Synthesis of high performance hydroxyapatite-gold catalysts for CO oxidation

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

doi:10.1007/BF03215622

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 journal › Article › peer-review

44 Citations (Scopus)

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 language	English
Pages (from-to)	42-50
Number of pages	9
Journal	Gold Bulletin
Volume	41
Issue number	1
DOIs	https://doi.org/10.1007/BF03215622
Publication status	Published - 2008
Externally published	Yes

ASJC Scopus Subject Areas

General Materials Science
Inorganic Chemistry

Keywords

CO oxidation
Deposition-precipitation process
Gold nanocrystal
Hydroxyapatite

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10.1007/BF03215622

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title = "Synthesis of high performance hydroxyapatite-gold catalysts for CO oxidation",

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.",

keywords = "CO oxidation, Deposition-precipitation process, Gold nanocrystal, Hydroxyapatite",

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T1 - Synthesis of high performance hydroxyapatite-gold catalysts for CO oxidation

AU - Phonthammachai, Nopphawan

AU - Ziyi, Zhong

AU - Jun, Guo

AU - Fan, Han Yi

AU - White, T. J.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - CO oxidation

KW - Deposition-precipitation process

KW - Gold nanocrystal

KW - Hydroxyapatite

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Synthesis of high performance hydroxyapatite-gold catalysts for CO oxidation

Abstract

ASJC Scopus Subject Areas

Keywords

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