Catalyzer catalyzing and directly decomposing nitrogen oxide and preparing method and application of the same

A technology for catalytic decomposition of nitrogen oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, separation methods, etc., can solve problems such as catalyst poisoning, lack of resources, expensive precious metals, etc.

Inactive Publication Date: 2008-03-05
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some noble metals and metal oxides have high activity, when there is oxygen in the reaction or NO is decomposed to obtain oxygen, the catalyst will be poisoned. Moreover, noble metals are expensive and resources are scarce. Therefore, scientists from all over the world are looking for a cheap, Efficient NO removal catalyst
In recent years, although the reported Cu-ZSM-5 catalyst has high NO decomposition activity, there are still oxygen and SO 2 Poisoning, high activity, narrow temperature range, unstable molecular sieve framework, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation and use of catalysts that catalyze the direct decomposition of nitrogen oxides, La 2 NiO 4 The preparation method is to weigh lanthanum nitrate and nickel nitrate according to the amount of substance 1:1, add to water, stir and dissolve, then add citric acid solid twice the total amount of the above components, stir for 20 minutes, evaporate under stirring , concentrated, exploded, the product obtained after the explosion was ground, placed in a muffler furnace, roasted at 500°C for 2 hours, cooled, pressed into tablets, and then placed in a muffler furnace, roasted at 900°C for 5 hours to obtain La 2 NiO 4 ; BaCO 3 The preparation method is to mix Ba(NO 3 ) 2 ·6H 2 O and (NH 4 ) 2 CO 3 respectively dissolved in water, stirred to dissolve, (NH 4 ) 2 CO 3 The solution was added dropwise to the stirred Ba(NO 3 ) 2 solution, a white precipitate was obtained, washed, dried at 105°C, ground, and then calcined at 900°C for 5 hours to obtain white BaCO...

Embodiment 2

[0019] Preparation and use of catalysts that catalyze the direct decomposition of nitrogen oxides, La 2 NiO 4 The preparation method is to weigh lanthanum nitrate and nickel nitrate according to the amount of substance 1:1, add to water, stir and dissolve, then add citric acid solid twice the total amount of the above components, stir for 20 minutes, evaporate under stirring , concentrated, exploded, the product obtained after the explosion was ground, placed in a muffler furnace, roasted at 500°C for 2 hours, cooled, pressed into tablets, and then placed in a muffler furnace, roasted at 900°C for 5 hours to obtain La 2 NiO 4 ; BaCO 3 The preparation method is to mix Ba(NO 3 ) 2 ·6H 2 O and (NH 4 ) 2 CO 3 respectively dissolved in water, stirred to dissolve, (NH 4 ) 2 CO 3 The solution was added dropwise to the stirred Ba(NO 3 ) 2 solution, a white precipitate was obtained, washed, dried at 105°C, ground, and then calcined at 900°C for 5 hours to obtain white BaCO...

Embodiment 3

[0021] Preparation and use of catalysts that catalyze the direct decomposition of nitrogen oxides, La 2 NiO 4 The preparation method is to weigh lanthanum nitrate and nickel nitrate according to the amount of substance 1:1, add to water, stir and dissolve, then add citric acid solid twice the total amount of the above components, stir for 20 minutes, evaporate under stirring , concentrated, exploded, the product obtained after the explosion was ground, placed in a muffler furnace, roasted at 500°C for 2 hours, cooled, pressed into tablets, and then placed in a muffler furnace, roasted at 900°C for 5 hours to obtain La 2 NiO 4 ; BaCO 3 The preparation method is to mix Ba(NO 3 ) 2 ·6H 2 O and (NH 4 ) 2 CO 3 respectively dissolved in water, stirred to dissolve, (NH 4 ) 2 CO 3 The solution was added dropwise to the stirred Ba(NO 3 ) 2 solution, a white precipitate was obtained, washed, dried at 105°C, ground, and then calcined at 900°C for 5 hours to obtain white BaCO...

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Abstract

The present invention is catalyst for catalyzing direct decomposition of nitrogen oxide and its preparation process and application. Up to now, nitrogen oxide is eliminated through either one catalyzed reduction process, which is limited by the reductant hydrocarbon, ammonia, etc; or one catalyzed direct decomposition process, which is simple, effective and economic. The catalyst for catalyzing direct decomposition of nitrogen oxide of the present invention consists of La2NiO4 and BaCO3 in the weight ratio of 2-9 to 1. The catalyst is suitable for catalyzed direct decomposition of nitrogen oxide in the presence or absence of oxygen.

Description

Technical field: [0001] The invention relates to a catalyst, in particular to a catalyst for directly decomposing nitrogen oxides, a preparation method and application thereof. Background technique: [0002] Nitrogen oxide is the main substance that causes air pollution. It can produce acid rain, photochemical smog, heat island effect, and high ground ozone concentration, threatening the health of humans and animals. NO is the main component of nitrogen oxide. At present, the methods for eliminating NO can be divided into two categories: non-catalytic methods and catalytic methods. Non-catalytic methods mainly include wet absorption method, solid adsorption method, electron beam irradiation method and so on. These methods often have problems such as huge equipment, high cost, and secondary pollution. Catalytic method is a method of eliminating NO that has been widely studied at present. The key technology is to develop catalysts with high activity and selectivity, good sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J27/232B01D53/56
Inventor 朱宇君袁福龙王东张国付宏刚李丽
Owner HEILONGJIANG UNIV
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