Accession Number:

ADA019528

Title:

Solid-State Hydrogen Storage Materials of Application to Energy Needs

Descriptive Note:

Semi-annual technical rept. no. 2, 1 Jan-30 Jun 1975

Corporate Author:

DENVER RESEARCH INST CO METALLURGY AND MATERIALS SCIENCE DIV

Personal Author(s):

Report Date:

1975-07-01

Pagination or Media Count:

31.0

Abstract:

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.

Subject Categories:

  • Physical Chemistry
  • Fuels

Distribution Statement:

APPROVED FOR PUBLIC RELEASE