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Catalyst for catalyzing and directly decomposing nitrogen oxide and preparation thereof

A nitrogen oxide and catalyst technology, applied in the field of catalyst and its preparation, achieves the effects of stable structure, high activity and low price

Inactive Publication Date: 2008-11-12
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing perovskite and perovskite-like composite oxide catalysts that catalyze the direct decomposition of nitrogen oxides need to be used at high temperatures, and provide a catalyst that catalyzes the direct decomposition of nitrogen oxides and its preparation method

Method used

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Experimental program
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specific Embodiment approach 1

[0008] Embodiment 1: The catalyst for catalyzing the direct decomposition of nitrogen oxides in this embodiment is made of La 2-x Ba x NiO 4 and Ba(NO 3 ) 2 Made; wherein 02-x Ba x NiO 4 and Ba(NO 3 ) 2 The mass ratio is 5:0.44~5.68.

specific Embodiment approach 2

[0009] Embodiment 2: The difference between this embodiment and Embodiment 1 is that La 2-x Ba x NiO 4 and Ba(NO 3 ) 2 The mass ratio is 5:2. Others are the same as the first embodiment.

specific Embodiment approach 3

[0010] Specific embodiment three: the method for preparing the catalyst for catalyzing the direct decomposition of nitrogen oxides in this embodiment is realized according to the following steps: 1. The lanthanum nitrate, barium nitrate and nickel nitrate are according to the general formula La 2-x Ba x NiO 4 The stoichiometric ratio is mixed and dissolved in distilled water, then the citric acid solid of 2 times the total mass of lanthanum nitrate, barium nitrate and nickel nitrate is added, stirred for 20 to 30 min, and then placed under the condition of 300 to 400 ° C for stirring and evaporation to obtain powder; 2. Grind the powder, calcinate at 450-550℃ for 1-3h, cool with the furnace, press into tablets, and bake at 750-900℃ for 4-6h to obtain La 2-x Ba x NiO 4 ; Third, the La 2-x Ba x NiO 4 and Ba(NO 3 ) 2 Mix uniformly at a mass ratio of 5:0.44-5.68, and calcinate in an oxygen atmosphere of 750-850° C. for 1-3 hours to obtain a catalyst for directly decomposin...

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Abstract

The invention relates to a catalyst for catalytic decomposing nitrogen oxide directly and the preparation thereof, which solves the problem that the existing perovskite and perovskite type composite oxide catalyst for directly catalytic decomposing nitrogen oxide can only be used at high temperature. The catalyst of the invention is prepared by La<2-x>BaNiO<4> and Ba(NO<3>)<2>. The preparation method includes: preparing La<2-x>BaNiO<4>, then mixing with Ba(NO<3>)<2>, and finally baking the mixture to obtain the catalyst for directly catalytic decomposing nitrogen oxide which has high activity even at middle-low temperature.

Description

technical field [0001] The present invention relates to a catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides are the main substances causing air pollution, which can produce acid rain, photochemical smog, heat island effect, and excessive ground-level ozone, threatening the health of humans and animals. NO is the main component of nitrogen oxides. The methods of 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, etc., but there are problems such as large equipment, high cost, and secondary pollution. The catalytic method is divided into two types of catalysts according to the catalytic mechanism: reduction type catalysts and direct decomposition type catalysts, but there is a problem of poor catalyst activity. Although some noble metals have high activity, when there is oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/25B01J23/83B01D53/56
Inventor 朱宇君陈利强袁福龙付宏刚
Owner HEILONGJIANG UNIV