Agglomerated polymer monoliths with bimetallic nano-particles as flow-through micro-reactors
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Polymer monoliths in capillary format have been prepared as solid supports for the immobilisation of platinum/palladium bimetallic nano-flowers. Optimum surface coverage of nano-flowers was realised by photografting the monoliths with vinyl azlactone followed by amination with ethylenediamine prior to nano-particle immobilisation. Field emission SEM imaging was used as a characterisation tool for evaluating nano-particle coverage, together with BET surface area analysis to probe the effect of nano-particle immobilisation upon monolith morphology. Ion exchange chromatography was also used to confirm the nature of the covalent attachment of nano-flowers on the monolithic surface. In addition, EDX and ICP analyses were used to quantify platinum and palladium on modified polymer monoliths. Finally the catalytic properties of immobilised bimetallic Pd/Pt nano-flowers were evaluated in flow-through mode, exploiting the porous interconnected flow-paths present in the prepared monoliths (pore diameter~1–2 μm). Specifically, the reduction of Fe (III) to Fe (II) and the oxidation of NADH to NAD+ were selected as model redox reactions. The use of a porous polymer monolith as an immobilisation substrate (rather than aminated micro-spheres) eliminated the need for a centrifugation step after the reaction.
KeywordsNano-particles Agglomerated monolith Micro-reactor Flow-through catalysis
The authors would like to thank Science Foundation Ireland (Grant number 08/SRC/B1412) for research funding under the Strategic Research Cluster programme and also for equipment funding (Grant. Number 03/IN.3/1361/EC07). Also special thanks to Dr. Dario Arrua for the assistance with BET analysis and UTAS for the use of the instrumentation.
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