文献类型：期刊文献

中文题名：Development of LnMnO_(3+σ) perovskite on low temperature Hg0 removal

作者：Qicheng Shen[1];Jiacheng Zhou[1];Chenglong Ma[1];Jie Yang[1];Limei Cao[1,2];Ji Yang[1,2]

机构：[1]School of Resources and Environmental Engineering,State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,East China University of Science and Technology,Shanghai 200237,China;[2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China

年份：2022

卷号：34

期号：3

起止页码：141

中文期刊名：Journal of Environmental Sciences

外文期刊名：环境科学学报（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；PubMed;

基金：This work was supported by the National Natural Science Foundation of China(No.51778229);the Fundamental Research Funds for the Central Universities(No.JKB012015019).

语种：英文

中文关键词：Hg^(0)removal;Manganese oxide;Perovskite;Rare earth element

摘要：LnMnO_(3+σ)(Ln=La,Pr,Nd,Sm,Eu,Gd or Dy)perovskites synthesized by sol-gel method were employed for gaseous elemental mercury(Hg^(0))removal from coal-fired flue gas.Characterization results revealed the structure of the perovskites presented a phase transition process from rhombohedral system to O-and O'-orthorhombic structure with the change of A-site rare earth elements.The perovskites showed satisfactory Hg^(0) removal capacity in a narrow temperature range of 100-150℃.NdMnO_(3+σ) with an O-O'orthorhombic structure presented the best Hg^(0) removal performance,which markedly depends on four factors:crystal structure,oxygen vacancy density,Mn^(4+)/Mn^(3+) ratio and surface element segregation.The Hg^(0) removal mechanism was illustrated based on the mercury temperature programmed desorption experiment and X-ray photoelectron spectroscopy characterization.Both chemisorption and catalytic oxidation played a role in the Hg^(0) removal process.Chemisorption dominated the Hg^(0) removal,due to the slow catalytic oxidation rate at low temperature.This work preliminarily established the relation between the structure of rare earth manganese perovskite and Hg^(0) removal performance.