Abstract
In order to develop suitable hydrogen storage materials for thermochemical hydrogen compressor using metal hydride, it is necessary to evaluate hydrogen storage properties in high pressure range up to 100 MPa. However, several unexpected issues arose for measuring P-C isotherms up to 100 MPa, which was not observed for the relatively lower pressure range. This led to strange shape of P-C isotherms. In order to solve these, in this paper, we considered the effect of the inner volume of the valve, the pressure increment by a valve operation, and the volume expansion of the sample upon hydrogen absorption. Taken into account these factors, reasonable P-C isotherms were successfully obtained.
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