UNUSUAL EFFECT OF RU COMPLEXES ON THE PERMEATION OF CARBON-MONOXIDE AND OXYGEN GAS-MIXTURE THROUGH POLYCARBONATE MEMBRANE

20 wt% RuCl3 . 3H(2)O-containing polycarbonate membranes are prepared by using co-solvent and using these metal-containing membranes, over 9 9% of pure oxygen (O-2) gas was recovered from a 1:1 mixture of O-2 an d CO gas mixture at room temperature. Under the described conditions, the Ru complexes are inert to oxygen, but quite reactive to carbon mon oxide gas molecules. Very stable Ru-carbonyl species are found to be f ormed during the gas permeation in the membrane, indicating that there are relatively strong interaction between CO gas molecules and the Ru complexes incorporated into the polycarbonate membrane. Such preferen tial interactions are believed to give rise to a drastic change in per meation selectivity of a organic polymer membrane.