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

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...

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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

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