Supported denitration catalyst based on pillared clay and preparation method thereof

A technology of denitrification catalyst and pillared clay, which is applied in the field of denitrification catalyst, can solve the problems of unsatisfactory sulfur resistance performance, decreased denitrification efficiency, and poor effect, and achieves strong resistance to SO2 poisoning, improved sulfur resistance performance, and low cost. Effect

Active Publication Date: 2020-01-24
北京中盛旭鑫环境能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101422728A discloses a kind of using purple clay pottery clay and anatase type TiO 2 As a denitration catalyst carrier prepared from raw materials, the catalyst loaded with active components has outstanding wear resistance and anti-poisoning ability, but its catalytic efficiency reaches more than 95% at a temperature of about 340 ° C, which is different from commercial V 2 o 5 -WO 3 / TiO 2 They also belong to the middle and high temperature stage catalysts, which are limited in practical application
Shen (Ceria Modified MnOx / TiO 2 -Pillared Clays Catalysts for Selective Catalytic Reduction of NO with NH 3 at Low Temperature[J].Chinese Journal of Catalysis,2011,32(12):1803-1811.) Use single element Ti to carry out pillar modification to clay and use it as catalyst carrier, after supporting Mn and Ce, Mn- CeOx / Ti-PILCs catalyst, the catalytic efficiency of the temperature range (200-240°C) can reach more than 80%, but the effect of the low-temperature range (120-180°C) is not good, and the sulfur resistance performance is not ideal, and the denitrification efficiency decreases within 6h almost 60%

Method used

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  • Supported denitration catalyst based on pillared clay and preparation method thereof
  • Supported denitration catalyst based on pillared clay and preparation method thereof
  • Supported denitration catalyst based on pillared clay and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of pillared clay

[0030] Take 19mL tetraethyl orthosilicate (TEOS), 5mL 2mol / L hydrochloric acid, and 5.5mL absolute ethanol, and mix them uniformly to obtain a silica sol. 2g of bentonite and water were mixed into a bentonite suspension with a mass concentration of 1%; 34mL of butyl titanate [CH 3 (CH 2 ) 30 ] 4 Ti was mixed with 1 mol / L HCL solution, and the stirring was continued for 3 hours to obtain a titanic acid mixed solution, wherein the molar ratio of H / Ti was 4. Mix the titanic acid mixed solution prepared above with the silica sol evenly, and age for 5 hours to obtain the columnizing agent; slowly drop the obtained columnizing agent into the bentonite suspension under the condition of 60°C water bath and stirring, and finish the aging for 12 hours. Then carry out centrifugation, wash and filter the separated solid product with ethanol water solution with a volume ratio of 1:1, repeat several times, place the washed solid product in an ov...

Embodiment 2

[0034] (1) Preparation of silicon-based pillared clay

[0035] Take 19mL tetraethyl orthosilicate (TEOS), 5mL 2mol / L hydrochloric acid, and 5.5mL absolute ethanol, and mix them to obtain a silica sol. 2g of bentonite and water were mixed into a bentonite suspension with a mass concentration of 1%; 34mL of butyl titanate [CH 3 (CH 2 ) 30 ] 4 Ti was mixed with 1 mol / L HCL solution, and the stirring was continued for 3 hours to obtain a titanic acid mixed solution, wherein the molar ratio of H / Ti was 4. Mix and age the prepared titanic acid mixed solution with silica sol for 3 hours to obtain a columnar agent; slowly drop the obtained columnar agent into the bentonite suspension under the condition of stirring in a water bath at 60°C, age for 12 hours after the addition, and then carry out Centrifuge, wash and filter the separated solid product with an ethanol aqueous solution with a volume ratio of 1:1, repeat several times, dry the washed solid product in a 60°C oven for 12...

Embodiment 3

[0039] (1) Preparation of silicon-based pillared clay

[0040] Take 2.43mL tetraethyl orthosilicate (TEOS), 0.5mL 2mol / L hydrochloric acid, and 0.7mL absolute ethanol, and mix them to obtain a silica sol. 2g of bentonite and water were mixed into a bentonite suspension with a mass concentration of 1%; 37.3mL of butyl titanate [CH 3 (CH 2 ) 30 ] 4 Ti was mixed with 1 mol / L HCL solution, and the stirring was continued for 3 hours to obtain a titanic acid mixed solution, wherein the molar ratio of H / Ti was 4. Mix and age the prepared titanic acid mixed solution with silica sol for 3 hours to obtain a columnar agent; slowly drop the obtained columnar agent into the bentonite suspension in a water bath at 60°C with stirring, and finish the aging for 12 hours. Then carry out centrifugation, wash and filter the separated solid product with ethanol water solution with a volume ratio of 1:1, repeat several times, place the washed solid product in an oven at 60°C for 12 hours, and t...

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Abstract

The invention provides a loaded denitration catalyst based on pillared clay. According to the loaded denitration catalyst, pillared clay Si-M-PILC is taken as a carrier, Mn and Ce loaded in silica-based pillared clay are taken as active components, Si-M in the silica-based pillared clay is compound oxidized sol and is taken as a pillaring substance of the pillared clay, and an M element is Ti or Zr. The invention further provides a preparation method of the loaded denitration catalyst based on the pillared clay. The preparation method comprises two steps of preparing the silica-based pillared clay and loading the active element Mn and / or Ce. According to the loaded denitration catalyst based on the pillared clay and the preparation method, the low cost is guaranteed, meanwhile, the catalytic denitration efficiency of the pillared clay catalyst in medium-low temperature section is further improved, and the sulfur resistance of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a supported denitration catalyst based on pillared clay and a preparation method thereof. Background technique [0002] NO X It can cause environmental problems such as acid rain, photochemical smog and ground ozone, and is one of the main pollutants causing air pollution in my country. The "Thirteenth Five-Year Plan" has stricter requirements in the field of air pollution control, focusing on "ultra-low emissions" - that is, dust, SO 2 , NO X Emission concentrations are not higher than 10mg / m 3 、35mg / m 3 , 50mg / m 3 , and passed the "Comprehensive Implementation of Coal-fired Power Plant Ultra-low Emissions and Energy-Saving Retrofit Project Work Plan" to require qualified coal-fired power plants in the eastern, central and western regions to achieve ultra-low emissions by the end of 2017, the end of 2018, and the end of 2020, respectively. There i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/34B01J32/00
Inventor 李建军张序刘勤郭家秀刘永军楚英豪
Owner 北京中盛旭鑫环境能源科技有限公司
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