Preparation method and application of catalyst for low-temperature synergetic catalytic purification of NOx and HCN in flue gas

A technology of synergistic catalysis and catalyst, which is applied in the field of flue gas purification, can solve the problems of low-temperature and high-efficiency denitrification, and achieve the effects of improving catalytic conversion rate and low-temperature purification efficiency, reducing supply, and eliminating heating or heat exchange processes

Inactive Publication Date: 2019-05-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core element of low-temperature denitrification is a catalyst with high catalytic efficiency at low temperature. However, there is currently no catalyst for low-temperature and high-efficiency denitrification.

Method used

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  • Preparation method and application of catalyst for low-temperature synergetic catalytic purification of NOx and HCN in flue gas
  • Preparation method and application of catalyst for low-temperature synergetic catalytic purification of NOx and HCN in flue gas
  • Preparation method and application of catalyst for low-temperature synergetic catalytic purification of NOx and HCN in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: In this example, low-temperature synergistic catalytic purification of NO in flue gas x and HCN catalyst supported by TiO 2 , the active component is La 2 o 3 and CuO, the active component (La 2 o 3 and CuO) with a mass percentage of 10%, where La 2 o 3 1% for CuO, 9% for CuO, denoted as La 1 Cu 9 / TiO 2 ;

[0033] A Low-temperature Synergistic Catalytic Purification of NO in Flue Gas x And the catalyst preparation method of HCN, concrete steps are as follows:

[0034] (1) The active metal salt (La(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·6H 2 O is dissolved in deionized water to obtain a metal salt solution, wherein the concentration of metal cations in the metal salt solution is 0.475mol / L;

[0035] (2) Under stirring conditions, dissolve citric acid in ethanol to obtain a citric acid / ethanol solution, wherein the molar ratio of citric acid to tetrabutyl titanate is 1:1, and the concentration of citric acid in the citric acid / ethanol solution is ...

Embodiment 2

[0044] Example 2: The preparation method of the catalyst in this example is basically the same as the preparation method in Example 1, except that in step (4), ammonia water is added drop by drop to adjust the pH of the system to 11;

[0045] The application of the catalyst in this example is the same as the method in Example 1, and the test results are as follows: at a temperature of 150°C, using low-temperature synergistic catalytic purification of NO x and HCN catalyst La 1 Cu 9 / TiO 2 (pH=11), NO x and HCN purification efficiencies were 94.28% and 98.65%, respectively.

Embodiment 3

[0046] Example 3: The preparation method of the catalyst in this example is basically the same as the preparation method in Example 1, except that in step (4), ammonia water is added drop by drop to adjust the pH of the system to 9;

[0047] The application of the catalyst in this example is the same as the method in Example 1, and the test results are as follows: at a temperature of 150°C, using low-temperature synergistic catalytic purification of NO x and HCN catalyst La 1 Cu 9 / TiO 2 (pH=9), NO x and HCN purification efficiencies were 92.15% and 96.69%, respectively.

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Abstract

The invention discloses a preparation method and application of a catalyst for low-temperature synergetic catalytic purification of NOx and HCN in flue gas, and belongs to the technical field of fluegas purification. The method comprises the following steps: dissolving citric acid in ethanol to obtain a citric acid / ethanol solution; then adding tetrabutyl titanate into the citric acid / ethanol solution; uniformly carrying out mixing to obtain a tetrabutyl titanate-citric acid / ethanol solution; dropwise adding glacial acetic acid into the tetrabutyl titanate-citric acid / ethanol solution to carry out a reaction for 30-40 minutes to obtain a solution A; dropwise adding an active metal salt solution into the solution A, uniformly carrying out mixing, adding nitric acid, then dropwise adding ammonia water to adjust the pH value of the system to 3-5 or 9-11, and carrying out heating to 70-80 DEG C at a constant speed to obtain a gel B; and drying the gel B at a temperature of 90-110 DEG C for 2-3 days, carrying out calcinating at a temperature of 300-500 DEG C for 3-4 hours, and carrying out furnace cooling, grinding, tabletting and sieving to obtain the catalyst for low-temperature synergetic catalytic purification of the NOx and HCN in the flue gas. The catalyst is used for low-temperature synergetic catalytic purification of the NOx and HCN in the flue gas.

Description

technical field [0001] The invention relates to a low-temperature synergistic catalytic purification of NO in flue gas x The invention relates to a catalyst preparation method and application of HCN and belongs to the technical field of flue gas purification. Background technique [0002] The composition of coke oven flue gas is complex and contains a large amount of NO x , SO 2 , HCN and a small amount of VOCs and other gas pollutants. Conventional coke oven flue gas treatment technology usually only treats the conventional pollutant SO contained in it 2 and NO x to process. However, the direct emission of unconventional pollutant HCN in flue gas will cause serious impact on the environment. HCN is a highly toxic gas. Inhalation of high concentration hydrogen cyanide gas in a short period of time can lead to acute poisoning and death. HCN is highly toxic and corrosive, which not only easily causes corrosion of raw gas pipelines and reduces the service life of equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/34B01J35/10B01D53/86B01D53/56B01D53/54
CPCB01D53/8628B01D53/8621B01D2258/0283B01D2255/20707B01D2255/2065B01D2255/2063B01D2255/20761B01D2255/2073B01D2255/20746B01D2255/808B01D2257/408B01J21/063B01J23/83B01J23/34B01J23/10B01J23/75B01J23/72B01J37/04B01J37/08B01D2257/404B01J35/1014B01J35/1038B01J35/1061
Inventor 王学谦王琪宁平王郎郎马强张英杰
Owner KUNMING UNIV OF SCI & TECH
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