Ru-Nitrosyl Complex Salts as Efficient Catalysts for the Reversible CO 2 Hydrogenation/FA Dehydrogenation in Ionic Liquids
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide We demonstrate that bench-stable ruthenium-PNP nitrosyl complex salts with different counteranions (Cl –, BF 4 –, BPh 4 –, PF 6 –, and OTs – ) and a ruthenium-POP nitrosyl complex are competent (pre)catalysts for the CO 2 hydrogenation to formic acid (FA) at low temperatures in ionic liquids. Only a minor effect of variation of the counteranion was observed, and weakly basic ionic liquids such as EMIM OAc, BMIM OAc, and EMIM HCO 2 were suitable for this transformation, affording conversions up to 94 mol % formic acid compared to the ionic liquid (FA/IL) and turnover numbers (TONs) up to 1305. Importantly, the same catalytic system was also efficient for the dehydrogenation of formic acid back to CO 2 and H 2, affording conversions up to >95% (949 TON) after 3 h at 95 °C. To investigate the application of such protocols for hydrogen storage and transportation purposes, hydrogenation/dehydrogenation cycles were performed, showing that this new catalytic system can promote up to 10 reversible CO 2 hydrogenation/FA dehydrogenation cycles before losing its activity.
Source: JACS Au
Institutions: Universidade de São Paulo, Technical University of Denmark
Language: English
Subfield: Process Chemistry and Technology
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,500
OpenAlex ID: W4409450363