ETHANOL CONVERSION ON DODEHETEROPOLYACIDS SUPPORTED ON CONJUGATED POLYMERS

The paper summarizes and discusses the results of the investigation of catalytic and physico-chemical properties of dodecaheteropolyacid (HP A): H3PMo12O40, H3PW12O40 and H4SiW12O40 supported on conjugated polym ers (polyacetylene, polypyrrole and polyaniline). The catalysts obtain ed by a two-steps procedure (synthesis of polymer and the entrapment o f heteropolyacid as separate operations) are more active in ethanol co nversion than the unsupported ones. In the case of tungsten containing catalysts the acid-base type catalytic activity predominates yielding ethylene and diethyl ether. Molybdenum containing catalysts are mainl y redox catalysts and acetaldehyde is the most important product. The nature of the acid and redox catalytically active centres in the inves tigated catalysts is discussed.