NOx storage and reduction catalyst for purifying tail-gas of internal-combustion engine

A technology for catalysts and internal combustion engines, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as poor NOx reduction effect

Inactive Publication Date: 2006-11-29
MAOMING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NOx reduction is poor under lean conditions due to excess oxygen in the exhaust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Catalyst of the present invention is prepared by following method:

[0026] (1), the aluminum nitrate water is mixed with the aluminum salt solution that the molar concentration is 0.3mol / L; Ethyl titanate water is mixed with the titanium salt solution that the molar concentration is 0.4mol / L;

[0027] (2), by the ratio of 1: 1 by molar ratio, sodium carbonate, sodium hydroxide are made into the precipitation solution of pH=13;

[0028] (3), according to the ratio that the atomic ratio of Ti and Al in the carrier is 1: 2, the aluminum salt solution and the titanium salt solution prepared in step (1) are added dropwise respectively in the precipitation solution in step (2) , stir, and dropwise add the precipitation solution to maintain pH = 10.5. After the aluminum salt solution and titanium salt solution are added dropwise, stir for 1 hour, stand at room temperature for 10 hours, filter, wash until the filtrate pH = 7.5, and the filter cake Dry at a temperature of 100-...

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Abstract

A Nox bearing-reducing catalyst with high NOx redox power and bearing power and high resistant to sulfur poisoning for cleaning the tail gas of IC engine is composed of titanium aluminum oxide as carrier, Pt-Pd as active component, and BaO as assistant.

Description

technical field [0001] The invention relates to a catalyst, in particular to a NO catalyst for purifying the tail gas of an internal combustion engine x Storage-Reduction Catalyst. Background technique [0002] NO x It is one of the main causes of environmental problems such as acid rain and chemical smog. About 40-60% of NOx comes from the exhaust of motor vehicles (internal combustion engines). Purifying motor vehicle exhaust and reducing the emission of pollutants such as NOx have been paid attention to by people. In the 1970s and 1980s, people used SCR technology (Selective Catalyst Reduction) to reduce NOx to N 2 , achieved better results. Studies have found that running a motor vehicle under lean fuel conditions (the air-fuel ratio is greater than the theoretical air-fuel ratio) can effectively reduce NOx, CO 2 and CH emissions and improve fuel combustion efficiency, but the oxygen concentration is higher. Due to the excess oxygen in the exhaust gas under lean bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01J21/06B01J21/04B01D53/94
Inventor 陈英何俊王乐夫陈小平马玉刚李雪辉
Owner MAOMING COLLEGE
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