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Active Component Migration and Catalytic Properties of Nitrogen Modified Composite Catalytic Materials

1
Institute of Power Source and Eco-Materials Science, Hebei University of Technology, Tianjin 300130, China
2
Key Laboratory of Special Functional Materials for Ecological Environment and Information, Hebei University of Technology, Ministry of Education, Tianjin 300130, China
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(4), 125; https://doi.org/10.3390/catal8040125
Received: 2 February 2018 / Revised: 7 March 2018 / Accepted: 16 March 2018 / Published: 21 March 2018
(This article belongs to the Special Issue Catalytic Oxidation of Methane)
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Abstract

During the catalytic combustion reaction of methane, the migration of the active species on surface facilitates the catalytic reaction, and the element doping can improve the redox performance of the catalyst. Nitrogen-modified perovskite type composite catalysts were prepared by hydrothermal method and then characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), temperature-programmed reductions (TPR), and X-ray photoelectron spectra (XPS). The results revealed that nitrogen sources (urea, biuret, melamine, carbohydrazide, and semicarbazide hydrochloride) and nitrogen source addition changed the catalytic performance in physical and chemical properties, the migration of reactive species and the catalytic performance. When the addition amount of semicarbazide hydrochloride was three times that of LaCoO3, the composite catalysts had high Co3+/Co2+ (1.39) and Oads/Olat (15.18) and showed the best catalytic performance: the temperatures that are required for achieving methane conversion of 50% and 90% were 277 and 360 °C, which are more effective than noble metal oxides. Moreover, the in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were applied to elucidate the efficient for CH4 removal and also can further explain the surface reaction mechanism of the composite catalyst during the methane catalytic combustion. View Full-Text
Keywords: nitrogen modification; methane catalytic combustion; ion migration; in situ DRIFTS nitrogen modification; methane catalytic combustion; ion migration; in situ DRIFTS
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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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Li, M.; Gui, P.; Zheng, L.; Li, J.; Xue, G.; Liang, J. Active Component Migration and Catalytic Properties of Nitrogen Modified Composite Catalytic Materials. Catalysts 2018, 8, 125.

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