标题：Effect of reduction-oxidation treatment on structure and catalytic properties of ordered mesoporous Cu-Mg-Al composite oxides
作者：Lu, Jingting; Zhang, Yan; Jiao, Chengli; Megarajan, Suresh Kumar; Gu, Dong; Yang, Guocheng; Jiang, Heqing; Jia, Chunjiang; Schueth, Fe 更多 作者机构：[Lu Jingting] School of Chemistry and Life Science, Changchun University of Technology, Key Laboratory of Biobased Materials Chinese Academy of Scienc 更多
通讯作者地址：[Yang, GC]Changchun Univ Technol, Sch Chem & Life Sci, Changchun 130012, Peoples R China.
关键词：Cu-Mg-Al oxides; Evaporation-induced self-assembly; Mesoporous; materials; Migration; CO oxidation
摘要：Ordered mesoporous Cu-Mg-Al composite oxides were synthesized via the one-pot evaporation-induced self-assembly strategy. Using this method, copper was first homogeneously incorporated into the ordered mesoporous spinel matrix. After H-2 reduction treatment, according to X-ray diffraction (XRD) and transmission electron microscopy (TEM) results, copper existed as metallic nanoparticles with the size of 6-10 nm that well decorated the parent mesoporous skeleton. The metallic nanoparticles were then re-oxidized to copper oxide when exposed to air or during CO oxidation reaction at low temperatures. Thus, copper migrated from bulk spinel phase to the surface after the reduction-oxidation treatment. Moreover, the copper on the surface was re-incorporated into the bulk spinel phase by further thermal treatment at much higher temperature in the presence of air. The correlation between the state of copper in the mesoporous composite oxides and the catalytic performance toward CO oxidation was studied. It was found that copper existed as oxide nanoparticles on the surface of mesoporous Mg-Al skeleton is much more active than that existed as lattice Cu ions in spinel phase.