Co-Cu-Mn复合氧化物催化低浓度瓦斯的燃烧性能  

Catalytic performance of Co-Cu-Mn composite oxide catalyst for combustion of low concentration gas

作　　者：朱丽华 王之钦 刘培 徐锋 Zhu Lihua;Wang Zhiqin;Liu Pei;Xu Feng(School of Safety Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学安全工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2024年第4期551-556,共6页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省自然科学基金项目(LH2022E107);黑龙江省省属高等学校基本科研业务费项目(2021-KYYWF-1463)。

摘　　要：为了探究钴、铜、锰复合氧化物催化剂催化低浓度瓦斯的燃烧性能,采用共沉淀法制备了不同物质的量比的7种Co-Cu-Mn三元复合氧化物催化剂,应用固定床微型反应器开展低浓度瓦斯催化燃烧实验,并结合SEM、BET、XRD、H 2-TPR、XPS表征评价了不同催化剂的催化活性。结果表明:钴、铜、锰物质的量比对Co-Cu-Mn三元复合催化剂催化活性有较为显著的影响,钴、铜、锰物质的量比为5∶2.5∶2.5的催化剂因孔隙结构更为发育以及具有更高的Co^(3+)、Cu^(2+)和Mn^(3+)离子占比,致使Co、Cu、Mn 3种元素价态转变过程中形成更多的氧空位,对低浓度瓦斯催化燃烧表现出更好的催化活性;此外,Co-Cu-Mn三元复合氧化物催化剂中的钴为Co_(3)O_(4)尖晶石晶体结构,锰物种在催化剂制备过程中掺杂到Co_(3)O_(4)尖晶石晶格中形成了Co-Mn固溶体,铜氧化物以无定型或高分散状态存在于催化剂表面。This paper is intended to investigate the catalytic performance of Co-Cu-Mn composite oxide for combustion of low concentration gas.The study consists of preparing seven kinds of Co-Cu-Mn ternary composite oxide catalysts with different molar ratios by coprecipitation method;conducting a low concentration gas catalytic combustion test by using a fixed bed microreactor;and characterizing and evaluating the catalytic activity of different catalysts according to SEM,BET,XRD,H 2-TPR and XPS.The results show that the molar ratio of cobalt,copper and manganese has a significant effect on the activity of Co-Cu-Mn ternary composite oxide catalyst.Due to the more developed pore structure and higher Co^(3+),Cu 6(2+)and Mn 3+ratio,the catalyst with a molar ratio of cobalt,copper and manganese of 5∶2.5∶2.5 forms more oxygen vacancies during the valence transition of Co,Cu and Mn,and shows better catalytic activity for low concentration gas combustion.In addition,the cobalt in the Co-Cu-Mn ternary composite oxide catalyst is the crystal structure of Co_(3)O_(4)spinel;the manganese species is doped into the crystal lattice of Co_(3)O_(4)spinel during the preparation of the catalyst to form Co-Mn solid solution;and the copper oxide exists on the surface of the catalyst in amorphous or highly dispersed state.

关 键 词：低浓度瓦斯 催化燃烧 复合氧化物 催化剂 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程] TQ038