A mechanic insight into low-temperature catalytic combustion toward ethylene oxide over Pt-Ru/CuCeO_(x) bimetallic catalyst  

作　　者：Wenxi Zhou Kai Chen Quanli Ke Haoru Wang Xiao Chen Yufeng Liu Guokai Cui Xiaole Weng Ying Zhou Hanfeng Lu 

机构地区：[1]Institute of Catalytic Reaction Engineering,College of Chemical Engineering,Zhejiang University of Technology,Huzhou 313200,China [2]Department of Safety and Environmental Protection,Pharmaceutical College,Jinhua Polytechnic,Jinhua 321017,China [3]Key Laboratory of Environment Remediation and Ecological Health,Ministry of Education,College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058,China

出　　处：《Journal of Rare Earths》2023年第6期881-888,I0003,共9页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(22208300,22078294,21922607);Natural Science Foundation of Zhejiang Province(LZ21E080001,LGF20E080018).

摘　　要：The catalytic oxidation performance toward ethylene oxide(EO)and the consequent mechanism were investigated on the Pt-Ru/CuCeO_(x)bimetallic catalyst,which was prepared by a distinct method combining stepwise adsorption and subsequent impregnation.The catalytic tests show that the introduction of Ru into the Pt catalyst,so as to form Pt-Ru bimetallic active sites,can greatly increase the oxidation activity of the catalyst,as evidenced by the extremely lower full oxidation temperature(120℃)when compared with that of the Pt/CeO_(2) catalyst(160℃).The XPS spectra show that the Ru species(mainly RuO_(x))have strong interaction with the CuCeO_(x) support,which can therefore affect the electron transfer between the Pt species and the support.As a result,the oxygen activation on Pt species is obviously facilitated and catalytic activity is enhanced.Finally,in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTs)was used to track the reaction mechanism.It is found that the catalytic oxidation process follows the MvK catalytic mechanism at low temperature and the L-H catalytic mechanism when the temperature moves to higher range.

关 键 词：Ethylene oxide Bimetallic catalyst Catalytic oxidation Degradation pathway Mechanism Rare earths 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]