高效能Li-Mg-N-H 化學儲氫材料之改質與動力學研究;The Promotion and Hydrogenation/Dehydrogenation Kinetics of Modified Li-Mg-N-H Chemical Hydrides

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题名:	高效能Li-Mg-N-H 化學儲氫材料之改質與動力學研究;The Promotion and Hydrogenation/Dehydrogenation Kinetics of Modified Li-Mg-N-H Chemical Hydrides
作者:	王冠文
贡献者:	中央大學材料科學與工程研究所
关键词:	能源工程;材料科技
日期:	2009-09-01
上传时间:	2012-10-01 11:22:33 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	氫氣，為未來最具希望的乾淨燃料。氫能源應用的技術瓶頸之一為氫氣的儲存，本研究擬在高儲量的Li-Mg-N-H 化學儲氫系統上進行一系列改質，系統性的研究儲氫材料的儲氫/脫氫反應，期能研發出新穎儲氫材料，滿足美國能源部 (US DOE)發表的儲氫應用規劃，亦即儲氫材料滿足6.5 wt%以及65 g/L 的重量與體積密度，且分解溫度介於60 ~ 120 oC 的需求。本研究擬在三年內用不同的化學儲氫系統以及觸媒進行改質。第一年，將使用Pd-Co 和Pd-Ag 合金觸媒改質Li3N, Li3N+LiNH2, Li2NH,及LiBH4。在這一年，我們將研究觸媒的合金組成與表面結構對於化學儲氫材料之動力學影響。第二年，我們擬在相同的儲氫材料上(Li3N, Li3N+LiNH2, Li2NH,及LiBH4)，以他種儲氫材料改質，如Pd，LaNi5，Mg2Ni，奈米碳管，及金屬有機骨架材料(MOF)等，嘗試藉著不同儲氫材料特性的優勢，達成互相加成的效果，製備具有卓越吸放氫動力學的儲氫材料，每一種添加材料皆系統化的探討其形貌，結構對其催化效應的影響，在第二年，我們也期待能架設一套程式升溫還原系統(TPR)。第三年，我們研究 Mg(NH2)2 /LiH 及LiNH2/MgH2 儲氫材料系統，並以上述合金觸媒與他種儲氫材料改質，將前兩年的經驗應用在新的儲氫系統上，並繼續探討合金觸媒的組成，以及他種儲氫材料對於系統的加成效應，在第三年，我們希望能夠將GC-TPR 系統組裝完成，更充分且完備的了解所釋放氫氣的純度與反應副產物。本計畫擬用以上方法得到最佳化儲氫材料，朝向高儲氫量，高體積密度，易活化，吸放氫反應溫度與壓力適中，低放熱，可逆性佳，長程吸放氫氣穩定性佳，安全性，低成本，使用壽命長等優點，並用XRD，TEM，SEM，ESCA，ICP，TPH/TPD-GC，PCI 分析。 ; Hydrogen is viewed as a promising clean fuel of the future. The studies of hydrogen production, hydrogen purification, hydrogen application, fuel cell and hydrogen storage have attracted much attention and been studied widely in academic and technologic fields. Hydrogen storage technology is critical for the development of a hydrogen-based energy. In this project, the modification of Li-Mg-N-H materials and their application in the hydrogen storage materials will be studied. The effects of the modifications, preparation methods, pretreatments of the materials on the hydrogen capacity and adsorption/desorption properties will be investigated systematically. The aim of this study is to develop novel hydrogen storage materials to meet the US DOE goals, which requires a storage capacity of 6.5 wt % and 65 g/L at the decomposition temperature between 60 and 120 oC for commercial viability. During this three-year project, several kinds of chemical hydrides will be modified and promoted by various catalysts. During the first year, Pd-Co and Pd-Ag alloy catalysts will be used to modify the Li3N, Li3N+LiNH2, Li2NH, and LiBH4 materials. The relationship between surface compositions and structures of the alloy catalysts and the hydrogenation/dehydrogenation kinetics of chemical hydrides will also be investigated. During the second year, other kinds of hydrogen storage materials, such as Pd, LaNi5, Mg2Ni, carbon nanotube (CNT), and metal-organic framework (MOF) will be used as promoters to modify the Li3N, Li3N+LiNH2, Li2NH,and LiBH4 materials. The synergistic effect between those hydrogen storage materials may be observed and a hydrogen storage system with excellent hydrogenation/dehydrogenation kinetics may be prepared. A temperature programmed reduction (TPR) apparatus will be also set up in this year. During the third year, the experiences from the first two years will be followed up. The new Mg(NH2)2 /LiH and LiNH2/MgH2 systems will be modified by alloy catalysts and other kinds of hydrogen storage materials. The surface effect of the alloy catalysts and the synergistic effect of the hydrogen storage materials will be examined. The setup of the GC-TPR system is also the target of the third year in order to check the purification of the releasing H2 and the amount of the by-products. By use of the above methods, novel hydrogen storage materials with high hydrogen capacity, fast activation process and kinetics, low temperature of hydrogen desorption, low pressure of hydrogen absorption, good reversibility, durability, stability, safety, and low cost will be developed. The hydrogenation/dehydrogenation performance and basic properties of the hydrogen storage materials will be characterized by TEM, SEM, ESCA, ICP, GC-TPH/TPD, and PCI. ; 研究期間 9808 ~ 9907
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
显示于类别:	[材料科學與工程研究所 ] 研究計畫

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