Fig. 4: Catalytic performance of tandem system under different reaction conditions.
From: CO2 hydrogenation to acetic acid and methyl acetate via tandem catalysis
a Product distribution and b Space-time yield of C2+ oxygenates under temperature changes in upper and lower beds. c Effect of total pressure and d space velocity on the reaction. e Long-term stability test of tandem system. Reaction conditions for a and b: H2/CO2/Ar = 71.25/23.75/5, P = 5.0 MPa, 1200 mL gcat−1 h−1; for (c), H2/CO2/Ar = 71.25/23.75/5, T (upper bed) = 623 K, T (lower bed) = 558 K, 1200 mL gcat−1 h−1; for (d), H2/CO2/Ar = 71.25/23.75/5, T (upper bed) = 623 K, T (lower bed) = 558 K, P = 5.0 MPa. e H2/CO2/Ar = 71.25/23.75/5, T (upper bed) = 623 K, T (lower bed) = 558 K, P = 5.0 MPa, 1200 mL gcat−1 h−1. Catalyst loading: upper bed, 0.5 g GaZrOx; lower bed, mixture containing 0.5 g of MOR-8-C1 and 0.5 g of PC. The selectivity of organics was calculated on a molar carbon basis (CO free). Error bars indicate the standard deviation (<5%) of MA + AA selectivity measured over a 3 h period.
