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Updated: May 26, 2025
Hydrogen Production and Utilization in a Membrane Reactor
Published on: March 10, 2023
Hydrogen Storage and Release via Carbon Dioxide Hydrogenation to Formate Salts under High-Pressure Conditions with Ir
Seo Ono1,2, Ryoichi Kanega3, Hajime Kawanami1,2
1Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan.
Abstract:
To investigate the potential of formic acid (FA) as a hydrogen carrier, we examined hydrogen storage and production through formate salts generated via CO2 reduction under supercritical fluid conditions. Formate salts were synthesized using Cp*Ir homogeneous catalysts to reduce CO2 under supercritical conditions (CO2: 12 MPa; H2: 0.5 MPa; total 12.5 MPa), achieving turnover frequency (TOF) of 10,240 h-1 and a turnover number (TON) of 20,480 within 2 h at 50 °C. The maximum formate concentration reached 0.81 mol/L after 18 h. The resulting formate salt solution (0.81 mol/L) was subsequently converted into FA (0.50 mol/L) with a 96 % yield by exchange of the cation (K + to H +) using an ion exchange resin. FA was then dehydrogenated to regenerate hydrogen, achieving a FA conversion exceeding 98 %. This process yielded an overall hydrogen recovery rate of over 90 %. These findings demonstrate a viable method for hydrogen storage and regeneration using formate salts as an efficient hydrogen carrier for future energy applications.
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