Se掺杂改性对Pt/TiO_(2)催化剂结构及其CO催化性能的影响  

Effect of Se doping modification on structure of Pt/TiO_(2)catalyst and its CO catalytic performance

作　　者：龚天龙 刘弼华 张志波[2] 黄国军 梁明华 赵利明 康建刚[3,4] GONG Tianlong;LIU Bihua;ZHANG Zhibo;HUANG Guojun;LIANG Minghua;ZHAO LIMing;KANG Jiangang(Baosteel Zhanjiang Iron and Steel Co.,Ltd.,Zhanjiang 524072,Guangdong,China;Zhongye Changtian International Engineering Co.,Ltd.,Hunan Zhongye Changtian Energy Conservation and Environmental Protection Technology Co.,Ltd.,Changsha 410205,Hunan,China;Zhongye Changtian International Engineering Co.,Ltd.,Engineering Technology Research Center,Changsha 410205,Hunan,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410006,China)

机构地区：[1]宝钢湛江钢铁有限公司,广东湛江524072 [2]中冶长天国际工程有限责任公司,湖南中冶长天节能环保技术有限公司,湖南长沙410205 [3]中冶长天国际工程有限责任公司工程技术研究中心,湖南长沙410205 [4]中南大学粉末冶金国家重点实验室,湖南长沙410006

出　　处：《烧结球团》2024年第6期96-103,共8页Sintering and Pelletizing

基　　金：国家重点研发计划重点专项资助项目(2021YFB3500600);湖南省创新平台与人才计划资助项目(2020RC4027)。

摘　　要：Pt/TiO_(2)催化剂已被用于环境中CO的催化氧化,其在工业烟气CO排放治理方面取得了许多进展。本文通过制备不同Se含量掺杂的Pt/TiO_(2)催化剂,利用SEM(EDS)、XRD检测手段研究Pt/TiO_(2)催化剂的结构组成和微观形貌,通过XPS、CO-TPD和H_(2)-TPR检测手段研究催化剂表面的元素价态,总结Se掺杂对Pt/TiO_(2)催化剂性能的影响机制。结果表明:Se的掺杂促进了金属-载体中的电子转移,增加了Ti^(3+)和氧空位,有利于活性氧的流动;同时,Se的掺杂增强了催化剂的强金属-载体相互作用(strong metal-support interaction,SMSI)效应,促进电子由Pt向Se移动,使Pt的价态升高,增加了活性位点中的PtO_(x)含量,使反应的活性氧增多。催化剂性能测试结果发现,掺杂0.1%Se时,Pt/TiO_(2)催化剂的CO催化氧化性能最佳。Pt/TiO_(2)catalyst has been used for catalytic oxidation of CO in the environment,and many progresses have been made in the treatment of CO emission from industrial gas.Pt/TiO_(2)catalysts doped with different Se contents are prepared,the structure and microscopic morphology of Pt/TiO_(2)catalysts are studied by SEM(EDS)and XRD detection,and the elemental valence state on the surface of the catalysts are studied by XPS,CO-TPD and H_(2)-TPR detection methods,and the influence mechanism of Se doping on the performance of Pt/TiO_(2)catalysts is summarized.The results show that Se doping promotes electron transfer in metal-support,increases Ti^(3+)and oxygen vacancies,and is conducive to the flow of reactive oxygen.At the same time,the Se doping enhances the strong metal-support interaction(SMSI)effect of the catalyst,promotes the movement of electrons from Pt to Se,increases the valence state of Pt,increases the content of PtO_(x) in the active site,and increases the reactive oxygen of the reaction.The results of catalyst performance test show that when the Pt/TiO_(2)catalyst is doped with 0.1%Se,it gets the best CO catalytic oxidation performance.

关 键 词：CO催化氧化 Pt/TiO_(2)催化剂 改性 Se掺杂 

分 类 号：X701.7[环境科学与工程—环境工程] O643.36[理学—物理化学]