High-pressure Hydrogen Production by Formic Acid Dehydrogenation

This review reports recent progress in the use of formic acid (FA) as a hydrogen (H2) 2 ) carrier with the author's results. It shows both homogeneous and heterogeneous catalysts for the dehydrogenation of FA (FADH) with some selected catalysts designed for high-pressure gas production. Although FA can be readily generating H2 2 gas, thereby serving as an effective H2 2 carrier, the generated gas mixture includes H2 2 with 50 % CO2. 2 . This composition has presented challenges for applications such as in H2 2 fuel cells. However, certain catalysts, such as iridium complexes, can easily produce gases at the pressures over 100 MPa from FA, enabling the gas-liquid separation under high pressure conditions. This advantage has simplified the separation process for H2 2 and CO2. 2 . With these developments, the using formic acid as a H2 2 carrier has greatly increased with expectations for the future systems of H2 2 refueling stations. Additionally, the prospect of using separated liquid CO2 2 in various domains will be achieved sustainable chemical processing and energy solutions.