The use of ion exchange resins in the recycle of palladium catalysts for the synthesis of polyketones

Abstract

In the present work, three methods were employed to find ways of recycling palladium catalysts. Ion exchange resins were used as carriers to prepare resin-supported palladium catalysts and the reusability of this catalyst in the preparation of polyketone by copolymerization of carbon monoxide and styrene was investigated. Additionally, the feasibility of recycling the expensive palladium catalysts was examined by two methods: (1) absorbing the effective components in the after-treatment solution of polyketone and reusing them; (2) condensing the after-treatment solution of polyketone and reusing it as a catalyst to investigate its catalytic activity. The structure of the copolymer was determined by IR, TGA, DSC, etc. The results showed that the resin-supported palladium catalyst was active and could be reused. Furthermore, the ion exchange resin D-72 can adsorb Pd 2+, Cu 2+, etc., in the after-treatment solution of the copolymerization. The catalytic activity of reused catalyst reached about 474 g/g h. The condensed after-treatment solution showed good catalytic activity in the copolymerization of carbon monoxide and styrene.