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题名: Microcalorimetric studies of the iridium catalyst for hydrazine decomposition reaction
作者: Li, L;  Wang, XD;  Zhao, XQ;  Zheng, MY;  Cheng, RH;  Zhou, LX;  Zhang, T
通讯作者: 张涛
关键词: microcalorimetry ;  Ir/Al2O3 catalyst ;  hydrazine ;  ammonia ;  decomposition
刊名: THERMOCHIMICA ACTA
发表日期: 2005-08-15
DOI: 10.1016/j.tca.2004.12.018
卷: 434, 期:1-2, 页:119-124
收录类别: ISTP ;  SCI
文章类型: Article
部门归属: 15
项目归属: 1501
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Microcalorimetric studies of H-2, NH3 and O-2 adsorption, as well as the NH3 decomposition activities evaluation were used to characterize the iridium catalysts for hydrazine decomposition with different supports (Al2O3, SiO,) and iridium contents (1.8, 10.8 and 22.1%). The higher H-2 chemisorption amounts on Ir/Al2O3 catalysts than those on the corresponding Ir/SiO2 counterparts revealed that the strong interaction of iridium and Al2O3 led to higher dispersion of iridium on Ir/Al2O3 catalysts than on Ir/SiO2 catalysts. The larger increase in strong H-2 adsorption sites on highly loaded Ir/Al2O3 than the corresponding Ir/SiO2 ones could be attributed to the interaction not only between iridium atoms but also between iridium and Al2O3. The microcalorimetric results for NH3 adsorption showed that no apparent chemisorption of NH3 existed on Ir/SiO2 catalysts while NH3 chemisorption amounts increased on Ir/Al2O3 catalysts with iridium loadings, which arose from the interaction of the catalysts support of Al2O3 With chloride anion. Both highly dispersed iridium active sites and chloride anion on Ir/Al2O3 catalysts could be beneficial to the intermediate NH3 decomposition in N2H4 decomposition. The similar O-2 plots of differential heat versus normalized coverage on Ir/Al2O3 and Ir/SiO2 catalysts could not be due to the metal-support interaction, but to the formation of strong Ir-O bond. (C) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: SUPPORTED IRIDIUM ;  ADSORPTION ;  ENERGETICS ;  ALUMINA ;  SURFACE ;  METALS
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000231209500020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/92423
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.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Li, L,Wang, XD,Zhao, XQ,et al. Microcalorimetric studies of the iridium catalyst for hydrazine decomposition reaction[J]. THERMOCHIMICA ACTA,2005,434(1-2):119-124.
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