An investigation of the removal of hydrogen from gas mixtures using misch-metal-based hydrogen storage metals

In order to recover helium from the purge gas of synthetic ammonia production unit using Sichuan natural gas as the raw material, the present authors developed several multicomponent misch-metal hydrogen storage alloys with widely different plateau pressures. Experiments were carried out on the removal of hydrogen from simulated gas mixtures composed of H 2 -Ar in different proportions. The effect of the change in various technological parameters, involving pressure, temperature and the rate of flow, and the effect of various combinations of alloys with different plateau pressures was investigated. The results showed that, with favourable technological parameters, the concentration of remnant hydrogen could be reduced to less than 0.2%.