CO oxidation on Ta-Modified SnO₂ solid solution catalysts

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• 作者：Xue Han ; Xianglan Xu ; Wenming Liu ; Xiang Wang ; ^{xwang23@ncu.edu.cn} ; ^{wangdp69@gmail.com} ; Rongbin Zhang ; ^{rbzhang@ncu.edu.cn}
• 关键词：SnO2 catalyst ; Tantala ; Solid solution ; CO oxidation
• 刊名：Solid State Sciences
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：20
• 期：Complete
• 页码：103-109
• 全文大小：1416 K

文摘

Co-precipitation method was adopted to prepare Sn-Ta mixed oxide catalysts with different Sn/Ta molar ratios and used for CO oxidation. The catalysts were investigated by N₂-Brunauer-Emmett-Teller (N₂-BET), X-ray diffraction patterns (XRD), H₂-temperature programmed reduction (H₂-TPR), Thermal Gravity Analysis - Differential Scanning Calorimetry (TGA-DSC) techniques. It is revealed that a small amount of Ta cations can be doped into SnO₂ lattice to form solid solution by co-precipitation method, which resulted in samples having higher surface areas, improved thermal stability and more deficient oxygen species on the surface of SnO₂. As a result, those Sn rich Sn-Ta solid solution catalysts with an Sn/Ta molar ratio higher than 4/2 showed significantly enhanced activity as well as good resistance to water deactivation. It is noted here that if tantala disperses onto SnO₂ surface instead of doping into its lattice, it will then have negative effect on its activity.