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学科主题物理化学
Enhanced catalytic activity of subnanometer titania clusters confined inside double-wall carbon nanotubes
Zhang HB(张洪波); Pan XL(潘秀莲); Liu JY(刘景月); WeizhongQian; FeiWei; YuyingHuang; Bao XH(包信和)
会议文集Preceedings of CarboCat IV
会议名称4th International Symposium on Carbon for Catalysis
会议日期2010-11-7
2011
会议地点大连
页码75-0
出版者待补充
出版地待补充
合作性质特邀报告
部门归属502
主办者大连化物所
英文摘要Carbon nanotubes (CNTs) are formed by sp2 hybridized carbon and their diameters range from less than 1 nm to several dozen nanometers. Various types of metal or metal oxide particles have been introduced into CNTs as catalysts. 1, 2 It has been found that depending on the relative location of the nanoparticles (inside vs. outside of the CNTs) they exhibit different activities. These catalytic reactions include gas phase reactions such as syngas conversion, ammonia synthesis and ammonia decomposition, and liquid phase reactions such as hydrogenation and hydroformylation. Up to now, most experimental studies on the reaction over the CNT-confined catalysts were limited to multi-walled CNTs (MWNTs).1, 2 In this work, we introduced subnanometer titania clusters homogeneously within double-wall carbon nantubes (DWNTs) with an inner diameter ranging from 1.0 to 1.5 nm. The confined titania exhibits an activity 8 times higher than the titania particles attached on the outside walls of the DWNTs (the outside titania) in epoxidation of propylene by H2O2. XPS, XANES and Raman spectroscopy data suggest electron transfer from titanium to the inner surfaces of the DWNTs. In contrast, no electron transfer has been observed for the outside titania. We also found that the extent of this confinement-induced electron transfer is temperature dependent. The enhanced activity of the confined titania clusters is likely attributed to their small sizes and the interaction with the DWNT surface. The synthesis method that we developed here can be readily applied to incorporation of other metal/metal oxide nanoparticles into carbon nanotubes.; Carbon nanotubes (CNTs) are formed by sp2 hybridized carbon and their diameters range from less than 1 nm to several dozen nanometers. Various types of metal or metal oxide particles have been introduced into CNTs as catalysts. 1, 2 It has been found that depending on the relative location of the nanoparticles (inside vs. outside of the CNTs) they exhibit different activities. These catalytic reactions include gas phase reactions such as syngas conversion, ammonia synthesis and ammonia decomposition, and liquid phase reactions such as hydrogenation and hydroformylation. Up to now, most experimental studies on the reaction over the CNT-confined catalysts were limited to multi-walled CNTs (MWNTs).1, 2 In this work, we introduced subnanometer titania clusters homogeneously within double-wall carbon nantubes (DWNTs) with an inner diameter ranging from 1.0 to 1.5 nm. The confined titania exhibits an activity 8 times higher than the titania particles attached on the outside walls of the DWNTs (the outside titania) in epoxidation of propylene by H2O2. XPS, XANES and Raman spectroscopy data suggest electron transfer from titanium to the inner surfaces of the DWNTs. In contrast, no electron transfer has been observed for the outside titania. We also found that the extent of this confinement-induced electron transfer is temperature dependent. The enhanced activity of the confined titania clusters is likely attributed to their small sizes and the interaction with the DWNT surface. The synthesis method that we developed here can be readily applied to incorporation of other metal/metal oxide nanoparticles into carbon nanotubes.
语种英语
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/115899
专题中国科学院大连化学物理研究所
通讯作者Pan XL(潘秀莲); Bao XH(包信和)
推荐引用方式
GB/T 7714
Zhang HB,Pan XL,Liu JY,et al. Enhanced catalytic activity of subnanometer titania clusters confined inside double-wall carbon nanotubes[C]. 待补充:待补充,2011:75-0.
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