Mg含量对氢化燃烧合成MgH2水解制氢性能的影响

Effect of Mg Additive on Hydrogen Generation via Hydrolysis of MgH2 Prepared by Hydriding Combustion Synthesis

摘要:

系统研究了Mg的添加量及球磨时间对氢化燃烧合成（Hydriding Combustion Synthesis，HCS）MgH2在MgCl2溶液中水解释氢动力学性能的影响。MgH2-60%Mg（质量分数，下同）经3 h球磨后在5 min内释氢量为993 mL/g（转化率达80%），经15 min可完全水解，副产物为单一的Mg(OH)2。研究表明：镁的添加在降低制氢成本的同时，一方面可提高释氢动力学性能，另一方面也便于副产物回收再生

Abstract:

The effects of Mg addition content and ball milling time on the hydrolysis kinetics of MgH2 prepared by hydriding combustion synthesis (HCS) in MgCl2 solution were investigated. When MgH2-60%Mg was milled for 3 h, hydrogen yield reached to 993 mL/g within 5 min (80% in conversion) and the hydrolysis was completed within 15 min with a single phase of Mg(OH)2 as the byproduct. Results indicate that the HCSed MgH2 with addition of Mg can serve as a low-cost on-board hydrogen source with some advantages such as excellent kinetics of hydrolysis and easy recycle of byproduct.