Rh2O3/hexagonal CePO4 nanocatalysts for N2O decomposition

doi:10.1007/s11705-017-1659-6

Front. Chem. Sci. Eng.

2017, Vol. 11

Issue (4) : 586-593 https://doi.org/10.1007/s11705-017-1659-6

RESEARCH ARTICLE

Rh₂O₃/hexagonal CePO₄ nanocatalysts for N₂O decomposition

Huan Liu, Zhen Ma(

)

Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China

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Abstract

Hexagonal CePO₄ nanorods were prepared by a precipitation method and hexagonal CePO₄ nanowires were prepared by hydrothermal synthesis at 150 °C. Rh(NO₃)₃ was then used as a precursor for the impregnation of Rh₂O₃ onto these CePO₄ materials. The Rh₂O₃ supported on the CePO₄ nanowires was much more active for the catalytic decomposition of N₂O than the Rh₂O₃ supported on CePO₄ nanorods. The stability of both catalysts as a function of time on stream was studied and the influence of the co-feed (CO₂, O₂, H₂O or O₂/H₂O) on the N₂O decomposition was also investigated. The samples were characterized by N₂ adsorption-desorption, inductively coupled plasma optical emission spectroscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, hydrogen temperature-programmed reduction, oxygen temperature-programmed desorption, and CO₂ temperature-programmed desorption in order to correlate the physicochemical and catalytic properties.

Keywords Rh₂O₃ CePO₄ N₂O decomposition

Corresponding Author(s): Zhen Ma

Just Accepted Date: 10 May 2017 Online First Date: 14 July 2017 Issue Date: 06 November 2017

Cite this article:

Huan Liu,Zhen Ma. Rh₂O₃/hexagonal CePO₄ nanocatalysts for N₂O decomposition[J]. Front. Chem. Sci. Eng., 2017, 11(4): 586-593.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-017-1659-6
https://academic.hep.com.cn/fcse/EN/Y2017/V11/I4/586

Fig.1 XRD patterns of Rh₂O₃/CePO₄ catalysts

Fig.2 TEM and HRTEM images of Rh₂O₃/CePO₄ catalysts

Fig.3 N₂O conversions over Rh₂O₃/CePO₄ catalysts and CePO₄ supports

Fig.4 Stabilities of the Rh₂O₃/CePO₄-nanorods and Rh₂O₃/CePO₄-nanowires for N₂O decomposition

Fig.5 The influence of co-feed 2% CO₂, 5% O₂, 2% H₂O, or 5% O₂+2% H₂O on the conversion of N₂O over (a) Rh₂O₃/CePO₄-nanorods and (b) Rh/CePO₄-nanowires

Fig.6 N₂O conversion over Rh₂O₃/CePO₄-nanorods in the presence of 5% O₂ or 2% H₂O at 400 °C

Fig.7 N₂O conversion over Rh₂O₃/CePO₄-nanowires in the presence of 5% O₂ or 2% H₂O at 350 °C

Fig.8 CO₂-TPD profiles of Rh₂O₃/CePO₄ catalysts

Fig.9 O₂-TPD profiles of Rh₂O₃/CePO₄ catalysts

Fig.10 H₂-TPR profiles of Rh₂O₃/CePO₄ catalysts

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