Premium
Development of an Iridium‐Based Catalyst for High‐Pressure Evolution of Hydrogen from Formic Acid
Author(s) -
Iguchi Masayuki,
Himeda Yuichiro,
Manaka Yuichi,
Kawanami Hajime
Publication year - 2016
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.201600697
Subject(s) - formic acid , dehydrogenation , catalysis , chemistry , iridium , aqueous solution , hydrogen , solubility , inorganic chemistry , filtration (mathematics) , nuclear chemistry , organic chemistry , statistics , mathematics
A highly efficient and recyclable Ir catalyst bearing a 4,7‐dihydroxy‐1,10‐phenanthroline ligand was developed for the evolution of high‐pressure H 2 gas (>100 MPa), and a large amount of atmospheric pressure H 2 gas (>120 L), over a long term (3.5 months). The reaction proceeds through the dehydrogenation of highly concentrated aqueous formic acid (FA, 40 vol %, 10 mol L −1 ) at 80 °C using 1 μmol of catalyst, and a turnover number (TON) of 5 000 000 was calculated. The Ir catalyst precipitated after the reaction owing to its pH‐dependent solubility in water, and 94 mol % was recovered by filtration. Thus, it can be treated and recycled like a heterogeneous catalyst. The catalyst was successfully recycled over 10 times for highpressure FA dehydrogenation at 22 MPa without any treatment or purification.