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Dehydrogenation catalysis of mixed metal Borohydride Ammoniates

混合金属硼氢化铵的脱氢催化

基本信息

批准号：
2445743
负责人：
金额：
--
依托单位：
University of Nottingham
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2445743
关键词：
Dehydrogenation catalysis mixed metal Borohydride

项目摘要

The development of new hydrogen storage materials with high volumetric and gravimetric hydrogendensities is essential to implement fuel cell technology for both mobile and stationary applications.Boron hydride materials involving the combination of H and H during dehydrogenation offer goodhydrogen storage and release properties. Of these compounds, the metal borohydride ammoniates(MBAs), and, more recently, mixed metal borohydride ammoniates areamong the premier candidates for hydrogen storage materials, possessing high gravimetric hydrogenstorage capacities at relatively reasonable dehydrogenation temperatures However, the highlyendothermic nature of the thermal decompositions (to effect evolution of H2) still requires high energyinput and can yield undesirable side-products such as boranes or ammonia (the latter resulting froma preference for deammoniation over dehydrogenation). It has been shown that the use of a catalystcan promote dehydrogenation over deammoniation reactions for MBAs. In order to develop MMBAmaterials in hydrogen storage improvements in selectivity, dehydrogenation reaction conditions andunderstanding of the chemical processes involved are of significant importance. We propose toachieve improvements to MMBA dehydrogenation reactions through the development of newcatalytic methodologies to effect the thermolysis and undertake rigorous experiments to understandthe chemical processes. Using mechanistic experiments and kinetic investigations we will proposemechanisms for these reactions, this information will lead to new catalysts for improvements in areassuch as selectivity and temperatures for thermal decomposition.

开发具有高体积和重量氢密度的新型储氢材料对于实现移动的和固定的应用的燃料电池技术是必不可少的。在这些化合物中，金属硼氢化物氨化物（MBAs）以及最近的混合金属硼氢化物氨化物是储氢材料的首要候选者，在相对合理的脱氢温度下具有高重量储氢容量。热分解的高度吸热性质（以实现H2的释放）仍然需要高能量输入，并且可以产生不期望的副产物，例如硼烷或氨（后者是由于相对于脱氢，优选脱氨而产生的）。结果表明，催化剂的使用可以促进MBA的脱氢反应而不是脱氨反应。为了开发MMBA储氢材料，改善其储氢选择性、脱氢反应条件和理解所涉及的化学过程是非常重要的。我们建议通过开发新的催化方法来实现对MMBA脱氢反应的改进，以影响催化剂，并进行严格的实验来了解化学过程。通过机理实验和动力学研究，我们将提出这些反应的机理，这些信息将导致新的催化剂在热分解的选择性和温度等方面的改进。