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题名: Probing the Electronic Effect of Carbon Nanotubes in Catalysis: NH3 Synthesis with Ru Nanoparticles
作者: Guo, Shujing1;  Pan, Xiulian1;  Gao, Haili2, 3;  Yang, Zhiqiang1;  Zhao, Jijun2, 3;  Bao, Xinhe1
关键词: ammonia ;  calorimetry ;  carbon nanotubes ;  confinement ;  ruthenium
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2010
DOI: 10.1002/chem.200902371
卷: 16, 期:18, 页:5379-5384
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Carbon nanotubes (CNTs) have been shown to modify some properties of nanomaterials and to modify chemical reactions confined inside their channels, which are formed by curved graphene layers. Here we studied ammonia synthesis over Ru as a probe reaction to understand the effect of the electron structure of CNTs on the confined metal particles and their catalytic activity. The catalyst with Ru nanoparticles dispersed almost exclusively on the exterior nanotube surface exhibits a higher activity than the CNT-confined Ru, although both have a similar metal particle size. Characterization with TEM, N-2 physisorption, H-2 chemisorption, temperature-programmed reduction. CO adsorption microcalorimetry, and first-principles calculations suggests that the outside Ru exhibits a higher electron density than the inside Ru. As a result, the dissociative adsorption of N-2 which is an electrophilic process and the rate-determining step of ammonia synthesis. is more facile over the outside Ru than that over the inside one.
关键词[WOS]: AMMONIA-SYNTHESIS ;  RUTHENIUM CATALYST ;  SURFACES ;  MOLECULES ;  CHEMISTRY ;  METAL ;  IRON ;  CO ;  HYDROGENATION ;  CONFINEMENT
语种: 英语
WOS记录号: WOS:000277988900018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142189
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Dalian Univ Technol, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China
3.Dalian Univ Technol, Coll Adv Sci & Technol, Dalian 116024, Peoples R China

Recommended Citation:
Guo, Shujing,Pan, Xiulian,Gao, Haili,et al. Probing the Electronic Effect of Carbon Nanotubes in Catalysis: NH3 Synthesis with Ru Nanoparticles[J]. CHEMISTRY-A EUROPEAN JOURNAL,2010,16(18):5379-5384.
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