LaMnO_(3)钙钛矿型复合氧化物催化氧化燃煤烟气单质汞的性能研究  

Performance Study on the Catalytic Oxidation of Elemental Mercury in Coal-fired Flue Gas Using LaMnO_(3)

作　　者：彭德骏 周子健[1] 曹田田 周玥 刘磊[1] 刘小伟[1] 徐明厚[1] PENG Dejun;ZHOU Zijian;CAO Tiantian;ZHOU Yue;LIU Lei;LIU Xiaowei;XU Minghou(State Key Laboratory of Coal Combustion,Huazhong University of Science&Technology,Wuhan 430074,China;SINOPEC Research Institute of Petroleum Processing,Beijing 100083,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074 [2]中国石化石油化工科学研究院,北京100083

出　　处：《动力工程学报》2023年第10期1371-1376,共6页Journal of Chinese Society of Power Engineering

基　　金：湖北省自然科学基金资助项目(2022CFB113);国家自然科学基金资助项目(52036003)。

摘　　要：为充分利用锰氧化物在低温下的高活性以及钙钛矿结构较强的表面活性氧流动能力,采用合成的LaMnO_(3)来处理燃煤烟气中的汞,并对合成的LaMnO_(3)进行一系列的物理化学特征表征。结果表明:催化剂比表面积较小,但其表面的氧浓度高于理论值,且锰离子呈+3价与+4价的混合价态;催化剂表面可参与汞氧化过程的的活性氧较少,但流动性较强,体积分数3%的O2足够使催化剂维持高氧化率;HCl可以显著增强催化剂对单质汞的催化氧化活性,说明催化剂表面的大部分氧物种均可与HCl反应生成有利于单质汞氧化的活性氯。In order to make full use of the high activity of manganese oxide at low temperature and the strong surface-active oxygen flow ability of perovskite structure,the synthesized LaMnO_(3)was used to treat mercury in coal-fired flue gas,and a series of physicochemical features of the synthesized LaMnO_(3)were characterized.Results show that the specific surface area is low,but the oxygen concentration on the catalyst surface is higher than the theoretical value.Manganese ions exhibit mixed valence state of+3 and+4.The surface of the catalyst has fewer active oxygen species that can participate in the mercury oxidation process,but it has strong fluidity.O2 with volume fraction of 3%is sufficient to maintain the catalyst with high oxidation rate.HCl can significantly enhance the catalytic oxidation activity of the catalyst on elemental mercury,indicating that most oxygen species on the catalyst surface can react with HCl to produce active chlorine that is conducive to the elemental mercury oxidation.

关 键 词：单质汞 LaMnO_(3) 燃煤烟气 氧流动性 

分 类 号：TK16[动力工程及工程热物理—热能工程]