Abstract
Recently, there has been a strong demand for technologies that use hydrogen as an energy carrier, instead of fossil fuels. Hence, new and effective hydrogen storage technologies are attracting increasing attention. Formic acid (FA) is considered an effective liquid chemical for hydrogen storage because it is easier to handle than solid or gaseous materials. This review presents recent advances in research into the development of homogeneous catalysts, primarily focusing on hydrogen generation by FA dehydrogenation. Notably, this review will aid in the development of useful catalysts, thereby accelerating the transition to a hydrogen-based society.
Highlights
Technological development aimed at building a society that uses hydrogen, which can be used with low environmental load and high efficiency, as an energy medium is urgently required
Researchers have focused on a hydrogen storage system using formic acid (FA) as a hydrogen carrier
The free energy required for mutual conversion with carbon dioxide in an aqueous solution is −4 kJ/mol, significantly smaller than that of other hydrogen carriers
Summary
Technological development aimed at building a society that uses hydrogen, which can be used with low environmental load and high efficiency, as an energy medium is urgently required. Huang and Zheng et al studied a Ru complex (Ru-2) with a PNP-pincer ligand, a dearomatized pyridine moiety with an imine arm [14] Using this catalyst for FADH, a TON of 95,000 was obtained under mild conditions without any additive (50 ◦C, in DMSO), with a TOF of 2380 h−1. Ddeevveellooppeedd aa RRuu ccoommpplleexx ((RRuu--44)) wwiitthh aa bbiissiimmiiddaazzoolliinnee lliiggaanndd ffoorr FFAADDHH iinn HH22OO bbeeccaauussee LLii eett aall.. Ddeemmoonnssttrraatteedd tthhaatt tthhee bbiissiimmiiddaazzoolliinnee lliiggaanndd ooff aann IIrr ccoommpplleexx wwaass eeffffeeccttiivvee ffoorr FFAADDHH [[1166,,3322]]. AAlltthhoouugghh tthhee ccaattaallyyttiicc aaccttiivviittyy ooff tthhee RRuu ccoommpplleexx wwaasslloowweerrtthhaanntthhaattoofftthheeIIrraannaalloogg,,aaTTOOFFooff1122,0,00000hh−−11 aannddTTOONN ooff 335500,,000000 wweerree aacchhiieevveedd wwiitthh HHCCOOOONNaa aatt9900◦°CC..IInnaaddddititioionn,,hhigighhlylyppreressssuurirzizeeddHH2/2/CCOO22 ((2244 MMPPaa)) wwaass pmapmassrroooottrrhhddeeeeuuttcFFchheeAAaaddnnDD,, 1H1wHw..77iiccttmamhhattooiaialuulllllyiyittoossCCntntaOOaaattnn9c9cddo5o5TnnT◦°OttCCOaaFmmF[[11oioi77nnff]]aa.3.3tTt0T0ii6hooh67nnee7h..cch−RhhR−1a1aee,,rrccwaaweeccninittttteethhllrryyiRiR,,sstutMMuii-cc-5ii5ffllessebbttaaeeeettaiiauunnrrrriieeneengttoogfafaaalltt..hh99HoiioHssbb--cctataaaaacctitirrnaaniilldedeyyddiittnniiccaeae hhiigghh TTOONN ooff ppiinncceerr lliiggaanndd ssyysstteemm iiss tthhaatt iitt mmaaiinnttaaiinnss ccaattaallyyttiicc aaccttiivviittyy ffoorr ttwwoo mmoonntthhss aanndd hhaass hhiigghh dduurraabbiilliittyy iinn aa nneeaatt ssoollvveenntt. They concluded that the H2 release from FA in this manner could sufficiently feed a fuel cell vehicle that typically stores a high-purity carrier at 70 MPa, avoiding the need for a costly high-pressure pump
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
