Catalyst capable of reducing soot particle combustion temperature and preparation method thereof

A technology of combustion temperature and soot particles, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve the effects of easy operation, promotion of soot combustion, and simple methods

Active Publication Date: 2013-05-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a catalyst with high catalytic activity is needed to reduce the oxidation temperature of carbon black particles, so that the carbon black particles on the filter are oxidized and removed to regenerate, so as to avoid excessive accumulation of carbon black particles on the filter, block the filter, and affect Diesel performance

Method used

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  • Catalyst capable of reducing soot particle combustion temperature and preparation method thereof
  • Catalyst capable of reducing soot particle combustion temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 0.005 mol of potassium nitrate and 0.1 mol of manganese acetate, mix them uniformly in a mortar and grind for 10 minutes, then put them into a muffle furnace and bake at 600°C for 5 hours.

[0015] Mix the catalyst obtained above with the soot particles at a mass ratio of 10:1, stir them evenly in a mortar, and put them into a fixed-bed reaction. At 1000ppmNO+5v%O 2 In the atmosphere of +He, the heating rate is 2°C / min from 200°C until the soot is completely burned out. Chromatographic recording of CO 2 and CO production. CO 2 Corresponding to the temperature at the time when the concentration of CO is the maximum is the temperature T at the time of the highest burning speed of soot p . Under this catalyst T p = 384°C.

Embodiment 2

[0017] Weigh 0.01 mol of potassium nitrate and 0.1 mol of manganese acetate, mix them uniformly in a mortar and grind for 10 minutes, then put them into a muffle furnace and bake at 600°C for 5 hours.

[0018] Measure the combustion situation of soot by embodiment 1, under this catalyst T p = 365°C.

Embodiment 3

[0020] Weigh 0.02 mol of potassium nitrate and 0.1 mol of manganese acetate, mix them uniformly in a mortar and grind for 10 minutes, then put them into a muffle furnace and bake at 600°C for 5 hours.

[0021] Measure the combustion situation of soot by embodiment 1, under this catalyst T p = 345°C.

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Abstract

The invention provides a catalyst capable of reducing soot particle combustion temperature and a preparation method thereof. The active component of the catalyst is oxide of manganese and the assistant active component is alkali metal, alkaline-earth metal or rare-earth metal. The preparation method is that: manganese acetate and nitrate or acetate solid which is used as the assistant active component are weighed according to the components and the molar ratio of the catalyst, the weighed solids are evenly mixed and ground, and the ground solid mixture is calcined in a muffle furnace at 400-700 DEG C to obtain. The catalyst provided by the invention is used for purifying pollution caused by tail gas emitted by diesel vehicles, can reduce the temperature at which soot in the tail gas is combusted into carbon dioxide to the temperature within the temperature range of the tail gas emitted by the diesel vehicles, and is a useful catalyst capable of promoting the combustion of the soot in the tail gas emitted by the diesel vehicles. The preparation method of the invention has the advantages that the method is simple, the operation is easy, the method is suitable for industrialized production and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion, and in particular relates to a catalyst capable of reducing the combustion temperature of soot particles in diesel vehicle exhaust and a preparation method thereof. Background technique [0002] Due to the dwindling of oil resources and the increasing trend of global warming, diesel engines, especially direct injection diesel engines, are 2 Low emissions and more and more attention. However, the NOx and particulate matter (PM) emissions of diesel engines are relatively high, especially the PM emissions are 30 to 70 times that of gasoline engines, and some are even as high as 100 times. There have been many domestic reports on the research on catalysts for NOx elimination, mainly focusing on catalysts for selective catalytic reduction. However, there are few literature reports on catalysts to solve the PM emission problem. Carbon black is the main component of PM. There are three m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/04B01J23/02B01J23/10B01D53/94B01D53/46
Inventor 杨维慎孙淑敏楚文玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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