e (germanium), Sn (tin), or a lanthanide or actinide metal consisting of La (lanthanum), Nd (neodymium), Sm (samarium), U (uranium), Pu (plutonium; M' is a metal selected from the group of metals that can catalyze hydrogenation and hydrogenolysis reactions of unsaturated and saturated organic ligands, L and R, to yield volatile byproducts and also can catalyze the hydrogenation of surface carbon t