Fig. 2: Catalytic experiments for the semihydrogenation reaction.

a,b, Effect of H2:acetylene stoichiometry (a) and temperature (b) on the selective acetylene hydrogenation with Pd1Au1@1. c, Stability over time for Pd1Au1@1 under optimal reaction conditions: 10:1 H2:acetylene ratio, 33 ml min−1 of 1% acetylene in ethylene, 24 h reaction time and 100 °C reaction temperature.