Hydrogen isotope absorption amount and rate of Pd-Al2O3 pellets

A special type of Pd-Al2O3 pellet, which included Pd in high weight percent as a hydrogen isotope separation material was prepared by a compression mo lding method. The pressure-composition isotherm and the plateau pressure of the Pd-Al2O3 hydrogen isotope system were determined by a volumetric metho d. The pellet has high hydrogen absorption ability even at 196 K, and the r eaction rate is controlled by surface reaction. The hydrogen absorption cap acity and the rate of the Pd-hydrogen system were unchanged by the addition of Al2O3 It was found that the Pd-Al2O3 pellet has high durability against repeated absorption-desorption cycles. There is no change in the absorptio n amount and the rate up to 1000 times of absorption-desorption cycles. (C) 2001 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.