Formic acid (FA) as an organic liquid hydrogen carrier has been receiving increased attention.[1,2] We reported that Cp*Ir complexes with an N^N-bidentate ligand such as 2,2'-bipyridine serve as catalysts for FA dehydrogenation (eq. 1) in water.[3] HCOOH → H2 + CO2 (eq. 1) For the practical use of hydrogen production from FA, robustness catalysts under aqueous acidic conditions are required.[4-5] In this presentation, we describe highly active and durable iridium catalysts with pyridyl-pyrazole for FA dehydrogenation.[6] We investigated the catalytic durability in 8 M FA aqueous solution under reflux conditions. The catalysts with pyridyl-pyrazole showed a constant TOF of 110,000 h-1 for 5 hrs. Next, the catalyst was evaluated under a continuous feed of FA at 70 oC for 35 days. As a result, the total TON was 10 million, and the evolved gas volume reached 2.5 m3.

Hydrogen production by fromic acid dehydrogenation using iridium catalysts with pyridyl-pyrazole ligands

2019 Spring National Meeting

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