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CuO/attapulgite catalytic adsorber and method of removing elementary mercury from flue gas by using the adsorber

A technology of attapulgite and adsorbent, which is applied in the preparation of catalytic adsorbent and flue gas mercury removal, which can solve the problems of large-scale industrial application of activated carbon, high operating cost, and inability to effectively regenerate and use, etc., to achieve high catalytic oxidation The effect of activity and adsorption capacity, avoiding secondary pollution, reducing preparation cost and operating cost

Inactive Publication Date: 2016-12-21
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the adsorption of mercury by activated carbon is greatly affected by the flue gas temperature and flue gas composition, and cannot be effectively regenerated and used, the operating cost is high, which limits the large-scale industrial application of activated carbon.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An equal volume of 10 g of attapulgite carrier was impregnated in 6 mL of 0.040 g / mL Cu(NO 3 ) 2 solution, stirred evenly, placed in air for 10 hours, dried at 50°C for 5 hours, dried at 110°C for 5 hours, then calcined at 350°C for 3 hours in a nitrogen atmosphere, and 300°C for 2 hours in an air atmosphere to obtain CuO / concave-convex with a CuO loading of 1wt%. Rodstone catalytic adsorbent.

[0022] The CuO / attapulgite catalytic adsorbent was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalytic adsorbent is heated up to 150°C in the reactor, the temperature is kept constant, and the Hg-containing 0 Simulated flue gas, air velocity 6000h -1 . The simulated flue gas composition is: 6%O 2 , 5%H 2 O, 1500ppmSO 2 , N 2 is the balance gas, Hg 0 The concentration is 20μg / m 3 . Constant temperature adsorption reaction 4h, Hg 0 The removal efficiency is 53%.

Embodiment 2

[0024] An equal volume of 10 g of attapulgite carrier was impregnated in 6 mL of 0.32 g / mL Cu(NO 3 ) 2 solution, stirred evenly, placed in air for 12h, dried at 40°C for 8h, dried at 90°C for 8h, then calcined at 400°C for 4h in a nitrogen atmosphere, and calcined at 350°C for 2h in an air atmosphere to obtain CuO / concave-convex with a CuO loading of 8wt%. Rodstone catalytic adsorbent.

[0025] The CuO / attapulgite catalytic adsorbent was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. The catalytic adsorbent was heated to 160°C in the reactor and kept at a constant temperature, and the Hg-containing 0 Simulated flue gas, air velocity 10000h -1 . The simulated flue gas composition is: 6%O 2 , 5%H 2 O, 1500ppmSO 2 , N 2 is the balance gas, Hg 0 The concentration is 80μg / m 3 . Constant temperature adsorption reaction 4h, Hg 0 The removal efficiency is 76%.

Embodiment 3

[0027] An equal volume of 10 g of attapulgite support was impregnated in 6 mL of 0.20 g / mL Cu(NO 3 ) 2 solution, stirred evenly, placed in air for 15h, dried at 80°C for 4h, dried at 130°C for 4h, then calcined at 500°C for 3h in a nitrogen atmosphere, and at 300°C for 3h in an air atmosphere to obtain CuO / concave-convex with a CuO loading of 5wt%. Rodstone catalytic adsorbent.

[0028] The CuO / attapulgite catalytic adsorbent was packed in a fixed-bed quartz tube reactor, and both ends were fixed with quartz wool. After the catalytic adsorbent is heated up to 200°C in the reactor, the temperature is maintained at a constant temperature, and the Hg-containing 0 Simulated flue gas, air velocity 6000h -1 . The simulated flue gas composition is: 6%O 2 , 5%H 2 O, 1500ppmSO 2 , N 2 is the balance gas, Hg 0 The concentration is 20μg / m 3 . Constant temperature adsorption reaction 4h, Hg 0 The removal efficiency is 59%.

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Abstract

The invention discloses preparation of a CuO / attapulgite catalytic adsorber and a method of removing elementary mercury from flue gas by using the adsorber. The CuO / attapulgite catalytic adsorber is prepared with the attapulgite as a carrier and CuO as an active component. A preparation method includes the steps of: impregnating the attapulgite carrier in a copper salt precursor solution, stirring the mixture uniformly, allowing the mixture to stand and drying the mixture; successively calcining the attapulgite carrier in a nitrogen atmosphere and an air atmosphere to prepare the CuO / attapulgite catalytic adsorber. The method of removing elementary mercury from flue gas includes the steps of placing the catalytic adsorber in a fixed bed reactor, setting the temperature to be 150-250 DEG C, and feeding mercury-containing flue gas under normal temperature. Compared with the prior art, the catalytic adsorber has high catalytic activity and low energy consumption, low raw material cost and simple preparation method, can be recycled and reused and avoids secondary pollution.

Description

technical field [0001] The invention belongs to the field of preparation of catalytic adsorbent and flue gas mercury removal, and in particular relates to CuO / attapulgite catalytic adsorbent and its method for removing elemental mercury in flue gas. Background technique [0002] my country is the largest coal consumer, and coal accounts for more than 50% of my country's primary energy structure, and my country's energy consumption will still be dominated by coal for a long period of time in the future. A large number of pollutants are produced in the process of coal combustion, among which the pollution of heavy metal mercury has attracted widespread attention. my country's annual mercury emissions account for about 25-40% of the global total mercury emissions, among which coal-fired power plants are one of the largest sources of anthropogenic mercury emissions. Mercury is a volatile trace element with long-distance migration ability, which can cause serious and long-lastin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30B01D53/86B01D53/64B01J23/72B01D53/02
CPCB01J20/12B01D53/8665B01D2253/10B01D2258/0283B01J23/72
Inventor 王钧伟张先龙张庆平陶海兵董彦杰沈园园方雯
Owner ANQING NORMAL UNIV
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