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Anti-sulfur film type low-temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of easy sulfur poisoning and service life, and achieve easy poisoning, prolong service life, and simple preparation methods Effect

Active Publication Date: 2014-11-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sulfur-resistant membrane low-temperature denitrification catalyst to improve the problems of existing low-temperature SCR catalysts, such as easy sulfur poisoning and service life.

Method used

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  • Anti-sulfur film type low-temperature denitration catalyst and preparation method thereof
  • Anti-sulfur film type low-temperature denitration catalyst and preparation method thereof
  • Anti-sulfur film type low-temperature denitration catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of film stock solution

[0032] Weighing stabilizer hydroxyethyl cellulose (HEC) 1.5g (1.5%), functional additive sodium methyl siliconate 3g (3%), PTEF emulsion, pore-forming agent polyethylene glycol (400) 3g (3%) ), the PTFE emulsion 92.5g (92.5%) of 3% film-forming agent. Then they were mixed and stirred at a constant temperature, the stirring speed was 2000 rpm, mechanical stirring was carried out for 15 minutes, and the temperature was 30°C. Make a thin film stock solution.

[0033] 2. Preparation of low temperature catalyst substrate

[0034] Raw material calculation: Weigh the mass of carrier honeycomb ceramics, according to the active component of the catalyst, manganese-cerium composite oxide accounts for 8% of the carrier, and the element molar ratio of Mn / Ce is 1:0.2; the catalyst additive is 2% of the carrier mass, Ni The molar ratio of / Co / Cu / Sb / Nb is 1:0.5:0.75:0.25:0.3, and the active component precursors manganese nitrate and cerium ni...

Embodiment 2

[0049] 1. Preparation of film stock solution

[0050] Weighing stabilizer hydroxypropyl cellulose (HPMC) 0.5g (0.5%), functional additive sodium methyl siliconate 0.5g (0.5%), pore-forming agent ethanol 0.5g (0.5%), film-forming agent 1% 98.5 g (98.5%) of PTFE emulsion. Then they were mixed and stirred at a constant temperature, the stirring speed was 100 rpm, mechanical stirring was performed for 30 minutes, and the temperature was 60°C. Make a thin film stock solution.

[0051] 2. Preparation of low temperature catalyst substrate

[0052] Calculation of raw materials: Weigh the mass of the carrier molecular sieve, according to the active component of the catalyst, manganese-cerium composite oxide accounts for 15% of the carrier, the element molar ratio of Mn / Ce is 1:0.5; the catalytic aid is 1% of the carrier mass, Ni / Ce The molar ratio of Co / Cu / Sb / Nb elements is 1:0.1:0.1:0.1:0.1, and the active component precursors manganese acetate and cerium sulfate and the catalytic ...

Embodiment 3

[0061] 1. Preparation of film stock solution

[0062] Weighing stabilizer polyvinyl alcohol (PVA) 2g (2%), functional auxiliary agent sodium methyl siliconate 3g (3%), pore-forming agent ethanol 3g (3%), the PTFE emulsion 92g ( 92%). Then they were mixed and stirred at a constant temperature, the stirring speed was 1500 rpm, mechanical stirring was performed for 5 minutes, and the temperature was 25°C. Make a thin film stock solution.

[0063] 2. Preparation of low temperature catalyst substrate

[0064] Calculation of raw materials: Weigh the mass of the carrier activated carbon fiber, according to the active component of the catalyst, manganese-cerium composite oxide accounts for 9% of the carrier, and the element molar ratio of Mn / Ce is 1:1; the catalytic promoter is 3% of the carrier mass, Ni The molar ratio of / Co / Cu / Sb / Nb is 1:1:1:0.5:0.5, and the active component precursors manganese nitrate and cerium sulfate and the catalytic aid precursors nickel nitrate, cobalt a...

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Abstract

The invention relates to an anti-sulfur film type low-temperature denitration catalyst and a preparation method thereof. The catalyst uses honeycomb ceramic as a carrier, (Mn-Ce-Ox) composite oxides as active ingredients and (Ni-Co-Cu-Sb-Nb-Ox) composite oxides as catalytic assistants, and a surface layer is covered by an anti-corrosion, wearproof, hydrophobic and breathable anti-sulfur functional film. The anti-sulfur functional film can effectively prevent matters such as ammonium bisulfate from contacting the active site of the catalyst, slow down deposition of poisons on the surface of the catalyst, prevent impact of dust in flue gas on the catalyst, effectively solve the problem that the low-temperature SCR catalyst easily causes poisoning, and prolong the service life of the low-temperature catalyst. The denitration rate of the catalyst achieves more than 90 percent at the temperature 140-200 DEG C. The anti-sulfur film type low-temperature denitration catalyst and the preparation method thereof have great significance in industrialized application of the low-temperature SCR denitration catalyst and promotion of an SCR denitration technology in China.

Description

technical field [0001] The invention relates to a sulfur-resistant membrane low-temperature denitrification catalyst and a preparation method thereof, belonging to the technical fields of environmental protection catalytic materials and air pollution control. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, which can cause acid rain, photochemical smog, eutrophication of surface water and a series of problems that seriously damage the ecological environment and endanger human health. The national "Twelfth Five-Year Plan" has made it clear that NO x The control of the total amount is included in the focus of environmental governance. Selective Catalytic Reduction (SCR) has become a NO x Key recommended technologies for emission reduction. [0003] At present, the commonly used operating temperature of commercial catalysts is 310-410°C. For most of the built boilers and industrial boilers whose exhaust gas temperature ...

Claims

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Application Information

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IPC IPC(8): B01J23/847B01D53/90B01D53/56
Inventor 祝社民杨波沈岳松沈树宝
Owner NANJING UNIV OF TECH
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