“…Economic aspects associated with the high Pd loading and the toxicity of lead together with stricter environmental regulations have driven the search for new alternatives [15,19]. The selectivity to alkenes is also significantly improved for binary bimetallic Pd-M particles (e.g., with M = Cu [20], Ag [21][22][23], Au [24], Zn [6], Ga [25,26], In [27][28][29], Sn [30], or Bi [31]) or even ternary Pd-based phases (such as Pd-Bi-Se [32] or Pd-Ga-Sn [33,34]). In addition, non-precious, binary alloys (Ni-Fe or Ni-Ga) [35,36], intermetallic compounds (Al 13 Fe 4 ) [37], transition metal-free Zintl phases (BaGa 2 ), or non-precious, ternary phases (Cu-Ni-Fe) [38] have been reported as catalysts for semi-hydrogenation of alkynes in the gas or liquid phase.…”