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Adlayers of palladium particles and their aggregates on porous polypropylene hollow fiber membranes as hydrogenization contractors/reactors

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Author: Volkov, V.V. · Lebedeva, V.I. · Petrova, I.V. · Bobyl, A.V. · Konnikov, S.G. · Roldughin, V.I. · Erkel, J. van · Tereshchenko, G.F.
Source:Advances in Colloid and Interface Science, 1-2, 164, 144-155
Identifier: 429709
Keywords: Environment · Dissolved oxygen · Hydrogenation · Membrane contactor · Membrane reactor · Palladium nanoparticles · Polymeric catalytic membrane · Adlayers · Catalytic Membrane · Catalytic membrane reactors · Catalytic particles · Comprehensive studies · Controlled delivery · Dissolved oxygen removals · Free state · Hydrogenization · Individual fibers · Limiting stage · Membrane contactor · Membrane moduli · Membrane reactor · Membrane surface · Palladium nanoparticles · Palladium particles · Pd particle · Polymer membrane · Porous hollow-fiber membranes · Porous polypropylene hollow fibers · Primary particles · Aggregates · Bioreactors · Dissolution · Dissolved oxygen · Functional polymers · Hydrogenation · Membranes · Nanoparticles · Particle size analysis · Polymers · Scanning electron microscopy · Surface diffusion · Thermoplastics · Agglomeration · Earth & Environment · WT - Water Treatment · EELS - Earth, Environmental and Life Sciences


Principal approaches for the preparation of catalytic membrane reactors based on polymer membranes containing palladium nanoparticles and for the description of their characteristics are presented. The method for the development of adlayers composed of palladium nanoparticles and their aggregates on the surface of hydrophobic polypropylene porous hollow fiber membranes is proposed, and their comprehensive study is performed. Various regimes of the deposition of palladium on individual fibers and on membrane surface inside membrane modulus are considered. The sizes of primary Pd particles range from 10 to 500 nm, and dimensions of their aggregates vary from 200 nm to tens of microns. The sizes of primary particles in a free state and in their aggregates are estimated by the methods of X-ray analysis and scanning electron microscopy. The proposed approach is used for the preparation of catalytic membrane contactors/reactors for the removal of dissolved oxygen from water. In the systems under study, the limiting stage of dissolved oxygen removal is concerned with diffusion-controlled delivery of oxygen to the surface of catalytic particles. © 2010 Elsevier B.V. All rights reserved.