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SCR low-temperature denitration catalyst based on ZIF-67 porous carbon skeleton modification, and preparation method of SCR low-temperature denitration catalyst

A technology of ZIF-67 and low-temperature denitrification, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Effect of surface area and thermal stability

Active Publication Date: 2019-10-25
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a SCR low-temperature denitrification catalyst based on ZIF-67 porous carbon skeleton modification and its preparation method in order to solve the problem of traditional denitrification catalysts in the prior art. The technical problem of poor activity, the SCR low-temperature denitrification catalyst of the present invention has excellent low-temperature activity and sulfur resistance

Method used

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  • SCR low-temperature denitration catalyst based on ZIF-67 porous carbon skeleton modification, and preparation method of SCR low-temperature denitration catalyst
  • SCR low-temperature denitration catalyst based on ZIF-67 porous carbon skeleton modification, and preparation method of SCR low-temperature denitration catalyst
  • SCR low-temperature denitration catalyst based on ZIF-67 porous carbon skeleton modification, and preparation method of SCR low-temperature denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) 10g D90 value is 3μm anatase TiO 2 Add 500mL of 1wt% PVP-K30 aqueous solution, ultrasonically stir and disperse for 3h, place in a water bath at 50°C and stir and heat for 1h, then use deionized water to filter, wash, and dry at 80°C for 6h to obtain PVP functionalized TiO 2 , denoted as PVP-TiO 2 ;

[0039] (2) 4.5g Co(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL deionized water, 10 g PVP-TiO 2 Ultrasound, stirring and dispersing in the solution, after continuing stirring for 1 hour, standing and aging at 50°C for 3 hours to obtain the first mixed solution;

[0040] (3) Dissolve 55g of dimethylimidazole in 200mL of deionized water to obtain an aqueous solution of dimethylimidazole, stir the aqueous solution of dimethylimidazole and the first mixed solution at a mass ratio of 1:10, and react with stirring at 30°C 6h, centrifuged with ethanol, washed, and vacuum dried at 80°C for 12h to obtain ZIF-67 modified TiO 2 Powder material, denoted as ZIF-67@TiO 2 , grindi...

Embodiment 2

[0049] (1) 10 g of anatase TiO with a D90 value of 3 μm 2 Add 500mL of 1wt% PVP-K30 aqueous solution, ultrasonically stir and disperse for 3h, place in a water bath at 50°C and stir and heat for 1h, then use deionized water to filter, wash, and dry at 80°C for 6h to obtain PVP functionalized TiO 2 , denoted as PVP-TiO 2 ;

[0050] (2) 5.4g Co(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL deionized water, 10 g PVP-TiO 2 Ultrasound, stirring and dispersing in the solution, after continuing stirring for 1 hour, standing and aging at 50°C for 3 hours to obtain the first mixed solution;

[0051] (3) Dissolve 66g of dimethylimidazole in 250mL of deionized water to obtain an aqueous solution of dimethylimidazole, stir the aqueous solution of dimethylimidazole and the first mixed solution at a mass ratio of 7:10, and react with stirring at 30°C 6h, centrifuged with ethanol, washed, and vacuum dried at 80°C for 12h to obtain ZIF-67 modified TiO 2 Powder material, denoted as ZIF-67@TiO...

Embodiment 3

[0059] (1) 10 g of anatase TiO with a D90 value of 5 μm 2 Add 500mL of 1wt% PVP-K30 aqueous solution, ultrasonically stir and disperse for 3h, place in a water bath at 50°C and stir and heat for 1h, then use deionized water to filter, wash, and dry at 80°C for 6h to obtain PVP functionalized TiO 2 , denoted as PVP-TiO 2 ;

[0060] (2) 5.4g Co(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL deionized water, 10 g PVP-TiO 2 Ultrasound, stirring and dispersing in the solution, continue to stir for 1 hour, then stand and age at 30°C for 1 hour to obtain the first mixed solution;

[0061] (3) Dissolve 66g of dimethylimidazole in 250mL of deionized water to obtain an aqueous solution of dimethylimidazole, stir the aqueous solution of dimethylimidazole and the first mixed solution at a mass ratio of 2:5, and react with stirring at 40°C 6h, centrifuged with ethanol, washed, and vacuum dried at 80°C for 12h to obtain ZIF-67 modified TiO 2 Powder material, denoted as ZIF-67@TiO 2 , grind...

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Abstract

The invention discloses a SCR low-temperature denitration catalyst based on ZIF-67 porous carbon skeleton modification, and relates to the field of flue gas catalytic denitration, and the technical problems of great damage and poor low-temperature activity of a traditional denitration catalyst are solved. Carbonized Co-MOF (ZIF-67) is in situ grown on the surface of TiO2, in particular, the surface of the TiO2 is non covalently functionalized by PVP, the problem of insufficient growth sites on the surface of the TiO2 is overcome, amino groups are uniformly modified on the surface of the TiO2,then through the method that ligands are added after adsorption of Co2+, the in-situ growth of the ZIF-67 is realized, the surface of the TiO2 is evenly coated with the ZIF-67, and a novel TiO2 carrier coated with highly dispersed CoOx porous carbon is obtained by carbonization. The invention further discloses a preparation method of the SCR low-temperature denitration catalyst based on the ZIF-67porous carbon skeleton modification, and the reaction condition of the method is simple and mild.

Description

technical field [0001] The invention relates to the field of flue gas catalytic denitrification, in particular to an SCR low-temperature denitrification catalyst based on ZIF-67 porous carbon skeleton modification and a preparation method thereof. Background technique [0002] At present, the main flue gas removal technology at home and abroad mainly adopts selective catalyst reduction (SCR). A commercially widely used catalyst is V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 The catalyst has good denitrification performance and sulfur poisoning resistance between 300 and 400 °C. However, the active component in this type of catalyst—vanadium is toxic, which is easy to cause harm to people and the environment, and it is easy to release SO in the flue gas. 2 converted to SO 3 , with NH 3 Substances such as ammonium sulfate are formed to cover the active sites and block the catalyst channels. In addition, the low-temperature activity of vanadium / titanium-based cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J23/889B01J35/10B01J37/08B01D53/86B01D53/56
CPCB01J31/1691B01J31/1815B01J23/8892B01J37/082B01D53/8628B01D2258/0283B01J2531/845B01J35/23B01J35/61Y02C20/10
Inventor 王光应项胜宋剑潘有春魏彤徐奎龙红明
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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