Precapture of CO₂ and Hydrogenation into Methanol on Heterogenized Ruthenium and Amine‐Rich Catalytic Systems

A heterogenized alternative to the homogeneous precapture of CO₂ with amines and subsequent hydrogenation to MeOH was developed using aminated silica and a Ru-MACHO^TM catalyst. Commercial mesoporous silica was modified with three different amino-silane monomers and used as support for the Ru catalyst. These composites were studied by TEM and solid-state NMR spectroscopy before and after the catalytic reaction. These catalytic reactions were conducted at 155 °C at a H₂ and CO₂ pressures of 75 and 2 bar, respectively, with the heterogeneous system (gas-solid) being probed with gas-phase infrared spectroscopy used to quantify the resulting products. High turnover number (TON) values were observed for the samples aminated with secondary amines.