Solid-State Hydrogen Storage Materials of Application to Energy Needs
Semi-annual technical rept. no. 2, 1 Jan-30 Jun 1975
DENVER RESEARCH INST CO METALLURGY AND MATERIALS SCIENCE DIV
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During this period, four general areas of effort were pursued 1 Design and construction were completed on a high pressure hydriding apparatus, which will reach about 2000 bars in comparison with the 136 bars available in the present Sievert apparatus. Construction has had to include the pressure- measuring device for the upper two-thirds of the scale, not available commercially in non-hydrogen-embrittleable metal. 2 The major effort on rates of desorption of hydrogen from LaNi5 was completed, after a number of reactor designs were employed in order to find the optimum conditions and purities. The first-cycle rate of descorption yields a second-order rate constant of 0.077 per second per unit ratio of H atoms to LaNi5. Over the temperature range 15 to 25 degrees C., the activation energy is 21.9 kcalmole. 3 Poisoning of LaNi5 by air, oxygen and water was studied up to 100 degrees C with the conclusion that effects on hydriding are only temporary and limited to rate effects. 4 preliminary hydrogen absorption-desorption measurements were made with 10 alloys and intermetallic compounds. These were selected compositions in the V-Cr and Nb-Mo systems, aluminum-saturated alpha-titanium, and the compounds CoTi, CeAl, CeAl2, CeAl4, and CeFe5. A few of the results encourage further study.
- Physical Chemistry