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学科主题环境科学技术基础学科
TiO2 PROMOTION OF Ir/Al2O3 CATALYST FOR DIRECT N2O DECOMPOSITION
Liu S(刘爽); Cong Y(丛昱); Huang YQ(黄延强); Zhao XY(赵向云); Zhang T(张涛)
会议文集Abstract Book
会议名称6th International Conference on Environmental Catalysis
会议日期2010-09-12
2011
会议地点北京
其他题名TiO2促进的Ir/Al2O3催化剂用于氧化亚氮直接分解
页码138-0
出版者待补充
出版地待补充
合作性质分会口头报告
部门归属1501
主办者中国科学院生态环境研究中心
英文摘要Introduction Doping transition metal oxides or alkali and alkaline earth metal oxides into noble metal based catalysts is an extensively used method to adjust the physiochemical properties of the catalysts and improve the catalytic activities [1]. However, TiO2 doped Al2O3 catalysts have been scarcely investigated, especially for the catalytic decomposition of N2O. In this work, an obvious activity improvement on direct N2O decomposition has been obtained on Ir/AlTix catalysts, and possible reasons have been explored with different characterization techniques. The high dispersity of Ir particles and special textural features of the catalysts have been assumed to closely correlate with the high activities. Results and discussion 5 wt % Ir/AlTix catalysts with different atomic ratios of Ti/Al (x) were prepared with an impregnation method. Great improvement on the catalytic activities of direct N2O decomposition has been observed on the TiO2 doped catalysts (Fig. 1), which is obviously varied with the Ti/Al ratio. The highest activity was obtained on the Ir/AlTi1 catalyst, completely decomposing N2O at 350 oC, a fairly low temperature under the same test conditions. The reasons for the activity improvement have been detailedly investigated. The Ir particle sizes were found less than 3 nm and abundantly exposed on the surface of the doped catalyst (Fig. 2a), while the majority of Ir on the single oxide based catalysts were agglomerated into larger particles (Fig. 2b and 2c). The high dispersity of Ir particles may be responsible for the activity improvement of the TiO2 doped catalysts. More interestingly, SEM images revealed that rough surfaces with the fluffy structures were formed on the doped catalysts (Fig. 2d), in contrast, the surfaces of the single TiO2 or Al2O3 catalysts remained smooth and clean. These surface irregularities probably acted as obstacles to the immigration of Ir during the calcination process, finally resulting in the high dispersity of Ir particles as well as the high catalytic activities. Further studies on the role of TiO2 are still in progress. Fig. 1. N2O activities of TiO2 doped Ir/Al2O3 catalysts Fig. 2. TEM and SEM images Conclusions TiO2 doped Ir/Al2O3 catalysts greatly promoted the catalytic activity of direct N2O decomposition, probably due to the high dispersity of Ir particles induced by the irregular surfaces. References [1] Junhua Li, Yongqing Zhu, Rui Ke, Jiming Hao, Applied Catalysis B: Environmental 80 (2008) 202–213.; Introduction Doping transition metal oxides or alkali and alkaline earth metal oxides into noble metal based catalysts is an extensively used method to adjust the physiochemical properties of the catalysts and improve the catalytic activities [1]. However, TiO2 doped Al2O3 catalysts have been scarcely investigated, especially for the catalytic decomposition of N2O. In this work, an obvious activity improvement on direct N2O decomposition has been obtained on Ir/AlTix catalysts, and possible reasons have been explored with different characterization techniques. The high dispersity of Ir particles and special textural features of the catalysts have been assumed to closely correlate with the high activities. Results and discussion 5 wt % Ir/AlTix catalysts with different atomic ratios of Ti/Al (x) were prepared with an impregnation method. Great improvement on the catalytic activities of direct N2O decomposition has been observed on the TiO2 doped catalysts (Fig. 1), which is obviously varied with the Ti/Al ratio. The highest activity was obtained on the Ir/AlTi1 catalyst, completely decomposing N2O at 350 oC, a fairly low temperature under the same test conditions. The reasons for the activity improvement have been detailedly investigated. The Ir particle sizes were found less than 3 nm and abundantly exposed on the surface of the doped catalyst (Fig. 2a), while the majority of Ir on the single oxide based catalysts were agglomerated into larger particles (Fig. 2b and 2c). The high dispersity of Ir particles may be responsible for the activity improvement of the TiO2 doped catalysts. More interestingly, SEM images revealed that rough surfaces with the fluffy structures were formed on the doped catalysts (Fig. 2d), in contrast, the surfaces of the single TiO2 or Al2O3 catalysts remained smooth and clean. These surface irregularities probably acted as obstacles to the immigration of Ir during the calcination process, finally resulting in the high dispersity of Ir particles as well as the high catalytic activities. Further studies on the role of TiO2 are still in progress. Fig. 1. N2O activities of TiO2 doped Ir/Al2O3 catalysts Fig. 2. TEM and SEM images Conclusions TiO2 doped Ir/Al2O3 catalysts greatly promoted the catalytic activity of direct N2O decomposition, probably due to the high dispersity of Ir particles induced by the irregular surfaces. References [1] Junhua Li, Yongqing Zhu, Rui Ke, Jiming Hao, Applied Catalysis B: Environmental 80 (2008) 202–213.
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/115919
专题中国科学院大连化学物理研究所
通讯作者Zhang T(张涛)
推荐引用方式
GB/T 7714
Liu S,Cong Y,Huang YQ,et al. TiO2 PROMOTION OF Ir/Al2O3 CATALYST FOR DIRECT N2O DECOMPOSITION[C]. 待补充:待补充,2011:138-0.
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