Fig. 2. Effects of (a) catalyst concentration, (b) reaction temperature, (c) reaction time, (d) CO2 pressure on the yield of CMS. (Reaction conditions: (a) 120 °C, 1.0 MPa, 18 h; (b) catalyst concentration 8 mol%, 1.0 MPa, 18 h; (c) catalyst concentration 8 mol%, 120 °C, 1.0 MPa; (d) catalyst concentration 8 mol%, 120 °C, 30 h.).
