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Metal pillared montmorillonite supported gamma-MnO2 low-temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and montmorillonite technology, applied in the field of denitrification catalysis, can solve the problems of expensive catalyst carrier, high reaction temperature, and poor catalyst performance, and achieve excellent anti-SO2 performance, good low-temperature activity, and high mechanical properties.

Active Publication Date: 2017-02-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the expensive catalyst carrier in the prior art, high reaction activity temperature, and catalyst anti-SO 2 Defects with poor performance, providing a metal-pillared montmorillonite loaded γ-MnO 2 Low-temperature denitrification catalyst and preparation method thereof

Method used

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  • Metal pillared montmorillonite supported gamma-MnO2 low-temperature denitration catalyst and preparation method thereof
  • Metal pillared montmorillonite supported gamma-MnO2 low-temperature denitration catalyst and preparation method thereof
  • Metal pillared montmorillonite supported gamma-MnO2 low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Weigh about 100g of calcium-based montmorillonite raw soil and disperse it in 1.5mol / L (NaPO 3 ) 6 In the solution, adjust the pH of the solution to 7 with ammonia water, and add 5wt% NaCl at the same time to replace the interlayer Ca of montmorillonite. 2+ , and use 4000 ~ 5000r / min emulsification machine pulp, stand still for about 24h, use the method of siphon to remove the upper layer slurry, and filter, wash and dry to get Na-MMT, weigh 45g Na-MMT and dissolve in deionized Make up about 9g / 100mL slurry in water.

[0022] 2. Weigh 2.67g Ni(NO 3 ) 2 .6H 2 O was dissolved in deionized water, and the slurry made in 50mL step 1 was measured in a 250mL three-necked flask, and the dissolved Ni(NO 3 ) 2 .6H 2 O was slowly added dropwise into the three-necked flask, and the molar ratio of Ni metal to montmorillonite was controlled to be 0.03:1. Stirring was continued, and the temperature was raised to 80°C for 3.5 hours, then moved to a stainless steel autoclave a...

Embodiment 2

[0028] 1. Weigh about 100g of calcium-based montmorillonite raw soil and disperse it in 1.5mol / L (NaPO 3 ) 6 In the solution, adjust the pH of the solution to 7 with ammonia water, and add 5wt% NaCl at the same time to replace the interlayer Ca of montmorillonite. 2+ , and use 4000 ~ 5000r / min emulsification machine pulp, stand still for about 20h, use the method of siphon to remove the upper layer slurry, and filter, wash and dry to get Na-MMT, weigh 45g Na-MMT and dissolve in deionized Make up about 9g / 100mL slurry in water.

[0029] 2. Weigh 4.62g of ZrO(NO 3 ) 2 .XH 2 O was dissolved in deionized water, and the slurry made in 50mL step 1 was measured in a 250mL three-necked flask, and the dissolved ZrO(NO 3 ) 2 .XH 2 O was slowly added dropwise into the three-necked flask, and the molar ratio of Zr metal to montmorillonite was controlled to be 0.03:1, and the stirring was continued, and the temperature was raised to 80°C for 3.5 hours, and then moved to a stainless ...

Embodiment 3

[0032] 1. Weigh about 100g of calcium-based montmorillonite raw soil and disperse it in 1.5mol / L (NaPO 3 ) 6 In the solution, adjust the pH of the solution to 7 with ammonia water, and add 5wt% NaCl at the same time to replace the interlayer Ca of montmorillonite. 2+ , and use 4000 ~ 5000r / min emulsification machine pulp, stand still for about 20h, use the method of siphon to remove the upper layer slurry, and filter, wash and dry to get Na-MMT, weigh 45g Na-MMT and dissolve in deionized Make up about 9g / 100mL slurry in water.

[0033] 2. Weigh 8g of Ce(NO 3 ).6H 2 O was dissolved in deionized water, and the slurry made in 50mL step 1 was measured in a 250mL three-necked flask, and the dissolved Ce(NO 3 ).6H 2 Slowly add O into the three-necked flask, control the molar ratio of Ce metal and montmorillonite to 0.01:1, keep stirring, raise the temperature to 80°C for 3.5h, then move to a stainless steel autoclave at 150°C for 10h, after the reaction Further suction filtrat...

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Abstract

The invention belongs to the field of flue gas denitration and provides a metal pillared montmorillonite supported gamma-MnO2 low-temperature denitration catalyst and a preparation method thereof, aiming at low support strength of existing commercial catalysts and the defects of the denitration properties of Mn-based catalysts in the presence of SO2. The catalyst is characterized in that lamellar montmorillonite is taken as a support, is interlayer-pillared by metals with different SO2 resistance and simultaneously supports gamma-MnO2 with higher low-temperature activity. The catalyst and the preparation method have the beneficial effects that superiority combination of gamma-MnO2 and interlayer SO2 resistant metals is achieved by utilizing the large specific surface area of lamellar montmorillonite; the catalyst prepared by adopting the method has high mechanical strength, is unnecessary to be calcined at high temperature, has good low-temperature activity and also has excellent SO2 resistance; besides, adopted montmorillonite is abundant in China, is low in cost, is easy to mold and transport and is an excellent catalyst support which can be actually used.

Description

technical field [0001] The invention belongs to the field of denitrification catalysis, in particular to a layered pillared montmorillonite loaded gamma-MnO 2 Low temperature denitrification catalyst. Background technique [0002] Ammonia Selective Catalytic Reduction Denitrification (NH 3 -SCR) is currently the most widely used flue gas denitrification technology in the world. The method has many advantages such as high denitrification activity, simple device structure, low reaction temperature, and little pollution. At present, the SCR denitration catalyst is mainly V-W-Ti, which has good denitration activity and is resistant to SO 2 High performance, but the TiO used in the catalyst 2 The price is high, and crystal transformation is prone to occur at high temperatures. At the same time, the V-based catalyst used in this catalyst has poor low-temperature activity, and V is prone to volatilization at high temperatures, resulting in a narrow catalytic activity window and...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/34B01J23/8892
Inventor 罗士平周兴蒙谢爱娟李霞章左士祥姚超
Owner CHANGZHOU UNIV
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