An iron-based rare earth oxygen storage composite solid solution adsorbent and its application in flue gas arsenic and mercury removal

An adsorbent and solid solution technology, which is applied in the field of iron-based rare earth oxygen storage composite solid solution adsorbent and its preparation, can solve the problems of strong chlorine or oxygen dependence, narrow temperature adaptation window of the adsorbent, and mismatched temperature window, etc., to achieve The effect of cost reduction, wide industry applicability, and improvement of denitrification efficiency

Active Publication Date: 2021-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide an iron-based rare earth oxygen storage type composite solid solution adsorbent and its preparation method and application, which relates to a method for integrated control of heavy metals and NOx pollutants in low-temperature / low-chlorine / low-oxygen flue gas, the purpose is to solve There are technical problems such as mismatched temperature window for simultaneous oxidation and removal of heavy metal arsenic and mercury, narrow temperature adaptation window of adsorbent, strong dependence on chlorine or oxygen in flue gas, etc. At the same time, it has certain synergistic denitrification activity and can prevent arsenic poisoning of SCR catalyst

Method used

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  • An iron-based rare earth oxygen storage composite solid solution adsorbent and its application in flue gas arsenic and mercury removal
  • An iron-based rare earth oxygen storage composite solid solution adsorbent and its application in flue gas arsenic and mercury removal
  • An iron-based rare earth oxygen storage composite solid solution adsorbent and its application in flue gas arsenic and mercury removal

Examples

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Embodiment 1

[0032] Fe prepared by co-precipitation 0.30 Ce 0.37 La 0.33 o 1.685 Adsorbent, according to the following steps: 0.5mol of Ce(NO 3 ) 3 ·6H 2 O was dissolved in deionized water, and then 0.5 mol of H was added 2 o 2 , stirred for 30 minutes, weighed polyethylene glycol with a mass ratio of 1:1 to the theoretical yield of the adsorbent, added to the above solution and stirred to dissolve. Then weigh 0.3mol of La(NO 3 ) 3 ·6H 2 O and 1.2mol of Fe(NO 3 ) 3 9H 2 O was added to the above solution and stirred until dissolved to obtain a precursor solution. Will (NH 4 ) 2 CO 3 The mixed solution with a molar ratio of 1:1 to ammonia water was added dropwise to the precursor solution while stirring until the pH value of the mixed solution was 9.5. Stand at room temperature for aging, then centrifuge, and fully wash the filter cake with deionized water to obtain the precursor of the adsorbent. The precursor is dried in a constant temperature drying oven at 100°C, and th...

Embodiment 2

[0038] Preparation of Fe by co-precipitation method 0.44 Ce 0.25 La 0.23 PR 0.08 o 1.625 Adsorbent, according to the following steps: 0.4mol of Ce(NO 3 ) 3 ·6H 2 O was dissolved in deionized water, and then 0.4 mol of H was added 2 o 2 , stirred for 30 minutes, weighed polyethylene glycol with a mass ratio of 1:1 to the theoretical yield of the adsorbent, added to the above solution and stirred to dissolve. Then weigh 0.3mol of La(NO 3 ) 3 ·6H 2 O, 0.1mol of Pr(NO 3 ) 3 ·6H 2 O and 0.8mol Fe(NO 3 ) 3 9H 2 O was added to the above solution and stirred until dissolved to obtain a precursor solution. Will (NH 4 ) 2 CO 3 The mixed solution with a molar ratio of 1:1 to ammonia water was added dropwise to the precursor solution while stirring until the pH value of the mixed solution was 8.5. Stand at room temperature for aging, then centrifuge, and fully wash the filter cake with deionized water to obtain the precursor of the adsorbent. The precursor is dried i...

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Abstract

The invention discloses an iron-based rare earth oxygen storage type composite solid solution adsorbent. The iron-based rare earth oxygen storage type composite solid solution adsorbent comprises Fe x Ce y La z PR m Y n o (3x+4y+3z+3m+3n) / 2 , x+y+z+m+n=100%. The preparation method comprises the following steps: 1) dissolving the cerium salt in water, adding an oxidizing agent, and stirring to obtain a mixed solution; 2) adding a polyethylene glycol dispersant to the mixed solution obtained in step 1) to dissolve, and then adding lanthanum Salt, iron salt, praseodymium salt or yttrium salt are stirred until dissolved to obtain a precursor solution; 3) adding the precipitant dropwise to the precursor solution obtained in step 2) until the pH value is between 8-10, aged at room temperature, separated, Obtain the precursor of the adsorbent; 4) dry and calcinate the precursor obtained in step 3) to obtain an iron-based rare earth oxygen storage type composite solid solution adsorbent, which is contacted with the flue gas through a fixed bed, a fluidized bed or a particle spraying method, To achieve the purpose of efficient and integrated control of heavy metal and NOx emissions even under low temperature / low chlorine / low oxygen flue gas conditions.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollutant control, and specifically relates to an iron-based rare earth oxygen storage type composite solid solution adsorbent and its preparation method and application. Efficient integrated control of heavy metals and NO under low temperature / low chlorine / low oxygen flue gas conditions x purpose of discharge. Background technique [0002] NOx and heavy metals released during coal utilization are important causes of air pollution. A typical 1000MW coal-fired power plant emits 500 tons of soot and 10,000 tons of SO 2 , 10,200 tons of NO x , 170 pounds of mercury, and 225 pounds of arsenic. In addition to coal-fired power plants, key energy-consuming industries such as coal coking, coke ironmaking, non-ferrous smelting, and cement kilns are also major sources of air pollution. Heavy metal pollution prevention and control technologies that are widely adaptable to the above-mentioned different w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06C01F17/32C01F17/10C01G49/02B01D53/81B01D53/64B01D53/56B01D53/02B01J20/30
CPCB01D53/02B01D53/56B01D53/64B01D53/81B01D2257/40B01D2257/55B01D2257/602B01J20/06C01G49/02
Inventor 张凯华王传风张锴
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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