A hydrogen storage material based on sodium alanate contains aluminum in excess of the stoichiometric aluminum content of sodium aluminum tetrahydride. A particulate mixture of sodium alanates, aluminum, and a suitable metal-containing catalyst readily yields, upon heating of the mixture, its hydrogen content for delivery to a hydrogen-using device. The excess aluminum facilitates the sorption of hydrogen, minimizes the amount of necessary catalyst, and improves packing of the particulate mixture and heat transfer to and from the mixture.
 This invention was made in the course of work under a Funds-In Agreement No. FI 087030804 between the United States Department of Energy, General Motors Corporation, and Sandia National Laboratories.