Rh2O3/monoclinic CePO4 composite catalysts for N2O decomposition and CO oxidation

doi:10.1016/j.cjche.2017.02.007

摘要/Abstract

摘要： CePO₄ (in particular, monoclinic CePO₄) has been rarely used to make supported catalysts. Herein, monoclinic CePO₄ nanoparticles were prepared by calcining hexagonal CePO₄ nanorods (prepared by precipitation) in air at 900℃. Monoclinic CePO₄ nanowires were prepared by calcining hexagonal CePO₄ nanowires (prepared by hydrothermal synthesis at 150℃) in air at 900℃. Both monoclinic CePO₄ materials were used to support Rh₂O₃ by impregnation using Rh(NO₃)₃ as a precursor (followed by calcination). The catalytic performance of Rh₂O₃/monoclinic CePO₄ composite materials in N₂O decomposition and CO oxidation was investigated. It was found that Rh₂O₃ supported on monoclinic CePO₄ nanowires was much more active than Rh₂O₃ supported on monoclinic CePO₄ nanoparticles. The stability of catalysts as a function of reaction time on stream was studied in both reactions. The influence of co-fed CO₂, O₂, and H₂O on the catalytic activity in N₂O decomposition was also studied. These catalysts were characterized by employing N₂ adsorption-desorption, ICP-OES, XRD, TEM, XPS, H₂-TPR, O₂-TPD, and CO₂-TPD. The correlation between physicochemical properties and catalytic properties was discussed.

关键词: Rh₂O₃, CePO₄, N₂O decomposition, CO oxidation, Catalyst

Abstract: CePO₄ (in particular, monoclinic CePO₄) has been rarely used to make supported catalysts. Herein, monoclinic CePO₄ nanoparticles were prepared by calcining hexagonal CePO₄ nanorods (prepared by precipitation) in air at 900℃. Monoclinic CePO₄ nanowires were prepared by calcining hexagonal CePO₄ nanowires (prepared by hydrothermal synthesis at 150℃) in air at 900℃. Both monoclinic CePO₄ materials were used to support Rh₂O₃ by impregnation using Rh(NO₃)₃ as a precursor (followed by calcination). The catalytic performance of Rh₂O₃/monoclinic CePO₄ composite materials in N₂O decomposition and CO oxidation was investigated. It was found that Rh₂O₃ supported on monoclinic CePO₄ nanowires was much more active than Rh₂O₃ supported on monoclinic CePO₄ nanoparticles. The stability of catalysts as a function of reaction time on stream was studied in both reactions. The influence of co-fed CO₂, O₂, and H₂O on the catalytic activity in N₂O decomposition was also studied. These catalysts were characterized by employing N₂ adsorption-desorption, ICP-OES, XRD, TEM, XPS, H₂-TPR, O₂-TPD, and CO₂-TPD. The correlation between physicochemical properties and catalytic properties was discussed.

Key words: Rh₂O₃, CePO₄, N₂O decomposition, CO oxidation, Catalyst

Huan Liu, Zhen Ma. Rh₂O₃/monoclinic CePO₄ composite catalysts for N₂O decomposition and CO oxidation[J]. Chinese Journal of Chemical Engineering, 2018, 26(1): 109-115.

Huan Liu, Zhen Ma. Rh₂O₃/monoclinic CePO₄ composite catalysts for N₂O decomposition and CO oxidation[J]. Chin.J.Chem.Eng., 2018, 26(1): 109-115.

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Rh₂O₃/monoclinic CePO₄ composite catalysts for N₂O decomposition and CO oxidation

Rh₂O₃/monoclinic CePO₄ composite catalysts for N₂O decomposition and CO oxidation

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