Fig. 6. Conversion/time profile of the hydrogenation of CO₂ to methanol using catalyst 2 (12.5 μmol catalyst 2; 12.5 μmol HNTf₂, 20 bar CO₂ + 60 bar H₂ at r.t.; 140 °C reaction temperature; 2.08 mL THF), as obtained from batch experiments terminated at the given reaction times. In the case of the reaction terminated after 32 h the autoclave was re-pressurised to the initial pressure with p(CO₂)/p(H₂) = 1/3 after 16 h (▲). In the case of the reaction terminated after 48 h the autoclave was re-pressurised after 16 h and again after 32 h ([black circle]).