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The Metal Hydride Intermediate-Buffer (MIB) method has been proposed as a measure to enable flexible load following operation and immediate start-up of PEFC system with a reformer. In this method, using the property of metal hydride to absorb hydrogen selectively, hydrogen is stored and purified simultaneously from reformed gas with impurities and subsequently supplied to PEFC stack. In this study, using the fluorinated LmNi4.4Mn0.3Al0.3 metal hydride, we have investigated to improve resistivity of the metal hydride against CO. If the resistivity against CO rises to the 1%, preferential oxidation (PROX) process in reformer can be removed. Important consideration in this method is to keep CO concentration of released hydrogen from metal hydride below 10 ppm. To investigate the effect of CO, absorption experiment of hydrogen from simulated reformed gas containing 100, 1000 ppm or 1% CO was carried out with the specimen. In the experiment, the simulated reformed gas was supplied to metal hydride container with a constant flow rate and the onset temperatures of the specimen were set at room temperature, 50◦C, 60◦C and 70◦C. After the hydrogen absorption, release experiment was carried out to measure the CO concentration of released hydrogen. The results of the absorption experiment show that hydrogen absorption performance does not deteriorated under the conditions of 100 and 1000 ppm CO. In the case of 1% CO, hydrogen absorption performance deteriorates significantly under room temperature

Hydrogen Purification Method from Reformed Gas Containing High Concentration of CO by Using Metal Hydride