Abstract
For the purpose of following electricity demand change and improving the efficiency of generation for fuel cells, a new system, which is called metal hydride intermediate buffer method, is developing. The system uses the selective reacting function of hydrogen on metal hydride materials. It is said that metal hydride could be easy to be poisoned by impurities except for hydrogen. Therefore a surface treatment has been adopted with the material to avoid it. We have found that the treatment is effective against H2O and CO2, which exist mainly in the reformed gas. One of general concerns about poisoning by CO included slightly in the reformed gas must be confirmed. In order to verify the treatment effect against CO, hydrogen absorption and desorption experiment were repeated with the simulated reformed gas (SRG) including 100ppm or 1% of CO concentration. In the result, it has been clarified that the metal hydride keeps the absorption property in spite of CO existence. In the CO 100ppm condition, functional deterioration due to CO-poisoning is not recognized at all. The hydrogen absorption rate is significantly reduced in the CO 1% experiment compared with the fuel gas without CO, but the absorption property has not been lost entirely. On the other hand, it has been found that the absorption property is gradually degraded, even if pure hydrogen without any impurities is used.
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