Iguchi Masayuki, Zhong Heng, Himeda Yuichiro, Kawanami Hajime
Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology, 4-2-1 Niagatake, Miyagino-ku, Sendai, 983-8551, Japan.
Research Institute of Energy Frontier, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
Chemistry. 2017 Dec 1;23(67):17017-17021. doi: 10.1002/chem.201702969. Epub 2017 Sep 13.
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.
