Chemical interaction of Ce-Fe mixed oxides for methane selective oxidation

作     者：祝星 杜云鹏 王华 魏永刚 李孔斋 孙令玥 ZHU Xing;DU Yunpeng;WANG Hua;WEI Yonggang;LI Kongzhai;SUN Lingyue

作者机构：State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Faculty of Chemical Engineering Kunming University of Science and Technology 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2014年第32卷第9期

页      面：824-830页

核心收录：

学科分类：081704[工学-应用化学] 081705[工学-工业催化] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Project supported by National Natural Science Foundation of China(51204083,51374004,51104074,51174105,51306084) the Applied Basic Research Program of Yunnan Province(2012FD016) the Candidate Talents Training Fund of Yunnan Province(2012HB009) 

主　　题：chemical interaction Ce-Fe mixed oxides methane selective oxidation rare earths 

摘      要：Chemical interaction of Ce-Fe mixed oxides was investigated in methane selective oxidation via methane temperature programmed reduction and methane isothermal reaction tests over Ce-Fe oxygen carriers. In methane temperature programmed reduction test, Ce-Fe oxide behaved complete oxidation at the lower temperature and selective oxidation at higher temperatures. Ce-Fe mixed oxides with the Fe content in the range of 0.1~）.5 was able to produce syngas with high selectivity in high-temperature range （800-900 ~C）, and a higher Fe amount over 0.5 seemed to depress the CO formation. In isothermal reaction, complete oxidation oc- curred at beginning following with selective oxidation later. Ce~_xFexO2~ oxygen carriers （x5_0.5） were proved to be suitable for the selective oxidation of methane. Ce-Fe mixed oxides had the well-pleasing reducibility with high oxygen releasing rate and CO selec- tivity due to the interaction between Ce and Fe species. Strong chemical interaction of Ce-Fe mixed oxides originated from both Fe＊ activated CeO2 and Ce3＋ activated iron oxides （FeOm）, and those chemical interaction greatly enhanced the oxygen mobility and selectivity.