Screening New families of Metal Organic Frameworks for Hydrogen Storage

筛选新的储氢金属有机框架家族

• 批准号: EP/F062443/1
• 负责人: Carl Redshaw
• 金额: $ 22.68万
• 依托单位: University of East Anglia
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF062443%2F1
• 关键词: Screening; New; families; Metal; Organic

Mankind has now realised that its dependance on oil cannot last forever. Viable alternative fuels are frantically being sought, particularly for use in the automobile industry. Hydrogen is emerging as a promising candidate, as it can be generated from a variety of sources. As a clean burning substitute, hydrogen has the potential to dramatically cut our carbon dioxide emissions to the levels suggested in the 2007 White paper (60 % reduction by 2050), however to be practical any new fuel needs to be safe and compact. As hydrogen is a gas at ambient temperatures, it would need to be compressed under very high pressures or cooled to very low temperatures to provide sufficient supplies necessary for the running of vehicles. Neither high pressures nor low temperatures are acceptible, not least on safety grounds. In an attempt to circumvent these problems, methods of chemical storage are been investigated. Amongst the front runners currently under investigation are microporous materials, which relie on high surface area and strong hydrogen binding affinity. Large scale syntheses and chemical flexibility are other important considerations, which put coordination networks based on metal ions linked by organic spacer molecules in the shop window. These metal-organic frameworks (MOFs) have recently shown potential for hydrogen uptake with systems based on zinc clusters/carboxylate linkers exhibiting hydrogen absorption values, albeit at low temperatures, approaching the 2010 targets set by the US Department of Energy for on-board hydrogen storage.It is the intention here to evaluate a promising new familiy of MOFs, the structures of which are based on zinc (or aluminium) clusters linked by diphenolate spacers. These systems possess all the attributes necessary for hydrogen absorption, can be prepared on multi-gramme scale and are readily amenable to chemical modification, including the incorporation of alkali-metal ions shown in other systems to be beneficial to hydrogen uptake. The zinc (and aluminium) clusters in our systems also possess intruiging and potentially useful conformations, which create internal pockets that are well suited to small molecule capture.

人类现在已经意识到对石油的依赖不可能永远持续下去。人们正在疯狂地寻找可行的替代燃料，特别是用于汽车工业。氢气正成为一个有希望的候选者，因为它可以从多种来源产生。作为一种清洁燃烧的替代品，氢有可能将我们的二氧化碳排放量大幅减少到2007年白皮书中建议的水平（到2050年减少60%），然而，任何新燃料都需要安全和紧凑。由于氢气在环境温度下是气体，因此需要在非常高的压力下压缩或冷却到非常低的温度，以提供车辆运行所需的足够供应。无论是高压还是低温都是不可接受的，尤其是出于安全考虑。为了避免这些问题，研究了化学储存的方法。目前正在研究的前沿材料是微孔材料，它依赖于高表面积和强氢结合亲和力。大规模合成和化学柔韧性是其他重要的考虑因素，这使得基于有机间隔分子连接的金属离子的配位网络出现在商店橱窗里。这些金属有机框架（mof）最近显示出基于锌簇/羧酸盐连接剂的系统的吸氢潜力，尽管在低温下，也显示出吸氢值，接近美国能源部设定的2010年车载储氢目标。本文的目的是评价一个有前途的新型mof家族，其结构基于锌（或铝）团簇，由二酚酯间隔物连接。这些系统具有氢吸收所必需的所有属性，可以以多克规模制备，并且易于进行化学改性，包括在其他系统中显示的有利于氢吸收的碱金属离子的加入。我们系统中的锌（和铝）团簇也具有有趣和潜在有用的构象，这些构象产生了非常适合小分子捕获的内部口袋。