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Title: Bridged transition-metal complexes and uses thereof for hydrogen separation, storage and hydrogenation

The present invention constitutes a class of organometallic complexes which reversibly react with hydrogen to form dihydrides and processes by which these compounds can be utilized. The class includes bimetallic complexes in which two cyclopentadienyl rings are bridged together and also separately .pi.-bonded to two transition metal atoms. The transition metals are believed to bond with the hydrogen in forming the dihydride. Transition metals such as Fe, Mn or Co may be employed in the complexes although Cr constitutes the preferred metal. A multiple number of ancilliary ligands such as CO are bonded to the metal atoms in the complexes. Alkyl groups and the like may be substituted on the cyclopentadienyl rings. These organometallic compounds may be used in absorption/desorption systems and in facilitated transport membrane systems for storing and separating out H.sub.2 from mixed gas streams such as the product gas from coal gasification processes.
Inventors:
 [1];  [1]
  1. (Richland, WA)
Issue Date:
OSTI Identifier:
868031
Assignee:
Battelle Memorial Institute (Richland, WA) PNNL
Patent Number(s):
US 5057300
Contract Number:
AC06-76RL01830
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA
Country of Publication:
United States
Language:
English
Subject:
bridged; transition-metal; complexes; hydrogen; separation; storage; hydrogenation; constitutes; organometallic; reversibly; react; form; dihydrides; processes; compounds; utilized; bimetallic; cyclopentadienyl; rings; separately; -bonded; transition; metal; atoms; metals; believed; bond; forming; dihydride; mn; employed; preferred; multiple; ancilliary; ligands; bonded; alkyl; substituted; absorption; desorption; systems; facilitated; transport; membrane; storing; separating; mixed; gas; streams; product; coal; gasification; mixed gas; preferred metal; metal atom; product gas; metal complexes; transition metals; gas stream; transition metal; gas streams; coal gasification; gasification process; coal gas; metal atoms; metal complex; organometallic compound; reversibly react; transport membrane; bimetallic complexes; organometallic compounds; facilitated transport; hydrogen separation; organometallic complexes; gasification processes; transition-metal complexes; form dihydrides; metallic compound; bridged transition-metal; /423/