Cerium phosphate-supported Au catalysts for CO oxidation

doi:10.1016/j.cjche.2017.08.008

Abstract

Abstract: LaPO₄ and hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) are typical metal phosphates recently found to be useful for making supported metal or metal oxide catalysts, but CePO₄ (also belonging to the metal phosphate family) has been rarely used to make supported catalysts. It would be interesting to develop CePO₄-supported catalysts and explore their catalytic applications. Herein, hexagonal CePO₄ nanorods (denoted as CePO₄-H), hexagonal CePO₄ nanowires (CePO₄-HNW), monoclinic CePO₄ nanoparticles (CePO₄-M), and monoclinic CePO₄ nanowires (CePO₄-MNW) prepared by different methods were used to support gold via deposition-precipitation with urea (DPU). The gold contents of these catalysts were all around 1 wt%. The catalytic activities of these Au/CePO₄ catalysts in CO oxidation were found to follow the sequence of Au/CePO₄-MNW > Au/CePO₄-HNW > Au/CePO₄-M > Au/CePO₄-H. These catalysts were characterized by inductively coupled plasma-optical emission spectroscopy (ICP-OES), N₂ adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), oxygen temperature-programmed desorption (O₂-TPD), and CO₂ temperature-programmed desorption (CO₂-TPD) to find possible correlations between the physicochemical properties and catalytic activities of these catalysts.

Key words: Gold, Catalysis, Catalyst support, CePO₄, Carbon monoxide, Oxidation

摘要： LaPO₄ and hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) are typical metal phosphates recently found to be useful for making supported metal or metal oxide catalysts, but CePO₄ (also belonging to the metal phosphate family) has been rarely used to make supported catalysts. It would be interesting to develop CePO₄-supported catalysts and explore their catalytic applications. Herein, hexagonal CePO₄ nanorods (denoted as CePO₄-H), hexagonal CePO₄ nanowires (CePO₄-HNW), monoclinic CePO₄ nanoparticles (CePO₄-M), and monoclinic CePO₄ nanowires (CePO₄-MNW) prepared by different methods were used to support gold via deposition-precipitation with urea (DPU). The gold contents of these catalysts were all around 1 wt%. The catalytic activities of these Au/CePO₄ catalysts in CO oxidation were found to follow the sequence of Au/CePO₄-MNW > Au/CePO₄-HNW > Au/CePO₄-M > Au/CePO₄-H. These catalysts were characterized by inductively coupled plasma-optical emission spectroscopy (ICP-OES), N₂ adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), oxygen temperature-programmed desorption (O₂-TPD), and CO₂ temperature-programmed desorption (CO₂-TPD) to find possible correlations between the physicochemical properties and catalytic activities of these catalysts.

关键词: Gold, Catalysis, Catalyst support, CePO₄, Carbon monoxide, Oxidation

Yulin Wang, Huan Liu, Zhen Ma. Cerium phosphate-supported Au catalysts for CO oxidation[J]. Chin.J.Chem.Eng., 2018, 26(10): 2055-2063.

Yulin Wang, Huan Liu, Zhen Ma. Cerium phosphate-supported Au catalysts for CO oxidation[J]. Chinese Journal of Chemical Engineering, 2018, 26(10): 2055-2063.

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