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.
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Tim White is currently Associate Professor at the School of Materials Science and Engineering and Director of the Facility for Advanced Characterisation, Testing & Simulation (FACTS). He has over twenty years of experience in the design and demonstration of advanced materials for environmental, superconducting, ionic conductivity and hydrogen storage applications. His particular interests lie in tailoring ceramics at the atomic scale to develop or enhance particular properties. These studies have been supported and facilitated through the use and deep knowledge of advanced characterization methods, including atomic resolution electron microscopy, crystal refinement using X-ray and neutron diffraction, and synchrotron-based surface analysis for the investigation of chemical states and molecular environments.
Nopphawan Phonthammachai is currently a Research Fellow at the School of Materials Science and Engineering, Nanyang Technological University, Singapore. Her research interests are the designing of new materials (apatite based-, functionalized-, composite, nanomaterials) and developing of in-house metal oxide (TiO2, ZrO2, Fe2O3 etc.) synthesis routes using simple chemistrybased processes for catalytic, environmental and biological applications.
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Phonthammachai, N., Ziyi, Z., Jun, G. et al. Synthesis of high performance hydroxyapatite-gold catalysts for CO oxidation. Gold Bull 41, 42–50 (2008). https://doi.org/10.1007/BF03215622
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DOI: https://doi.org/10.1007/BF03215622