Development of the Non-electric Power Type Hydrogen Collection System with Hydrogen Storage Materials

摘要

The goal of this work is to develop a hydrogen gas collection system by using hydrogen storage materials. In case of hydrogen leakage, the system is intended to work as the safety apparatus that can prevent hydrogen explosion by collecting hydrogen gas without electric power supply. The composite of magnesium powder with 1 mol% niobium oxide (activated-Mg), which can absorb hydrogen at room temperature, is promising material for the system. To accumulate fundamental knowledge regarding hydrogen collection properties of the system, ～10 g of activated-Mg was placed in a closed container (8L) as simulated experiments. The atmosphere inside the container was controlled (gas mixture of hydrogenitrogen/oxygen) and change in concentrations of hydrogen gas in the container was monitored. The activated-Mg absorbed hydrogen gas of low concentration (＜ 4 vol%) indicating that the hydrogen gas collection system using the activated-Mg has capability to maintain hydrogen concentration in a room below lower explosive limit.