Fig. 5. Effect of density of Brønsted acid sites on catalytic behaviours of the bifunctional Zn–ZrO2/SSZ-13 catalyst. (a) CO conversion. (b) Product selectivity. The selectivity of CO2 did not change with the density of Brønsted acid sites and was in the range of 41–45%. Reaction conditions: catalyst, 0.60 g; H2/CO = 2; P = 3 MPa; T = 673 K; F = 30 mL min–1; time on stream, 10 h.
