RuCl3 . 3H2O complexes are incorporated into polysulfone (PS) as a dispersion medium using a cosolvent (tetrahydrofuran) in the metal complex concentration range of 5-30 wt.%. The interactions between Ru(III) complexes and PS are examined by infrared spectroscopy and thermal analyses (differential scanning calorimetry, DSC). The chemical reactivities of Ru in PS are investigated by reacting Ru sites with CO, H-2, O2, NO, D2, N2, and C2H4 gases in the static state under relatively mild conditions. Various Ru carbonyl, nitrosyl and hydride species formed in PS are characterized by infrared spectroscopic analyses and isotopic methods. Partial reduction of Ru(III) to Ru(II) is observed in reactions of the Ru-containing PS films with CO-H2O or H-2. These films show catalytic activities in the hydrogenation of ethylene, a water-gas shift reaction and reduction of NO under relatively mild conditions.