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Keywords:

  • carbon;
  • gels;
  • oxidation;
  • platinum;
  • supported catalysts;
  • synthetic methods

Abstract

A high surface area, highly mesoporous carbon xerogel was synthesised and used as a support in the preparation of platinum–ruthenium catalysts by different synthetic routes. The platinum–ruthenium carbon xerogel catalysts were physico-chemically characterised and used for the chemical electro-oxidation of methanol. The synthetic routes pursued included: 1) impregnation with metal chloride precursors and reduction with two different reducing agents: sodium borohydride and formic acid; 2) a microemulsion-based method and 3) a sulfite complex method, which led to catalysts with different physico-chemical features that strongly influence their catalytic behaviour towards methanol oxidation. The electro-oxidation of methanol was found to depend on both the crystal size and the extent of active phase reduction as well as on the platinum concentration on the catalyst surface, which were maximised for the impregnation method and reduction with formic acid.