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Method for preparing catalyst to purify automobile tail gas

A technology for purifying catalyst and automobile exhaust gas is applied to automobile exhaust gas purification catalyst and preparation thereof, three-way catalyst of HC and NOx and preparation thereof, and at the same time purifies the field of automobile exhaust gas CO, which can solve the problems of complex preparation process and achieve high activity, Overcome the effects of high temperature reduction and easy operation

Inactive Publication Date: 2007-07-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of complex preparation processes such as multiple coatings and high-temperature reduction in the preparation process of the three-way catalyst, the present invention provides a catalyst with good catalytic activity and which can be obtained without high-temperature reduction treatment after one-time coating. Preparation method of three-way catalyst with lower cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] To the mixed aqueous solution (the mass percent of each corresponding oxide is: Al 2 o 3 : 90wt%, CeO 2 : 5wt%, ZrO 2 : 2wt%, La 2 o 3 : 1wt%, Pr 6 o 11 : 1wt%, Y 2 o 3 : 1wt%), add 2vol% of Span 80, under stirring conditions, the above-mentioned mixed solution is added in the ammonium oxalate solution, the pH value is controlled to be 9.0, and the reaction time is 80 minutes to obtain the slurry containing the precipitate, Filter, wash with deionized water, bake at 200°C for 1 hour, and then bake at 800°C for 1 hour to obtain composite alumina. The composite alumina and deionized water are mixed at a weight ratio of 1:10, and ball milled on a ball mill to form a coating slurry. Dip the cordierite honeycomb carrier into the coating slurry, take it out after 60 seconds, blow off the slurry on the surface layer with compressed air, bake at 200°C for 1 hour, and bake at 800°C for 1 hour to obtain a coated composite oxide The carrier of the aluminum coating, the w...

Embodiment 2

[0025] To the mixed aqueous solution (the mass percent of each corresponding oxide is: Al 2 o 3 : 50wt%, CeO 2 : 25wt%, ZrO 2 : 5wt%, La 2 o 3 : 1wt%, Pr 6 o 11 : 15wt%, Y 2 o 3 : 2wt%, Fe 2 o 3 : 1wt%, MnO 2 : 1wt%), add 1vol% sodium dodecyl sulfonate, under stirring condition, above-mentioned mixed solution is joined in the ammonium carbonate solution, and pH value is controlled as 4.5, and the reaction time is 40 minutes, obtains containing precipitate The slurry was filtered, washed with deionized water, cooled and dried at room temperature for 24 hours, and then calcined at 400°C for 6 hours to obtain composite alumina. The composite alumina and deionized water are mixed at a weight ratio of 1:5, and ball milled on a ball mill to form a coating slurry. Immerse the cordierite honeycomb carrier into the coating slurry, take it out after 10 seconds, blow off the slurry on the surface layer with compressed air, let it cool and dry at room temperature for 24 hours,...

Embodiment 3

[0027] To the mixed aqueous solution (the mass percent of each corresponding oxide is: Al 2 o 3 : 50wt%, CeO 2 : 15wt%, ZrO 2 : 15wt%, La 2 o 3 : 7wt%, Pr 6 o 11 : 2wt%, Y 2 o 3 : 3wt%, CuO: 5wt%, BaO: 3wt%), add 2vol% of Span 80, under stirring condition, ammonium oxalate solution is added in the above mixed solution, the pH value is controlled to be 9.0, and the reaction time is 80 Minutes to obtain a slurry containing precipitates, filter, wash with deionized water, bake at 80°C for 6 hours, and then bake at 500°C for 6 hours to obtain composite alumina. The composite alumina and deionized water are mixed at a weight ratio of 1:10, and ball milled on a ball mill to form a coating slurry. Dip the cordierite honeycomb carrier into the coating slurry, take it out after 30 seconds, blow off the slurry on the surface layer with compressed air, bake at 80°C for 6 hours, and then bake at 500°C for 6 hours to obtain a coated The carrier of the composite alumina coating, t...

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PUM

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Abstract

A catalyst with high activity for cleaning the tail gas of car is prepared through preparing the coated composite alumina layer containing Ce, Zr and one or more of La, Pr, Y, Fe, Mn, Cu and Ba on the cellular cordierite ceramic carrier, and chemically plating Pd.

Description

technical field [0001] The invention relates to a catalyst for purifying automobile exhaust gas and a preparation method thereof, in particular to a catalyst capable of simultaneously purifying CO, HC and NO in automobile exhaust. x A three-way catalyst and a preparation method thereof belong to the technical field of environmental protection catalysis. Background technique [0002] Since the 1970s, the global automobile sales have been increasing, which has led to serious air pollution problems. Especially after entering the 21st century, the air pollution caused by automobile exhaust emissions has attracted more and more attention. Automobile exhaust contains CO, HC and NO x Such harmful gases have caused serious pollution to the environment on which human beings depend. In order to control the harm of automobile exhaust to human beings, many countries in the world have taken a large number of measures and formulated a series of automobile exhaust emission regulations. ...

Claims

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Application Information

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IPC IPC(8): B01J37/03B01J37/02B01J37/16B01J23/44B01J32/00B01D53/94
Inventor 王来军文明芬李玉山杨栋宋崇立陈靖
Owner TSINGHUA UNIV
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