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Received November 30, 2015
Accepted February 1, 2016
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Catalytic activity of copper-ceria catalysts supported on different zeolites for CO oxidation
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
Korean Journal of Chemical Engineering, June 2016, 33(6), 1846-1854(9), 10.1007/s11814-016-0038-1
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Abstract
Copper-ceria catalysts for CO oxidation supported on 4A, 5A, NaX and NaY zeolites were prepared by incipient wetness impregnation and excess-solution impregnation. Catalysts were characterized by SEM, EDX, XRD, N2 adsorption-desorption, H2-TPR and XPS. Results revealed that the catalysts were greatly affected by zeolites and preparation method. EDX results indicated the metal loading of 4A-ES (5.1 wt% Cu, 15.7 wt% Ce), 5A-ES (5.9 wt% Cu, 19.2% Ce), NaX-ES (11.7wt% Cu, 4.2 wt% Ce) and NaY-ES (11.0 wt% Cu, 7.9 wt% Ce) greatly varied. TPR results suggested that the peak at around 195 oC was presented in NaX-ES and 4A-IW, standing for dispersed copper species that is very active for CO oxidation. The catalytic activity of 4A-ES and NaX-ES was the best among catalysts made by excess-solution impregnation, demonstrated by the lowest T50 at 127 and 129 ℃, respectively. The catalytic activity of catalysts made by incipient wetness impregnation was worse than that of catalysts made by excess-solution impregnation, examined by the T50 of 4A-IW and NaX-IW at 128 and 192 ℃, respectively.
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References
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Perez NC, Miro EE, Zamaro JM, Catal. Today, 213, 183 (2013)
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Zheng X, Wang S, Wang S, Zhang S, Huang W, Wu S, Catal. Commun., 5, 729 (2004)
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Soares JMC, Morrall P, Crossley A, Harris P, Bowker M, J. Catal., 219(1), 17 (2003)
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Erdem E, Karapinar N, Donat R, J. Colloid Interface Sci., 280(2), 309 (2004)
Hegazy EZ, Abdelmaksod IH, Kosa SA, CLEAN - Soil, Air, Water., 42, 775 (2014)
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Kim DH, Cha JE, Catal. Lett., 86(1-3), 107 (2003)
Zeng SH, Zhang WL, Sliwa M, Su HQ, Int. J. Hydrog. Energy, 38(9), 3597 (2013)
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Katta L, Sudarsanam P, Thrimurthulu G, Reddy BM, Appl. Catal. B: Environ., 101(1-2), 101 (2010)
