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Received April 13, 2009
Accepted August 4, 2009
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Alkaline earth metal oxides on γ-Al2O3 supported Co catalyst and their application to mercaptan oxidation
School of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran
parvari@iust.ac.ir
Korean Journal of Chemical Engineering, February 2010, 27(2), 422-430(9), 10.1007/s11814-010-0071-4
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Abstract
γ-Al2O3-supported alkaline earth metal oxide samples with different MgO, CaO, SrO and BaO loadings have been prepared by impregnating γ-Al2O3 with alkaline earth metal nitrate solutions and then calcining at 773 K and 1,023 K. The resultant samples have been characterized by XRD, EDS coupled with SEM, CO2-TPD and BET. After preparation of the γ-Al2O3-supported alkaline earth metal oxide samples and impregnation with the liquid catalyst LCPs30, supplied by Axens, the catalytic performance of these catalysts was evaluated in the mercaptan oxidation reaction._x000D_
Results showed that magnesium base oxide is formed at 773 K and base oxides of calcium, barium and strontium are formed at 1,023 K. Catalysts with higher mole ratios have higher conversions and the basicity increases with increasing base oxide loading in the samples. Furthermore, the conversion of mercaptans increases with increasing atomic number of the alkaline earth metal, excluding MgO, which has the highest conversion compared to the other base oxides.
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Jiang DE, Zhao BY, Xie YC, Pan GC, Ran GP, Min EZ, Appl. Catal. A: Gen., 219(1-2), 69 (2001)
Leitao A, Rodrigues A, Chem. Eng. Sci., 44, 1245 (1989)
Mei H, Hu M, Ma HX, Yao HQ, Shen J, Fuel Process. Technol., 88(4), 343 (2007)
Alcaraz JJ, Arena BJ, Gillespie RD, Holmgren JS, Catal. Today, 43(1-2), 89 (1998)
Jiang DE, Pan GC, Zhao BY, Ran GP, Xie YC, Min E, Appl. Catal. A: Gen., 201(2), 169 (2000)
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