Integrated Recovery and Recycling of Homogeneous Catalysts by Reverse Flow Adsorption: Selection of Suitable Adsorbents

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Dunnewijk, Jeroen and Bosch, Hans and Haan de, Andre B. (2005) Integrated Recovery and Recycling of Homogeneous Catalysts by Reverse Flow Adsorption: Selection of Suitable Adsorbents. Adsorption, 11 (Suppl.). pp. 521-526. ISSN 0929-5607

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Abstract:A promising concept for the recovery of homogeneous catalysts is Reverse Flow Adsorption. In actual homogeneous catalyzed processes, a homogeneous transition-metal catalyst is at equilibrium with its free transition-metal center and ligands. Therefore, to apply Reverse Flow Adsorption, a combination of two adsorbents has to be used to reversibly adsorb: the transition-metal center and its ligands. The transition-metal center can be adsorbed by a suitable ligand immobilized onto a solid carrier, while the ligand is adsorbed by an immobilized transition-metal. Two groups of potential adsorbents were selected by the Hard and Soft Acid and Base (HSAB) theory for the adsorption of Co(II) and PPh3: (1) phosphor (polymer bound PPh3), sulfur (polymer bound methylsufanylmethyl) and chloride (polymer bound benzylchloride) functionalized adsorbents and (2) metal (Ag+, Co2 + and Na+) functionalized Amberlyst 15. The CoCl2 adsorption decreased, as predicted by the HSAB theory, according to: P > S > Cl. Metal functionalized adsorbents adsorbed the PPh3 with capacities decreasing as predicted by the HSAB theory: Ag+ > Co2 + > Na+. All adsorption interactions proved to be reversible.
Item Type:Article
Copyright:© 2005 Springer
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Link to this item:http://purl.utwente.nl/publications/67312
Official URL:http://dx.doi.org/10.1007/s10450-005-5978-4
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