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题名: Solid-Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH2)(2)/2 LiH Composite
作者: Wang, Jianhui1, 2;  Chen, Ping1;  Pan, Hongge2;  Xiong, Zhitao1;  Gao, Mingxia2;  Wu, Guotao1;  Liang, Chu2;  Li, Cao2;  Li, Bo2;  Wang, Jieru2
关键词: dehydrogenation ;  heterogeneous catalysis ;  hydrides ;  magnesium ;  potassium
刊名: CHEMSUSCHEM
发表日期: 2013-11-01
DOI: 10.1002/cssc.201200885
卷: 6, 期:11, 页:2181-2189
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: Considerable efforts have been devoted to the catalytic modification of hydrogen storage materials. The K-modified Mg(NH2)(2)/2LiH composite is a typical model for such studies. In this work, we analyze the origin of the kinetic barrier in the first step of the dehydrogenation and investigate how K catalyzes this heterogeneous solid-state reaction. Our results indicate that the interface reaction of Mg(NH2)(2) and LiH is the main source of the kinetic barrier at the early stage of the dehydrogenation for the intensively ball-milled Mg(NH2)(2)/2LiH sample. K can effectively activate Mg(NH2)(2) as well as promote LiH to participate in the dehydrogenation. Three K species of KH, K2Mg(NH2)(4), and Li3K(NH2)(4) likely transform circularly in the dehydrogenation (KHK2Mg(NH2)(4)KLi3(NH2)(4)), which creates a more energy-favorable pathway and thus leads to the overall kinetic enhancement. This catalytic role of K in the amide/hydride system is different from the conventional catalysis of transition metals in the alanate system.
关键词[WOS]: N-H SYSTEM ;  HYDROGEN STORAGE PROPERTIES ;  HYDRIDE ;  DESORPTION ;  MECHANISM ;  COMPLEX ;  AMIDE ;  KINETICS ;  SORPTION ;  LIBH4
语种: 英语
WOS记录号: WOS:000326840000029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137907
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.Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China

Recommended Citation:
Wang, Jianhui,Chen, Ping,Pan, Hongge,et al. Solid-Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH2)(2)/2 LiH Composite[J]. CHEMSUSCHEM,2013,6(11):2181-2189.
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