Synthesis of high performance hydroxyapatite-gold catalysts for CO oxidation

Nopphawan Phonthammachai*, Zhong Ziyi, Guo Jun, Han Yi Fan, T. J. White

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Catalysts for low temperature CO oxidation were prepared by decorating hydroxyapatite (HAp) ceramic foam scaffolds with highly dispersed gold nanocrystals using a deposition-precipitation (DP) process. Catalytic activity, microstructure and crystallinity were studied as a function of reagent pH (4-12) and aging time (10, 30, 60 min) for powders and porous supports. Superior products with small (≤5 nm) gold crystals distributed homogeneously over HAp foam were obtained at pH 8-9. Larger crystal sizes and colloidal gold agglomeration appeared at longer aging times. The optimized catalyst prepared by reaction at pH 9 for 30 min showed 100% CO conversion to CO2 at 150°C. The Au-HAp composite demonstrated excellent durability by retaining structural and crystallographic integrity with no loss of activity when tested at 65°C out to 166 h.

Original languageEnglish
Pages (from-to)42-50
Number of pages9
JournalGold Bulletin
Volume41
Issue number1
DOIs
StatePublished - 2008
Externally publishedYes

Keywords

  • CO oxidation
  • Deposition-precipitation process
  • Gold nanocrystal
  • Hydroxyapatite

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