Morphology-Dependent Properties of Cu-CeO2 Catalysts for the Water-Gas Shift ReactionReportar como inadecuado


Morphology-Dependent Properties of Cu-CeO2 Catalysts for the Water-Gas Shift Reaction


Morphology-Dependent Properties of Cu-CeO2 Catalysts for the Water-Gas Shift Reaction - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

State Key Laboratory of Chemical Resources Engineering, Beijing University of Chemical Technology, Beijing 100029, China





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Academic Editors: Enrique Rodríguez-Castellón, Agustín Bueno-López and Elisa Moretti

Abstract CeO2 nanooctahedrons, nanorods, and nanocubes were prepared by the hydrothermal method and were then used as supports of Cu-based catalysts for the water-gas shift WGS reaction. The chemical and physical properties of these catalysts were characterized by X-ray diffraction XRD, transmission electron microscopy TEM, N2 adsorption-desorption, UV-Vis spectroscopy, X-ray photoelectron spectroscopy XPS, hydrogen temperature-programmed reduction H2-TPR and in situ diffuse reflectance infra-red fourier transform spectroscopy DRIFTS techniques. Characterization results indicate that the morphology of the CeO2 supports, originating from the selective exposure of different crystal planes, has a distinct impact on the dispersion of Cu and the catalytic properties. The nanooctahedron CeO2 catalyst Cu-CeO2-O showed the best dispersion of Cu, the largest amount of moderate copper oxide, and the strongest Cu-support interaction. Consequently, the Cu-CeO2-O catalyst exhibited the highest CO conversion at the temperature range of 150–250 °C when compared with the nanocube and nanorod Cu-CeO2 catalysts. The optimized Cu content of the Cu-CeO2-O catalysts is 10 wt % and the CO conversion reaches 91.3% at 300 °C. A distinctive profile assigned to the evolution of different types of carbonate species was observed in the 1000–1800 cm−1 region of the in situ DRIFTS spectra and a particular type of carbonate species was identified as a potential key reaction intermediate at low temperature. View Full-Text

Keywords: Cu-CeO2 catalysts; WGS reaction; morphology dependence; metal-support interaction Cu-CeO2 catalysts; WGS reaction; morphology dependence; metal-support interaction





Autor: Zhibo Ren, Fei Peng, Jianwei Li * , Xin Liang and Biaohua Chen

Fuente: http://mdpi.com/



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