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题名: Ammonia synthesis on graphitic-nanofilament supported Ru catalysts
作者: Li, ZL;  Liang, CH;  Feng, ZC;  Feng, ZC;  Ying, PL;  Wang, DZ;  Li, C
关键词: ammonia synthesis ;  graphitic-nanofilaments ;  Ru ;  promoter ;  kinetics
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2004-03-15
DOI: 10.1016/j.molcata.2003.09.028
卷: 211, 期:1-2, 页:103-109
收录类别: SCI
文章类型: Article
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Graphitic-nanofilaments (GNFs) supported ruthenium catalysts were prepared and characterized by NZ physisorption, X-ray diffraction (XRD), transmission electron microscope (TEM) and temperature programmed reduction-mass spectroscopy (TPR-MS) and used for ammonia synthesis in a fixed bed microreactor. The TEMs of the Ru/GNFs and Ru-Ba/GNFs catalysts indicate that the Ru particles are in the range of 2-4 nm, which is the optimum size of Ru particles for the maximum number of B5 type sites. The activity of Ru-Ba/GNFs catalysts is higher than that of Ru-Ba/AC by about 25%. The methanation reaction on the Ru/GNFs catalyst is remarkably inhibited compared with a Ru/AC catalyst. High graphitization of GNFs is likely to be the reason for the high resistance to the methanation reaction. The power rate law for ammonia synthesis on Ru-Ba/GNFs catalysts can be expressed by r = Kp(NH3)(-0.4) P-N2(0.8) P-H2(-0.7), indicating that H-2 is an inhibitor for N-2 activation on the catalyst. Catalysts with the promoters Ba, K and Cs show large differences in activity for ammonia synthesis. The catalyst promoted with Ba (Ba/Ru = 0.2 molar ratio) was found to be the most active, whereas that with a K promoter was the least active. (C) 2003 Elsevier B.V. All rights reserved.
关键词[WOS]: RUTHENIUM CATALYSTS ;  CARBON NANOTUBES ;  ACTIVE-CARBON ;  NH3 SYNTHESIS ;  BARIUM ;  KINETICS ;  ADSORPTION ;  PROMOTER ;  CESIUM ;  GROWTH
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000188928600015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/83411
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

Recommended Citation:
Li, ZL,Liang, CH,Feng, ZC,et al. Ammonia synthesis on graphitic-nanofilament supported Ru catalysts[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2004,211(1-2):103-109.
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