Morphology-Dependent Properties of Cu-CeO2 Catalysts for the Water-Gas Shift ReactionReport as inadecuate


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 - Download this document for free, or read online. Document in PDF available to download.

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





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

Source: http://mdpi.com/



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