Studies On The Hydrolysis Of Ammonia Borane And The Reactions Of Metal Borane （KB₃H₈） With MCl₂（M=Ni,Co）

Ammonia borane and metal boranes have attracted extensive attention as hydrogen storage materials.Catalytic dehydrogenation of ammonia borane and metal boranes has been increasing in recent years.The study includes two parts.（1）Ammonia borane is stable at room temperature and has high hydrogen content and good solubility in water.It is a promising potential hydrogen storage material.In this dissertation,By using a hard carbon sphere as a template and copper nitrate trihydrate as a precursor,turning the concentration of Cu²⁺in the solution and the ratio of ethanol to water in the solvent,a copper oxide hollow sphere material with different shell thickness and pore size was synthesized.Kinetic studies showed that the maximum rate of hydrogen release from the ammonia borane hydrolysis reaction using this catalyst reached 294 mL H₂min^-1（g catalyst）^-1.The catalyst material is inexpensive and easily available and the preparation process is simple and contrallable.All these advantages indicated that the copper oxide hollow sphere is an altenative choice for the catalytic dehydrogenation of ammonia borane.（2）The potassium borane KB₃H₈ is not only widely used as a hydrogen storage material,but also as a reducing agent in various organic and inorganic reactions.In this paper,the reactions between KB₃H₈ and transition metal chloride（NiCl₂ and Co Cl₂）were studied.In THF or aqueous solution,the redox reaction occurred and the transition metal ions were reduced to metal;However,in the presence of certain nitrogen-containing ligand（ethylenediamine）,the redox reaction would not be happened instead of a methathesis reaction took place to produce a new amine transition metal borohydride compound,which can probable be a new hydrogen storage material ora precursor for the synthesis of new transition metal borides.