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Heterogenization; formic acid; hydrogen storage; CO2 activation
Abstract:
Molecular Ru complexes heterogenized on polyphosphine macroligands are identified as a highly active catalyst for the challenging direct hydrogenation of CO2 in an aqueous environment. In DMSO/H2O a TON of 2964 is reached and a high activity is retained in pure water (TON = 1500), due to stabilizing effects of the polyphosphine on the reaction. The chemical structure of the catalyst was elucidated through NMR, XPS and PDF analysis. Comparison with the homogenous analogue revealed that 44% of the activity is retained in the heterogeneous catalyst. The catalyst proved to be active over five hydrogen storage cycles, with no CO formation, and minor deactivation between 14-32%.
