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Received January 10, 2011
Accepted February 15, 2011
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Total oxidation of propane over Cu-Mn mixed oxide catalysts prepared by co-precipitation method
Department of Environmental Engineering, Daegu University, Gyeongsan 712-714, Korea 1Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea 2Department of Chemical Engineering, Kyungil University, Gyeongsan 712-701, Korea
swham@kiu.ac.kr
Korean Journal of Chemical Engineering, April 2011, 28(4), 1139-1143(5), 10.1007/s11814-011-0035-3
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Abstract
The catalytic activity of Cu-Mn mixed oxides with varying Cu/Mn ratios prepared by co-precipitation method was examined for the total oxidation of propane. The nature and phase of the metal oxide species formed were characterized by various methods such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (TPR) as well as BET surface area measurement. The co-precipitation method provides highly interdispersed copper and manganese metallic elements forming Cu-Mn mixed oxide of spinel structure (Cu1.5 Mn1.5O4). Besides the spinel-type Cu-Mn mixed oxide, CuO or Mn2O3 phases could be formed depending on the Cu/Mn molar ratio of their precursors. The catalytic activity of Cu-Mn mixed oxide catalyst for propane oxidation was much higher than those of single metal oxides of CuO and Mn2O3. The higher catalytic activity likely originates from a synergic effect of spinel-type Cu-Mn mixed oxide and CuO. The easier reducibility and BET surface area seems to be partially responsible for the high activity of Cu-Mn mixed oxide for total oxidation of propane.
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Wollner A, Lange F, Schmelz H, Knozinger H, Appl. Catal. A: Gen., 94, 181 (1993)
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Sinha APB, Sanjana NR, Biswas AB, J. Phys. Chem., 62, 191 (1958)
Miahara S, J. Phys. Soc. Jpn., 17B-I, 181 (1962)
Lasse GB, J. Phys. Chem. Solids., 27, 383 (1966)
Veprek S, Cocke DL, Kehl S, Oswald HR, J. Catal., 100, 250 (1986)
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