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Amine‐Free Reversible Hydrogen Storage in Formate Salts Catalyzed by Ruthenium Pincer Complex without pH Control or Solvent Change
Author(s) -
Kothandaraman Jotheeswari,
Czaun Miklos,
Goeppert Alain,
Haiges Ralf,
Jones JohnPaul,
May Robert B.,
Prakash G. K. Surya,
Olah George A.
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201403458
Subject(s) - formate , dehydrogenation , hydrogen storage , catalysis , chemistry , ruthenium , inorganic chemistry , pincer movement , hydrogen , amine gas treating , solvent , photochemistry , organic chemistry
Due to the intermittent nature of most renewable energy sources, such as solar and wind, energy storage is increasingly required. Since electricity is difficult to store, hydrogen obtained by electrochemical water splitting has been proposed as an energy carrier. However, the handling and transportation of hydrogen in large quantities is in itself a challenge. We therefore present here a method for hydrogen storage based on a CO 2 (HCO 3 − )/H 2 and formate equilibrium. This amine‐free and efficient reversible system (>90 % yield in both directions) is catalyzed by well‐defined and commercially available Ru pincer complexes. The formate dehydrogenation was triggered by simple pressure swing without requiring external pH control or the change of either the solvent or the catalyst. Up to six hydrogenation–dehydrogenation cycles were performed and the catalyst performance remained steady with high selectivity (CO free H 2 /CO 2 mixture was produced).