The influence of alumina used as a support on the catalytic properties of Pt/Sn/Al2O3 systems in the dehydrogenation of isobutane

Subject Areas : Journal of the Iranian Chemical Research

Sedigheh Vaezifar ¹ , hossein Faghihian ² , Mehdi kamali ³

1 - Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran Fadak Chemical Company, Isfahan Science and Technology Town (ISTT), Isfahan, Iran
2 - Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
3 - Central Laboratory, Faculty of Modern Sciences & Technologies, University of Isfahan, Isfahan 81746-73441, Iran

Received: 2008-05-31 Accepted : 2008-09-13 Published : 2008-10-31

Keywords: Bimetallic catalysts preparation, Supported platinum–tin catalysts, Dehydrogenation, Isobutene,

Abstract :

In this research different types of Al2O3 were used as supports to prepare catalysts for dehydrogenation of isobutane to isobutene. These supports were Al2O3 from Merck, Axen and gamma Al2O3 synthesized from Al(OH)3. Sn/Pt/Al2O3 catalysts were prepared by sequential impregnation, at first Pt and then Sn was deposited. Characterization of catalysts was performed by X-ray powder diffraction (XRD) and thermal analysis (TG/DTG) techniques. Elemental analysis of the catalysts was also carried out by wet chemical analysis using inductively coupled plasma (ICP) technique. Isobutane dehydrogenation was studied in a reactor under atmospheric pressure at 848 K. The conversion, selectivity and yield of the prepared catalysts were calculated.

References:

[1] E.O. Box, L.E. Drehman, F. Farha, German Patent, No. 2 127 353, 1970.
[2] M.E. Olbrich, D.L. McKay, D.P. Montgomery, US Patent, No. 4 926 005, 1989.
[3] F. Wilhelm, Dutch Patent, No. 2 164 295, 1972.
[4] F.C. Wihelm, U.S. Patent, No. 3 755 480, 1973.
[5] D.E. Resasco, G.L. Haller, Catalysis 11 (1994) 379.
[6] T. Hutson Jr, W.C. McCarthy, Handbook of Petroleum Refining Processes, McGraw-Hill, London, 1986.
[7] P.R. Pujado, B.V. Vora, Hydrocarbon Process, 1990.
[8] G.F. Hornaday, F.M. Ferrell, G.A. Mills, Adv. Petrol. Chem. Refining 4 (1961) 451.
[9] J. Llorca, N. Homs, Applied Catalysis A: General 189 (1999) 77.
[10] F. Humblot, J.P. Candy, F. Le Peltier, B. Didillon, J.M. Basset, J. Catalysis 179 (1998) 459.
[11] F.Z. Bentahar, J.P. Canday, Catalysis Today 66 (2000) 303.
[12] F. Pinna, Catalysis Today, 41 (1998) 129.
[13] M.A. Centeno, M. Debois, P. Grange, J. Catalysis 192 (2000) 296.