Alkyne conversions(circles) and alkene selectivities (triangles) for (A) Co2FeGe, (B) Co2Mn0.5Fe0.5Ge,(C) Co2MnGe, (D) Co2FeGa0.25Ge0.75, (E) Co2FeGa0.5Ge0.5, and(F) Co2FeGa. Closed andopen symbols represent results for hydrogenations of C3H4 in C3H6 and C2H2 in C2H4,respectively. Reactants were [0.1%alkynes/10%alkenes/40% H2/He balance]. Selectivitiesin low-conversion region are not shown due to large errors.