Journal
MATERIALS
Volume 7, Issue 12, Pages 8105-8130Publisher
MDPI
DOI: 10.3390/ma7128105
Keywords
metal phosphate; hydroxyapatite; Pt catalyst; CO oxidation
Categories
Funding
- National Natural Science Foundation of China [21177028]
- Overseas Returnees Start-Up Research Fund of the Ministry of Education in China
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Oxides (such as SiO2, TiO2, ZrO2, Al2O3, Fe2O3, CeO2) have often been used to prepare supported Pt catalysts for CO oxidation and other reactions, whereas metal phosphate-supported Pt catalysts for CO oxidation were rarely reported. Metal phosphates are a family of metal salts with high thermal stability and acid-base properties. Hydroxyapatite (Ca-10(PO4)(6)(OH)(2), denoted as Ca-P-O here) also has rich hydroxyls. Here we report a series of metal phosphate-supported Pt (Pt/M-P-O, M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts for CO oxidation. Pt/Ca-P-O shows the highest activity. Relevant characterization was conducted using N-2 adsorption-desorption, inductively coupled plasma (ICP) atomic emission spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), CO2 temperature-programmed desorption (CO2-TPD), X-ray photoelectron spectroscopy (XPS), and H-2 temperature-programmed reduction (H-2-TPR). This work furnishes a new catalyst system for CO oxidation and other possible reactions.
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