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题名: Mesoporous silica supported cobalt catalysts for hydrogen generation in hydrolysis of ammonia borane
作者: Luo, Yi-Chia1;  Liu, Yi-Hsin1;  Hung, Yann1;  Liu, Xiao-Yan2;  Mou, Chung-Yuan1
关键词: Ammonia-borane ;  Hydrolysis ;  Hydrogen generation ;  X-ray absorption spectroscopy ;  Supported Co-B catalyst ;  MCM-41 acidity
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2013-06-18
DOI: 10.1016/j.ijhydene.2013.03.153
卷: 38, 期:18, 页:7280-7290
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: Mesoporous silica supported cobalt boride (Co-B) catalysts are rationally designed for hydrogen generation in ammonia-borane hydrolysis reactions under ambient conditions. Cobalt boride catalysts are supported on three different mesoporous silica, including beta-zeolite seeded MCM-41 (Co@M41S) and traditional MCM-41 (Co@M41T) via chemical adsorption onto functionalized surface with 3-trihydroxysilylpropylmethylphosphonate (THPMP), and one-step co-precipitation into mesoporous silica framework (Co@M41C). Our preparation strategies provide two insights to the reactions: first, cobalt oxide species are intrinsically deposited as ultra-small nanoparticles (<2 nm) on mesoporous silica supports; subsequently the nanoparticles are converted to active Co-B catalysts by reduction with sodium borohydride (SB). Three catalysts exhibit significant differences in catalytic reactivities with hydrogen production rates ranked in an order of Co@M41S > Co@M41T > Co@M41C. Detailed analysis of the coordination environments from in situ X-ray absorption spectroscopy (XAS) results confirm reducibility in SB. Amorphous nature of Co-B catalysts are responsible for efficient catalytic activity in Co@M41S and Co@M41T. Ammonia temperature programmed desorption (NH3-TPD) demonstrates support acidity that correlates to the degree of high dispersity and effective reducibility to Co-B. Effects from catalyst sizes, reducibility in SB treatment and surface acidity are studied in detail to compare catalytic reactivities among three types of supports. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: B ALLOY CATALYSTS ;  ROOM-TEMPERATURE ;  SODIUM-BOROHYDRIDE ;  NABH4 HYDROLYSIS ;  BORIDE CATALYSTS ;  FUEL-CELLS ;  CO ;  EFFICIENT ;  METAL ;  DEHYDROGENATION
语种: 英语
WOS记录号: WOS:000321165400012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137723
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.Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian, Peoples R China

Recommended Citation:
Luo, Yi-Chia,Liu, Yi-Hsin,Hung, Yann,et al. Mesoporous silica supported cobalt catalysts for hydrogen generation in hydrolysis of ammonia borane[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2013,38(18):7280-7290.
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