Abstract: The poly-γ-(glycyl-glutamine)propylsiloxane supported palladium catalysts with different N/Pd molar ratio were synthesized and characterized.The data of the differential IRspectra indicated that the polysiloxane with glyeyl-glutamine dipeptide side chain was taken shape in the ligand, XPSanalysis shows that the activity center may be complex compound composed of the nitrogen of glyeyl-glutamine ligand and Pd atom in PdCl₂.Besides, the palladium of catalyst appeared in the form of Pd(0) and Pd(I).For a lot of substrates, the hydrogenation activity of the title complexes is high.The initial hydrogen absorption rate of acrylonitrile is-up to 3186 mL H₂/min·mmol Pd on the catalyst with the N/Pd ratio of 21.6.The hydrogenation of cyclopentadiene appeared to be a two-stage processi but in the 1,5-hexadiene case, the hydrogenation of two double bonds almost take place at the same time, though the reaction rates of both are different.The influences of the solvents and the molar ratio of N/Pd on catalytic activity were studied

Key words: Polymer catalyst, Glutamine, Polysilpxane, Hydrogenation activity