Solvent effects on high-pressure hydrogen gas generation by dehydrogenation of formic acid using ruthenium complexes

Masayuki Iguchi, Chao Guan, Kuo-Wei Huang, Hajime Kawanami

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

High-pressure H2 was produced by the selective dehydrogenation of formic acid (DFA) using ruthenium complexes at mild temperatures in various organic solvents and water. Among the solvents studied, 1,4-dioxane was the best candidate for this reaction to generate high gas pressure of 20 MPa at 80 °C using the Ru complex having a dearomatized pyridine-based pincer PN3P* ligand. This complex shows reusability for the high-pressure DFA in 1,4-dioxiane while maintaining the catalytic performance, however, deactivation occurred in other solvents. In dimethyl sulfoxide, its decomposition products may cause catalytic deactivation. The gas pressure generated in 1,4-dioxane was lower than that in water due to the high dissolution of 1,4-dioxane into CO2 according the vapor-liquid equilibrium calculations. The role of solvent is crucial since it affected the catalytic performance and also the generated gas pressure (H2 and CO2) from FA.
Original languageEnglish (US)
Pages (from-to)28507-28513
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number53
DOIs
StatePublished - May 23 2019

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