“…In general, the Pd-based catalysts are more selective towards the C=C bond hydrogenation. Pt [16], Ru [17,18], Au [19], Ir [20] and Ni-Co bimetallic [21] catalysts have been reported to be selective for the hydrogenation of C=O to unsaturated alcohol. On the other hand, Pd [12,[21][22][23][24], Ni [25], Rh [26], Pt [9], Pt-Au [9] are selective for the hydrogenation of C=C to form saturated aldehyde.…”