原子层沉积制备Pt/CeO2催化剂及其低温CO氧化性能的研究  

Preparation of Pt/CeO2 catalyst via atomic layer deposition and its application in oxidation of CO at low temperature

作　　者：孟甜甜 赵世超[1] 陈朝秋[1] 梁浩杰 覃勇[1] MENG Tian-tian;ZHAO Shi-chao;CHEN Chao-qiu;LIANG Hao-jie;QIN Yong(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry of Chinese Academy of Sciences,Taiyuan 030001,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《现代化工》2020年第10期184-187,192,共5页Modern Chemical Industry

摘　　要：针对CeO2负载Pt的催化体系存在CO氧化转化温度高等问题,利用原子层沉积技术制备的Pt/CeO2催化剂可有效降低CO氧化温度,并通过改变Pt的沉积循环次数和预处理条件调控CO氧化性能,尤其是H2气氛预处理之后对CO完全氧化的温度可低至60℃。通过XRD、ICP、TEM、XPS、H2-TPR等手段对催化剂进行表征,结果表明,Pt高度分散在CeO2纳米棒表面,Pt和CeO2之间具有强的金属-载体相互作用,极大地提高了其对CO氧化反应的催化性能。Both the catalytic oxidation of CO and the development of catalysts for oxidation of CO at low temperature are very significant for basic research and industrial applications.Pt/CeO2 catalysts that are prepared via atomic layer deposition method can efficiently drop the temperature at which CO can be oxidized.The catalytic performance of Pt/CeO2 can be improved effectively by tuning the cycles of Pt ALD and pretreatment conditions.Especially,the temperature for oxidation of CO can be as low as 60℃after the catalysts are pretreated in a hydrogen atmosphere.The catalysts are characterized by XRD,ICP,TEM,XPS and H2-TPR.It is found that Pt has been highly dispersed on the surface of CeO2 nanorods,and there are strong interactions between Pt and CeO2.After pretreated by hydrogen,the adsorption of CO by Pt can be enhanced,which can improve its catalytic performance for oxidation of CO.

关 键 词：Pt/CeO2 CO氧化 原子层沉积 

分 类 号：O643.38[理学—物理化学]