DICP OpenIR
Subject Area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)
Source PublicationPreceedings of CarboCat IV
Conference Name4th International Symposium on Carbon for Catalysis
Conference Date2010-11-7
2011
Conference Place大连
Pages75-0
Publisher待补充
Publication Place待补充
Cooperation Status特邀报告
Department502
Funding Organization大连化物所
AbstractCarbon 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.
Language英语
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/115899
Collection中国科学院大连化学物理研究所
Corresponding AuthorPan XL(潘秀莲); Bao XH(包信和)
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[张洪波]'s Articles
[潘秀莲]'s Articles
[刘景月]'s Articles
Baidu academic
Similar articles in Baidu academic
[张洪波]'s Articles
[潘秀莲]'s Articles
[刘景月]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[张洪波]'s Articles
[潘秀莲]'s Articles
[刘景月]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.