Tertiary Amine‐Ethylene Glycol Based Tandem CO 2 Capture and Hydrogenation to Methanol: Direct Utilization of Post‐Combustion CO 2

Carbon dioxide capture using tertiary amines in ethylene glycol solvent was performed under ambient conditions. Subsequently, the CO 2 captured as alkyl carbonate salts was successfully hydrogenated to methanol, in the presence of H 2 gas and Ru‐Macho‐BH catalyst. A comprehensive series of tertiary amines were selected for the integrated capture and conversion process. While most of these amines were effective for CO 2 capture, tetramethylethylenediamine (TMEDA) and tetramethylbutanediamine (TMBDA) provided the best CH 3 OH yields. Deactivation of the base due to side reactions was significantly minimized and substantial base regeneration was observed. The proposed system was also highly efficient for CO 2 capture from a gas mixture containing 10 % CO 2 , as found in flue gases, followed by tandem conversion to CH 3 OH. We postulate that such high boiling tertiary amine‐glycol systems as dual capture and hydrogenation solvents are promising for the realization of a sustainable and carbon‐neutral methanol economy in a scalable process.