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Composite rear earth pyrochlore-type oxide catalyst for catalyzing burning for removing soot of diesel vehicle and preparation method thereof

A technology of catalytic combustion and diesel vehicles, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve problems such as human health hazards, and achieve the effects of reduced production costs, easy operation, and simple synthesis processes

Inactive Publication Date: 2010-11-10
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the main pollutants emitted by diesel engines are soot particles (PM), nitrogen oxides (NOx), hydrocarbons (HC) and carbon monoxide (CO), which have brought serious harm to the earth's environment and human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1.La 2 sn 2-x mn x o 7 preparation and testing

[0019] La(NO 3 ) 3 9H 2 O, Mn(NO 3 ) 2 and SnCl 4 The mixed salt solution, x takes 0, 0.1, 0.2 and 0.3 respectively, La 3+ , Mn 2+ and Sn 4+ The total concentration of ions is 1.0mol / l; 2mol / l ammonia lye is used as the precipitant, and the reagents used are analytically pure.

[0020] At room temperature, drop the above-mentioned mixed salt solution and alkali solution into a container filled with distilled water at the same time, stir vigorously, and keep the pH value of the solution at about 9-13, continue to stir the obtained slurry for 2 hours after dropping, and then place it in a water bath at 80°C aging in medium for 14 hours, and then washed and filtered with deionized water until the pH of the filtrate = 7, and the resulting filter cake was dried at 200° C. for 18 hours to obtain a pyrochlore precursor. The obtained precursor was placed in a muffle furnace, first calcined at 400° C. for 1 h,...

Embodiment 2

[0022] Example 2.La 2 sn 2-x Fe x o 7 preparation and testing

[0023] La(NO 3 ) 3 9H 2 O, Fe(NO 3 ) 3 9H 2 O and SnCl 4 The mixed salt solution, x takes 0, 0.1, 0.2 and 0.3 respectively, La 3+ , Fe 3+ and Sn 4+ The total concentration of ions is 1.0mol / l; 2mol / l ammonia lye is used as the precipitant, and the reagents used are analytically pure.

[0024] At room temperature, drop the above-mentioned mixed salt solution and alkali solution into a container filled with distilled water at the same time, stir vigorously, and keep the pH value of the solution at about 9-13, continue to stir the obtained slurry for 2 hours after dropping, and then place it in a water bath at 80°C aging in medium for 14 hours, and then washed and filtered with deionized water until the pH of the filtrate = 7, and the resulting filter cake was dried at 200° C. for 18 hours to obtain a pyrochlore precursor. The obtained precursor was placed in a muffle furnace, first calcined at 400° C. ...

Embodiment 3

[0026] Example 3.La 2 sn 2-x co x o 7 preparation and testing

[0027] La(NO 3 ) 3 9H 2 O, Co(NO3 ) 2 ·6H 2 O and SnCl 4 The mixed salt solution, x takes 0, 0.1, 0.2 and 0.3 respectively, La 3+ 、Co 2+ and Sn 4+ The total concentration of ions is 1.0mol / l; 2mol / l ammonia lye is used as the precipitant, and the reagents used are analytically pure.

[0028] At room temperature, drop the above-mentioned mixed salt solution and alkali solution into a container filled with distilled water at the same time, stir vigorously, and keep the pH value of the solution at about 9-13, continue to stir the obtained slurry for 2 hours after dropping, and then place it in a water bath at 80°C aging in medium for 14 hours, and then washed and filtered with deionized water until the pH of the filtrate = 7, and the resulting filter cake was dried at 200° C. for 18 hours to obtain a pyrochlore precursor. The obtained precursor was placed in a muffle furnace, first calcined at 400° C. fo...

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Abstract

The invention provides a composite rear earth pyrochlore-type oxide catalyst for catalyzing burning for removing soot of a diesel vehicle and a preparation method thereof, belonging to the technical field of a tail gas cleaning catalyst of the diesel vehicle. The expression formula of the composite metal oxide is A2B2-xMxO7, wherein A is La, B is Sn, M is Mn, Fe, Co, Ni or Cu. The invention adopts a coprecipitation method to prepare the catalyst, the preparation process is simple, and the cost is low. The preparation method comprises the following steps: mixing metal nitrate and tin tetrachloride solution; adjusting the pH value by ammonia solution; drying the obtained deposit; and roasting the deposit at the high temperature to obtain the composite rear earth pyrochlore-type oxide catalyst. Under the effect of the catalyst, a simulation diesel vehicle exhausts, the burning temperature of the soot particles is lowered to the exhaust range of the diesel vehicle, and the speed of the soot oxidation rate is improved. The catalyst is a useful catalyst for removing the pollution of soot particles of the diesel vehicle.

Description

Technical field: [0001] The invention relates to a rare-earth pyrochlore-type composite oxide catalyst capable of reducing the combustion temperature of soot particles emitted by diesel vehicles and a preparation method thereof, belonging to the technical field of diesel vehicle tail gas purification catalysts. Background technique: [0002] Due to its advantages of low fuel consumption, high power and good durability, diesel engines are increasingly widely used in various power plants, trucks, locomotives and ships and other large equipment. Especially for the high fuel economy and low emission characteristics of diesel engines, diesel engines for light vehicles and cars have also become the development direction of the automobile industry. At present, 20% of cars and 90% of commercial vehicles in Europe use diesel engines, 9.2% of cars and 38% of commercial vehicles in Japan use diesel engines, and most commercial vehicles in the United States use diesel engines. The deve...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01J23/34B01J23/835B01D53/94
Inventor 王仲鹏王立国李昕魏少杰张昭良
Owner UNIV OF JINAN
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