Source Journal of CSCD
Source Journal for Chinese Scientific and Technical Papers
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Volume 40 Issue 2
Apr.  2022
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XIE Chenghao, GAO Lihua, ZHAN Wenlong, XIAO Dechao, HE Zhijun, ZHANG Junhong. EXPERIMENTAL STUDY ON SIMULTANEOUS DENITRATION AND DESULFURIZATION BY FLY ASH AND CARBIDE SLAG SUPPORTED Na2O UNDER MICROWAVE FIELD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(2): 81-87. doi: 10.13205/j.hjgc.202202013
Citation: XIE Chenghao, GAO Lihua, ZHAN Wenlong, XIAO Dechao, HE Zhijun, ZHANG Junhong. EXPERIMENTAL STUDY ON SIMULTANEOUS DENITRATION AND DESULFURIZATION BY FLY ASH AND CARBIDE SLAG SUPPORTED Na2O UNDER MICROWAVE FIELD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(2): 81-87. doi: 10.13205/j.hjgc.202202013

EXPERIMENTAL STUDY ON SIMULTANEOUS DENITRATION AND DESULFURIZATION BY FLY ASH AND CARBIDE SLAG SUPPORTED Na2O UNDER MICROWAVE FIELD

doi: 10.13205/j.hjgc.202202013
  • Received Date: 2021-05-26
    Available Online: 2022-04-02
  • Publish Date: 2022-04-02
  • In this paper, the mixture of fly ash and carbide slag(FC) was used as the carrier, Na2O as the active component, and the adsorbent x% Na2O/FC(x% represents the mass ratio of active component Na2O in the adsorbent) was prepared by ultrasonic impregnation method. The adsorbents were characterized by XRD, BET and SEM, and the mechanism of simultaneous desulfurization and denitration of adsorbents under microwave radiation was discussed. The results showed that Na2O loading under microwave significantly improved the performance of the adsorbent. Simultaneous desulfurization and denitrification performance of 6%Na2O/FC was the best. The desulfurization t90% and t50%(tx% was the reaction time when the desulfurization rate of adsorbents or the denitrification rate reached x%) were 12 min and 73 min, and the denitrification t90% and t50% were 4 min and 16 min. The mechanism analysis showed that the simultaneous desulfurization and denitration process was dominated by physical adsorption at first, and chemical adsorption after a period of reaction. The chemisorption process of Na2O/FC adsorbent under microwave was found as follows: SO2 and NO were oxidized into SO3 and N2O5 by active oxygen species, and SO3 and N2O5 reacted with metal oxides to generate sulfates and nitrates such as Ca5(SiO4)2SO4,(MgxCa1-x)(NO3)2 and CaSO4. At the same time, the active component Na2O directly reacted with the adsorbed SO2 and NO to form Na2SO3 and NaNO3.
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