Disproportionation of A1-modified LaNi/sub 5/ alloys by repeated H/sub 2/ absorption and desorption

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7039212

Abell, G C; Rutherford, W M; Love, C M; Evans, R III; Cantrell, J S

Development of chemical compressors for H/sub 2/ processing based on the use of reversible metal hydrides, was stimulated by the discovery of novel alloy hydrides, especially LaNi/sub 5/-based alloys. These latter alloys are easily activated, have good capacity (H/M approx. = 1), provide a useful range of equilibrium H/sub 2/ plateau, and are resistant to O/sub 2/ and H/sub 2/O poisoning. However, they tend to disproportionate toward more stable (and thus less reversible) hydrides when subjected to repeated H/sub 2/ absorption/desorption cycles. We have developed a closed loop H/sub 2/ cycling apparatus, supervised and monitored by an IBM PC. This paper describes the system and discusses results obtained for LaNi/sub 5/, LaNi/sub 4.7/Al/sub 0.3/, and LaNi/sub 4.5/Al/sub 0.5/. The results include change of H/M capacity with cycling and postmortem x-ray analyses.

• Research Organization: Monsanto Research Corp., Miamisburg, OH (USA). Mound; Miami Univ., Oxford, OH (USA)
• DOE Contract Number: AC04-76DP00053
• OSTI ID: 7039212
• Report Number(s): MLM-3399(OP); CONF-8610177-7; ON: DE87003025
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080201* -- Hydrogen-- Chemisorption Storage
ADSORPTION
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
DESORPTION
ELEMENTS
HYDRIDATION
HYDROGEN
INTERMETALLIC COMPOUNDS
LANTHANUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NONMETALS
RARE EARTH ALLOYS
SORPTION