Abstract: The behaviors of three supported coordination catalysts,PdCl₂-Tussah silk,PdCl₂PVP(polyvinylpyrrolidone),PdCl₂-PVP/Al₂O₃ in the hydrogenation of 1-hexene,1decone,2-ethyl-hexene,crotonaldehyde,cinnamaldehyde and cyclododecatriene were investigated,the activities of these substrates were different from catalyst to catalyst.The hydrogenation rates of the substrates with large space hindranceover PdCl₂-PVP catalyst were higher than that over PdCl₂-Tussah silk catalyst.The larger the space hindrance disparity,the more the difference between the activities of these two catalysts.Most of the substrates show higher activities in reaction over PdCl₂-PVP/Al₂O₃.The hydrogenation selectivities were also different for different catalysts.

Key words: Supported catalyst, Palladium catalyst, Hydrogenation catalyst