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Catalyst for eliminating carbon soot particles and nitrogen oxides simultaneously, preparation and application thereof

A technology of soot particles and nitrogen oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low NOx elimination efficiency and achieve reaction The process is easy to control, the production cost is low, and the effect of easy industrial production

Inactive Publication Date: 2010-07-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a variety of catalysts such as noble metals, molecular sieves, perovskites, and spinels are used for this reaction, but there is a common problem: the elimination efficiency of NOx is too low, and the efficiency of some catalysts to eliminate NOx is only 10-20%.

Method used

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  • Catalyst for eliminating carbon soot particles and nitrogen oxides simultaneously, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Preparation of MnMgAlO catalyst loaded with 1.5wt.% K

[0016] 1). Weigh 9.191g manganese acetate, 9.615g magnesium nitrate and 9.378g aluminum nitrate, dissolve with 100ml deionized water to obtain a mixed salt solution; in addition, weigh 8g sodium hydroxide and 1.325g anhydrous sodium carbonate, and use 100ml Dissolve in deionized water to obtain a mixed alkali solution;

[0017] 2). Add 100ml of equal volumes of mixed salt solution and lye to the empty beaker dropwise at the same time, and perform mechanical stirring. During the stirring process, adjust the titration speed of the two to control the pH value of the precipitate to be 9-10; the obtained The precipitated solution was stirred and aged in a water bath at 50°C for 2 hours, then suction filtered, and washed with deionized water until the specific conductivity of the filtrate was lower than 5×10 -3 S / m or less. The obtained filter cake was dried in a water bath at 50°C for 10 hours, and then drie...

Embodiment 2

[0019] Example 2 Preparation of 4.5wt.% K-loaded MnMgAlO catalyst

[0020] 1). Same as the preparation process of mixed lye and mixed salt solution in Example 1;

[0021] 2). Add the mixed salt solution and lye into the empty beaker drop by drop at the same time, and carry out mechanical stirring. During the stirring process, adjust the titration speed of the two to control the pH value of the precipitate to be 9-10; Stir and age in a water bath for 2.5 hours, then filter with suction, wash with deionized water until the specific conductivity of the filtrate is lower than 5×10 -3 S / m or less. The obtained filter cake was dried in a water bath at 55°C for 10.5 hours, and then dried in an oven at 100°C for 10.5 hours to obtain a precursor; the precursor was fired in a muffle furnace at 10°C / min to 800°C for 4 hours to obtain MnMgAlO hydrotalcite base composite oxide material;

[0022] 3). Weigh 0.466g potassium nitrate and dissolve it with 450ml deionized water. Add 4 grams ...

Embodiment 3

[0023] Example 3 Preparation of MnMgAlO catalyst loaded with 7.5%wt.%K

[0024] 1). Same as the preparation process of mixed lye and mixed salt solution in Example 1;

[0025] 2). Add the mixed salt solution and lye into the empty beaker drop by drop at the same time, and carry out mechanical stirring. During the stirring process, adjust the titration speed of the two to control the pH value of the precipitate to be 9-10; Stir and age in a water bath for 3 hours, then filter with suction, wash with deionized water until the specific conductivity of the filtrate is lower than 5×10 -3 S / m or less. The obtained filter cake was dried in a water bath at 60°C for 11 hours, and then dried in an oven at 110°C for 11 hours to obtain a precursor; the precursor was fired in a muffle furnace at 10°C / min to 800°C for 4 hours to obtain MnMgAlO hydrotalcite base composite oxide material;

[0026] 3). Weigh 0.777g potassium nitrate and dissolve it with 450ml deionized water. Add 4 grams o...

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Abstract

The invention relates to a catalyst for eliminating carbon soot particles and nitrogen oxides simultaneously, preparation and application thereof. The catalyst is based upon a MnMgAlO hydrotalcite-based complex oxide catalyst, and potassium serves as an auxiliary active ingredient. The catalyst is prepared by a co-precipitation method with constant pH value; and the catalyst is prepared by the following steps: preparing mixed basic solution and mixed salt solution; dripping the mixed basic solution and the mixed salt solution together; controlling the pH value of precipitate to be 9 to 10 by adjusting the dripping rate; and adjusting the load of the potassium. In the reaction atmosphere of simulated diesel exhaust, the carbon soot particles can be quickly combusted and 27 volume percent of NOx can be removed within a temperature range of the diesel exhaust, and NOx. The catalyst has the advantages of low cost of raw materials, simple preparation process and excellent catalytic effect.

Description

technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalysts, in particular to a hydrotalcite-based catalyst for simultaneously eliminating soot particles and nitrogen oxides in diesel vehicle exhaust and a preparation method thereof. Background technique [0002] Compared with gasoline vehicles, diesel vehicles have the advantages of good power, economy and durability, so they have been widely used in recent years. However, during the combustion of diesel fuel, a large amount of nitrogen oxides and soot particles are produced, causing great environmental pollution. Since the elimination of the two pollutants cannot be achieved simply by improving the engine, it is necessary to develop a catalytic aftertreatment technology that simultaneously eliminates the two pollutants. At present, a variety of catalysts such as noble metals, molecular sieves, perovskites, and spinels are used for this reaction, but there is a common problem: th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/02B01D53/94B01D53/56
Inventor 孟明李倩查宇清
Owner TIANJIN UNIV
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