Fig. 4. Catalytic performances in C2H2 hydrogenation for Pd/ZnO catalysts with varying surface Zn ratios. (a) Selectivity for C2H4 and conversion of C2H2 over different Pd/ZnO catalysts; data obtained at 60 °C. (b) Conversion of C2H2 and selectivity for C2H4 over different Pd/ZnO catalysts; data obtained at various reaction temperatures. Reaction conditions: 2% C2H2, 20% H2, Ar balance gas; 0.1 g catalyst; 2 hours; 18 000 mL gcat−1 h−1.
