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Kinetic Studies on Formic Acid Dehydrogenation Catalyzed by an Iridium Complex towards Insights into the Catalytic Mechanism of High‐Pressure Hydrogen Gas Production
Author(s) -
Iguchi Masayuki,
Zhong Heng,
Himeda Yuichiro,
Kawanami Hajime
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702969
Subject(s) - dehydrogenation , formic acid , catalysis , iridium , chemistry , water gas shift reaction , hydrogen , reaction mechanism , kinetic isotope effect , kinetic energy , ligand (biochemistry) , hydrogen production , photochemistry , rate determining step , inorganic chemistry , organic chemistry , deuterium , biochemistry , physics , receptor , quantum mechanics
Kinetic studies on the catalytic reaction mechanism of formic acid (FA) dehydrogenation were performed in the presence of a water‐soluble iridium complex bearing a 4,4′‐dihydroxy‐2,2′‐bipyridine ligand. Determination of kinetic isotope effects revealed that a shift of the rate‐limiting step at low and high concentrations of FA can be caused by the pH dependence of the reaction steps. The proposed equation for the reaction rate corresponds well with the experimental results concerning the shift phenomena. Towards industrial application in future hydrogen fueling stations, this will able the design of a dehydrogenation system catalyzed by the iridium complex.