Purification of Hydrogen Containing Carbon Dioxide Using Metal Hydride

In this work, the influence of carbon dioxide concentration in the hydrogen on metal hydride has been investigated. LmNi4.73Mn0.12Al0.15 was employed as a sample material for its durability against inorganic compound and operating temperature and pressure. Mixture of hydrogen and carbon dioxide is supplied to the sample in a double-ended cylinder at a constant flow rate and a part of the supplied gas is released to avoid condensing of impurity at a smaller constant flow rate than inlet. The temperature is maintained at 30 °C. The experimental results show the sample is able to absorb hydrogen selectively at carbon dioxide concentrations less than 30 vol% and the mixture of the carbon dioxide concentration of 20 vol% is purified to less than 0.1%.