Palladium-loaded polymeric membranes

Volkov V. V, Petrova I. V, Lebedeva V. I., Roldughin V. I. and Tereshchenko G.F. (2011), Palladium-loaded polymeric membranes for hydrogenation in catalytic membrane reactors, in A. Basile and F. Gallucd (Eds), Membranes for Membrane Reactors Preparation, Optimization and Selection, John Wiley Sons Ltd, Chichester, UK, 531-548. 

The reactions were carried out over polymeric catalytic membranes consisting of poly(ether block amide) (PEBA) or blends of PEBA and poly(vinylpyrrolidone) (PVP) loaded with palladium nanoclusters. These membranes were used to simultaneously hydrogenate and concentrate the organic compounds in the permeate side by catalytic pervaporation. The pervaporative enrichment of the organics was achieved by a factor of 100, and a significant conversion was only obtained when the catalytic membranes were employed in pervaporation mode. 

The selective hydrogenation of propyne to propene has been studied over porous ultraflltration polymeric membranes of polyacrylonitrile (PAN), polyetherimide (PEI) or polyamideimide (PAI) or over poly(acrylic acid) membranes, treated with palladium acetate. Similarly, porous PVDF membranes, also loaded with palladium particles, were used in hydrogenation flow-through experiments of methylenecyclohexane to methylcy-clohexanone. The hydrogenation of viscous liquids such as vegetable oils could also be performed in flow-through experiments over porous polymeric membranes loaded with palladium or platinum particles. " ... 

Low-loaded, organophilic Pd-montmorillonites were shown to exhibit high cis-selectivity in the hydrogenation of 1-phenyl-1-alkynes working with high (=5000) substrate catalyst ratio.402 Studies with respect to the use palladium membrane catalysts403 105 and polymeric hollow fiber reactors406"408 were reported. 

---