Agglomerated polymer monoliths with bimetallic nano-particles as flow-through micro-reactors

Patrick Floris, Brendan Twamley, Pavel N. Nesterenko, Brett Paull, Damian Connolly

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalMicrochimica Acta
Volume179
Issue number1-2
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

Keywords

  • Agglomerated monolith
  • Flow-through catalysis
  • Micro-reactor
  • Nano-particles

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