摘要
采用等体积浸渍法制备了单贵金属Ru/TiO2和双金属Ru-Ce/TiO2系列催化剂,测试了其对氯苯的催化活性,并通过N2吸脱附、扫描电镜(SEM)、程序升温还原(H2-TPR)进行表征,旨在考察稀土元素Ce掺杂对Ru/TiO2催化氯苯性能的影响。结果表明,Ce的引入可使其在降低贵金属含量的基础上仍保持高的催化效率,且极大地提高了低温催化活性。0.4%Ru-1.0%Ce/TiO2与0.4%Ru/TiO2相比,其T10和T90分别降低了50℃和60℃。H2-TPR表明引入Ce为催化剂提供了更多的表面氧空位,形成Ru-O-Ce增强了其氧化还原能力。掺杂Ce未改变Ru/TiO2催化剂的结构形貌,仍保持介孔结构,但若负载量过多,会堵塞部分孔道,阻碍污染物吸附及反应,降低催化性能。
A single metal Ru/TiO2 catalyst and a Ru-Ce/TiO2 catalyst were prepared by the equal-volume impregnation method to investigate their effect on the catalytic oxidation of chlorobenzene.The catalysts were characterized by N2-desorption,SEM and H2-TPR,which were used to investigate the effect of Ce doping on the catalytic oxidation of chlorobenzene.The results show that the introduction of Ce can maintain high catalytic efficiency while reducing the content of precious metals,and greatly improve the catalytic activity at low temperatures.Compared with the 0.4%Ru/TiO2,T10 and T90 of the 0.4%Ru-1.0%Ce/TiO2 decreased by 50℃and 60℃,respectively.H2-TPR results showed that the introduction of Ce provided more surface oxygen vacancies on the catalyst,and the formation of Ru-O-Ce enhanced its REDOX capacity.The structure and morphology of the Ru/TiO2 catalyst did not change with the Ce doping,and the mesoporous structure of the catalysts maintained.However,if the content of Ce was too large,some pores on the catalysts could be blocked,which would decrease the adsorption of pollutants and catalytic reaction,and its catalytic performance would be reduced.
作者
梁文俊
朱玉雪
石秀娟
孙慧频
任思达
LIANG Wenjun;ZHU Yuxue;SHI Xiujuan;SUN Huipin;REN Sida(Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology,Beijing 100124,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第8期3585-3593,共9页
CIESC Journal
基金
国家重点研发计划项目(2016YFC0204300)
北京市科技重大专项(Z191100009119002)。
