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Crystals 2017, 7(6), 159; doi:10.3390/cryst7060159

The CeOX and MnOX Nanocrystals Supported on TiO2–Graphene Oxide Catalysts and Their Selective Catalytic Reduction Properties at Low Temperature

1
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing key laboratory of resource-oriented treatment of industrial pollutants, Beijing 100083, China
3
China Metallurgical Industry Planning and Research Institute, Beijing 100711, China
*
Author to whom correspondence should be addressed.
Academic Editors: Roberto Comparelli, Lucia Curri and Marinella Striccoli
Received: 23 February 2017 / Revised: 26 May 2017 / Accepted: 29 May 2017 / Published: 2 June 2017
(This article belongs to the Special Issue Colloidal Nanocrystals: Synthesis, Characterization and Application)
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Abstract

A series of 9%CeOx–MnOx/TiO2–GO nanocomposites with different molar ratios of Ce/Mn were synthesized by the sol-gel and ultrasonic impregnation methods and characterized by field emission scanning electron microscope (FESEM), high resolution transmission electron microscopy (HRTEM), N2 adsorption (BET) analysis, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT–IR). The results showed that various valences of Ce and Mn oxides were uniformly distributed on the surface of TiO2–GO multilayered supports. The coexistence of various valences of Ce and Mn oxides can improve the redox performance of the catalyst. With the introduction of Ce, the amount of MnO2 and non-stoichiometric MnOx/Mn, the total oxygen and chemisorbed oxygen content, and the electron transfer ability of the catalyst increased significantly. When the molar ratio of Ce/Mn was 0.3, the catalysts exhibited high selective catalytic reduction activity (more than 99% at 180 °C) and N2 selectivity. The presence of hydrophilic groups on the surface of the GO was considered as the critical factor influencing the H2O resistance of the catalyst. Due to the pre-sulfuring process of GO, serious sulfation of the active component can be prevented, and the catalyst exhibited excellent SO2 resistance. View Full-Text
Keywords: nanocrystal; selective catalytic reduction; graphene oxide; cerium oxides; manganese oxides nanocrystal; selective catalytic reduction; graphene oxide; cerium oxides; manganese oxides
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tong, Z.; Lu, X.; Song, C. The CeOX and MnOX Nanocrystals Supported on TiO2–Graphene Oxide Catalysts and Their Selective Catalytic Reduction Properties at Low Temperature. Crystals 2017, 7, 159.

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