Effect of titania polymorph on the properties of CuO/TiO₂ catalysts for trace methane combustion

详细信息    查看全文

• 作者：Zebao Rui^a ; Yifu Huang^a ; Yu Zheng^a ; Hongbing Ji^a ; ^{jihb@mail.sysu.edu.cn} ; Xiang Yu^b
• 关键词：Copper oxide ; P25 ; Anatase ; Rutile ; Surface structure ; Methane combustion
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：372
• 期：Complete
• 页码：128-136
• 全文大小：1192 K

文摘

Anatase and rutile have the same chemical composition as TiO₂ but different crystalline structures and surface structures, which draws effect on the properties of their supported catalysts. Additionally, titania mixture, e.g., Degussa P25, which consists of both anatase and rutile, presents different physicochemical properties with anatase and rutile. In this work, P25-, anatase- or rutile-supported copper oxide catalysts (signed as CuO/P25, CuO/A and CuO/R) were prepared and characterized to study the titania support effect on the physicochemical properties and catalytic properties for the trace CH₄ combustion. It is found that the activity of CuO/R is better than the corresponding CuO/A sample when their pore size and specific surface area are comparable, which is attributed to the different chemical states of the copper oxide caused by the different TiO₂ support polymorphs. The loading of CuO and subsequent calcination promotes more significant sintering and anatase to rutile transform for CuO/P25 than those for CuO/A. Thus, CuO/R shows better stability than CuO/P25.