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Title: Hydride compositions

A composition for use in storing hydrogen, and a method for making the composition. The composition comprises a mixture of two or more hydrides, each hydride having a different series of hydrogen sorption isotherms that contribute to the overall isotherms of the mixture. The hydrides are chosen so that the isotherms of the mixture have regions wherein the hydrogen equilibrium pressure increases with increasing hydrogen, preferably linearly. The isotherms of the mixture can be adjusted by selecting hydrides with different isotherms and by varying the amounts of the individual hydrides, or both. Preferably, the mixture is made up of hydrides that have isotherms with substantially flat plateaus and in nearly equimolar amounts. The composition is activated by degassing, exposing to hydrogen and then heating at a temperature below the softening temperature of any of the. constituents so that their chemical and structural integrity is preserved. When the composition is used to store hydrogen, its hydrogen content can be found simply by measuring P.sub.H.sbsb.2 and determining H/M from the isothermic function of the composition.
Inventors:
 [1]
  1. (North Augusta, SC)
Issue Date:
OSTI Identifier:
870128
Assignee:
United States of America as represented by United States (Washington, DC) SRS
Patent Number(s):
US 5460745
Contract Number:
AC09-89SR18035
Research Org:
WESTINGHOUSE SAVANNAH RIVER CO
Country of Publication:
United States
Language:
English
Subject:
hydride; compositions; composition; storing; hydrogen; method; comprises; mixture; hydrides; series; sorption; isotherms; contribute; overall; chosen; regions; equilibrium; pressure; increases; increasing; preferably; linearly; adjusted; selecting; varying; amounts; individual; substantially; flat; plateaus; nearly; equimolar; activated; degassing; exposing; heating; temperature; below; softening; constituents; chemical; structural; integrity; preserved; store; content; found; simply; measuring; sbsb; determining; isothermic; function; hydrogen content; pressure increase; softening temperature; substantially flat; flat plate; composition comprises; temperature below; structural integrity; storing hydrogen; hydride composition; hydrogen sorption; pressure increases; molar amount; equimolar amounts; molar amounts; sorption isotherms; /252/206/423/