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A kind of denitrification and demercury composite catalyst and preparation method thereof

A technology of composite catalyst and co-catalyst, which is applied in the direction of catalyst carrier, chemical instrument and method, organic compound/hydride/coordination complex catalyst, etc. It can solve the problems of simultaneous denitrification treatment, high cost of use, and non-regeneration of adsorbent Recycling and other issues to achieve good adsorption and dispersion, strong resistance to SO2 poisoning, and improved activity and catalytic efficiency

Active Publication Date: 2017-01-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorbent disclosed in the above invention patent still has obvious defects and deficiencies: first, the adsorbent can only be used for the removal of elemental mercury, and cannot be used for denitrification at the same time; second, the adsorbent cannot be regenerated and recycled, and the use cost is relatively high

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  • A kind of denitrification and demercury composite catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] Weigh 20g of chitosan, add it into 100ml, 1mol / L acetic acid solution, and stir with a magnetic stirrer for 12 hours, so that the chitosan is completely dissolved into a yellow viscous suspension. 0.588g MnO 2 and 8.823g TiO 2 into the solution, and use 10mol / L NaOH to adjust the pH value of the mixed solution to 10. The mixed solution was thoroughly stirred on a magnetic stirrer for 30 minutes, and dispersed using ultrasonic waves for 1 hour. The mixed solution was transferred into an autoclave built with polytetrafluoroethylene, and hydrothermally reacted at 160° C. for 24 hours. After the reaction, the product was centrifugally washed 5 times with distilled water and 2 times with absolute ethanol, and vacuum-dried at 60° C. for 12 hours to constant weight to obtain the catalyst. Its composition is 30% TiO 2 , 68% chitosan and 2% MnO 2 . The characteristics of the catalyst are: the specific surface area is 95m 2 / g, pore volume 0.28cm 3 / g, pore size 10.62nm. ...

Embodiment 2

[0024] Weigh 20g of chitosan, add it into 200ml, 2mol / L acetic acid solution, and stir with a magnetic stirrer for 10 hours, so that the chitosan is completely dissolved into a yellow viscous suspension. 1.052g CuO and CeO 2 Mixture, 14.035g TiO 2 Add it into the solution, and use 15mol / L NaOH to adjust the pH value of the mixed solution to 12. The mixed solution was thoroughly stirred on a magnetic stirrer for 60 minutes, and dispersed using ultrasonic waves for 2 hours. The mixed solution was transferred into an autoclave built with polytetrafluoroethylene, and subjected to hydrothermal reaction at 140° C. for 20 hours. After the reaction, the product was centrifugally washed 5 times with distilled water and 2 times with absolute ethanol, and vacuum-dried at 50° C. for 10 hours to constant weight to obtain the catalyst. Its composition is 40% TiO 2 , 57% chitosan and 3% CuO and CeO 2 . The characteristics of the catalyst are: the specific surface area is 101m 2 / g, po...

Embodiment 3

[0026] Weigh 20g of chitosan, add it into 100ml, 2mol / L acetic acid solution, and stir with a magnetic stirrer for 11 hours, so that the chitosan is completely dissolved into a yellow viscous suspension. 0.968g MnO 2 and CeO 2 Mixture, 11.291g TiO 2 Add into the solution, and use 10mol / L NaOH to adjust the pH value of the mixed solution to 9. The mixed solution was thoroughly stirred on a magnetic stirrer for 45 minutes, and dispersed using ultrasonic waves for 2 hours. The mixed solution was transferred into an autoclave built with polytetrafluoroethylene, and hydrothermally reacted at 130° C. for 22 hours. After the reaction, the product was centrifugally washed 5 times with distilled water and 2 times with absolute ethanol, and vacuum-dried at 40° C. for 11 hours to constant weight to obtain the catalyst. Its composition is 35% TiO 2 , 62% chitosan and 3% MnO 2 and CeO 2 . The characteristics of the catalyst are: the specific surface area is 120m 2 / g, pore volume ...

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Abstract

The present invention discloses a composite catalyst for denitration and demercuration. The composite catalyst comprises, by mass, 30-40% of TiO2, 57-68% of chitosan, and 2-3% of an assistant catalyst, wherein the assistant catalyst is one or a combination selected from CuO, MnO2 and CeO2. The catalyst preparation method comprises: (1) adding 57-68 parts by mass of chitosan to an acetic acid solution, and stirring to completely dissolve; (2) adding 30-40 parts by mass of TiO2 and 2-3 parts by mass of an assistant catalyst to the chitosan acetic acid solution, adopting a NaOH solution to adjust the pH value to 9-12, and adopting magnetic stirring and ultrasonic dispersion to uniformly mix; and (3) adopting an autoclave to carry out a hydrothermal synthesis reaction, and carrying out centrifugation washing and vacuum drying to obtain the catalyst. The catalyst of the present invention can be applied for the denitration and demercuration reaction, and has characteristics of high catalysis efficiency, strong anti-SO2 toxicity, low raw material cost and regeneration use.

Description

technical field [0001] The invention relates to the field of prevention and control of atmospheric pollutants in coal-fired power stations, in particular to a method for simultaneously removing mercury and NO from coal-fired flue gas x Gas organic-inorganic composite catalyst and its preparation process. Background technique [0002] The large-scale utilization of coal provides convenience for human production and life, but the air pollutants emitted during the coal burning process, such as NO x And heavy metal mercury, etc., the threat to the environment can not be ignored. NO x It is an important precursor of the greenhouse effect, photochemical smog, acid rain and ozone layer destruction; and although the content of heavy metal mercury is very small, it is extremely harmful to the human body due to its volatility, toxicity and bioaccumulation characteristics. In my country's latest national standard (GB 13223-2011), it is clearly pointed out that the emission of nitrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J32/00B01J35/10B01D53/56B01D53/86
Inventor 苏胜宋尧向军王鹏鹰曹蕃胡松孙路石
Owner HUAZHONG UNIV OF SCI & TECH
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