Catalytic reactivity and surface chemistry of polyaniline(EB)-Pd-H2O systems

Catalytic reactivity and surface chemical effects induced by the presence o f water in the molecular system polyaniline(EB)-Pd-H2O were investigated. T he polyaniline(EB) doped with palladium reveals its high activity and selec tivity in the semihydrogenation: hexyne --> hexenes (--> hexane). However, to demonstrate these effects, the specimen has to be submitted to a special treatment to lose most of its water. The XPS analysis allowed identificati on of the catalytically active sites of the studied system. They were ascri bed to the [PdCl4](2-) complex anions present at the surface of the dry spe cimens.