原位还原第四周期过渡金属盐催化氨硼烷水解产氢研究

该文探究了原位还原第四周期过渡金属盐(FeCl2、CoCl2、NiCl2、CuCl2和ZnCl2)催化氨硼烷水解产氢性能,发现它们催化氨硼烷水解产氢活性由高至低依次为CuCl2>CoCl2>NiCl2>FeCl2>ZnCl2,这些盐催化氨硼烷水解产氢速率与它们及其相应金属组成电对的标准还原电极电势呈近似线性关系,这说明...

The Hydrogen Production from Catalytic Hydrolysis of BH3NH3 over the Fourth Period Transition Metals of In-Situ Reduction

The fourth period transition metal catalysts are synthesized by in-situ reduction of FeCl₂,CoCl₂,NiCl₂,CuCl₂ and ZnCl₂.And the prepared catalysts are evaluated for hydrolysis of BH₃NH₃ towards hydrogen production.It is found that the catalytic activity over the tested transition metal catalysts is ranked as CuCl₂>CoCl₂>NiCl₂>FeCl₂>ZnCl₂,which depends linearly on their corresponding standard electric potential and indicates that higher standard electric potential leads to the easier reduction of the corresponding metal salt.This further improves the catalytic activity of hydrolysis of BH₃NH₃ towards hydrogen production.When 0.001 0 mol CoCl₂,0.000 5 mol NiCl₂ and 0.002 0 mol CuCl₂ are in-situ reduced and applied for the catalytic experiments,the optimum stirring rate is 210,480 and 210 rpm,respectively.And the T_OF obtained over Co,Ni and Cu catalysts is 104.9 mol H₂·mol^-1Co·min^-1,21.6 mol H₂·mol^-1Ni·min^-1 and 217.2 mol H₂·mol^-1Cu·min^-1,respectively.According to the kinetic calculation,the E_a over the in-situ reduced CoCl₂,NiCl₂ and CuCl₂ is 35,65 and 6 kJ·mol^-1,respectively.Furthermore,magnetic properties are detected over the in-situ reduced CoCl₂ catalyst,which is easily separated from reaction environments.And no obvious aggregation is observed.More importantly,the reusability of Co catalyst is clearly superior to that observed over in-situ reduced CuCl₂ catalyst.