sr, Co, Cu, Mn, Fe, Pd and the like. The cordierite honeycomb ceramic is used as a carrier; the modified aluminum sol is loaded on the cordierite honeycomb ceramic carrier by adopting a vacuum impregnation method; and the catalyst active ingredients are loaded on a modified aluminum oxide coating by adopting the vacuum impregnation method. When the modified aluminum oxide coating with large specific surface area is used for loading a perovskite type rare-earth catalyst, the load is uniform, the bonding property is strong, the crystal form structure of the catalyst is not changed; and the catalyst has good catalytic activity, air-fuel ratio fluctuation resistance and sulfur dioxide poisoning resistance.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to an integral automobile tail gas purification catalyst and a preparation method thereof, and belongs to the technical field of environmental protection catalysis. technical background [0002] In today's society, cars have become an indispensable means of transportation in people's daily life. In recent years, China's car ownership is still growing. In addition, according to US media reports, China's car ownership is expected to surpass Japan in 2011, second only to the United States. China is a big country of automobiles, and its sales growth rate is astonishing. In 2010 or 2011, the number of automobiles will increase to 75 million, an increase of more than 12 million compared with 2009, making it the second largest country in the world. Because the fuel used in automobiles is still mainly gasoline, the increase in automobile ownership has directly led to the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J32/00B01J37/02B01D53/94B01D53/62B01D53/72B01D53/56
Inventor 曾令可祝杰刘艳春王慧王兆春程小苏刘平安
Owner SOUTH CHINA UNIV OF TECH
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