title: Development of an Iridium-Based Catalyst for High-Pressure Evolution of Hydrogen from Formic Acid.
abstract: A highly efficient and recyclable Ir catalyst bearing a 4,7-dihydroxy-1,10-phenanthroline ligand was developed for the evolution of high-pressure H2gas (>100 MPa), and a large amount of atmospheric pressure H2gas (>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.
authors.affiliation: Research Institute for Chemical Process Technology, Department of Material and Chemistry, National Institute of Advanced Industrial Science and Technology, Sendai, Miyagi, 983-8551, Japan.|Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Iguchi
authors.affiliation: Research Institute of Energy Frontier, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8565, Japan.|Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Himeda
authors.affiliation: Renewable Energy Research Center, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, Koriyama, Fukushima, 963-0298, Japan.|Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Manaka
authors.affiliation: Research Institute for Chemical Process Technology, Department of Material and Chemistry, National Institute of Advanced Industrial Science and Technology, Sendai, Miyagi, 983-8551, Japan. h-kawanami@aist.go.jp.|Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan. h-kawanami@aist.go.jp.
authors.forename: Hajime
authors.identifier: http://orcid.org/0000-0002-2679-2662
authors.initials: H
authors.lastname: Kawanami
mesh_terms: D002384:Catalysis; D005561:Formates / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry*; D011312:Pressure
chemical_list: D005561:Formates; C030544:formic acid; D007495:Iridium; D006859:Hydrogen
keywords: catalysis; formic acid; high pressure; hydrogen; iridium