Abstract
The acidic and hydrogenating of Pt/SO 2−4 -ZrO2-Al2O3 samples containing from 18.8 to 67.8 wt % Al2O3 as a support constituent were studied by the IR spectroscopy of adsorbed CO and pyridine, and the model reactions of n-heptane and cyclohexane isomerization on these catalysts were examined. The total catalyst activity in the conversion of n-heptane decreased with the concentration of Al2O3; this manifested itself in an increase in the temperature of 50% n-heptane conversion from 112 to 266°C and in an increase in the selectivity of isomerization to 94.2%. In this case, the maximum yield of isoheptanes was 47.1 wt %, which was reached on a sample whose support contained 67.8 wt % Al2O3. A maximum yield (69.6 wt %) and selectivity (93.7%) for methylcyclopentane formation from cyclohexane were also reached on the above catalyst sample. This can be explained by lower concentrations of Lewis and Brønsted acid sites in the Pt/SO 2−4 -ZrO2-Al2O3 system, as compared with those in Pt/SO 2−4 -ZrO2. The experimental results allowed us to make a preliminary conclusion that the Pt/SO 2−4 -ZrO2-Al2O3 catalyst whose support contains 67.8 wt % Al2O3 is promising for use in the selective hydroisomerization of benzene-containing gasoline fractions in the thermodynamically favorable process temperature range of 250–300°C.
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Benitez, V.M., Grau, J.M., Yori, J.C., Pieck, C.L., and Vera, C.R., Energy Fuels, 2006, vol. 20, p. 1791.
Miyaji, A. and Okuhara, T., Catal. Today, 2003, vol. 81, p. 43.
Kazakov, M.O., Lavrenov, A.V., Mikhailova, M.S., Allert, N.A., Gulyaeva, T.I., Muromtsev, I.V., Drozdov, V.A., and Duplyakin, V.K., Kinet. Katal., 2010, vol. 51, no. 3, p. 457 [Kinet. Catal. (Engl. Transl.), vol. 51, no. 3, p. 438].
Moreno, S., Sun Kou, R., and Poncelet, G., J. Catal., 1996, vol. 162, p. 198.
Molina, M.F., Molina, R., and Moreno, S., Catal. Today, 2005, vol. 107–108, p. 426.
Wakayama, T. and Matsuhashi, H., J. Mol. Catal. A: Chem., 2005, vol. 239, p. 32.
Ginzburg, S.I., Gladyshevskaya, K.A., Ezerskaya, N.A., et al., Rukovodstvo po khimicheskomu analizu platinovykh metallov i zolota (Handbook for the Chemical Analysis of the Platinum Metals and Gold), Moscow: Nauka, 1965.
Paukshtis, E.A. and Yurchenko, E.N., Usp. Khim., 1983, vol. 52, no. 3, p. 426.
Paukshtis, E.A., Infrakrasnaya spektroskopiya v geterogennom kislotno-osnovnom katalize (Infrared Spectroscopy in Heterogeneous Acid-Base Catalysis), Novosibirsk: Nauka, 1992.
Zhorov, Yu.M., Termodinamika khimicheskikh protsessov (Chemical Thermodynamics), Moscow: Khimiya, 1985.
Hughes, T.R. and White, H.M., J. Phys. Chem., 1967, vol. 71, p. 2192.
Segawa, K. and Hall, W.K., J. Catal., 1982, vol. 76, p. 133.
Datka, J., Turek, A.M., Jehng, J.M., and Wachs, I.E., J. Catal., 1992, vol. 135, p. 186.
Zalewski, D.J., Alerasool, S., and Doolin, P.K., Catal. Today, 1999, vol. 53, p. 419.
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Original Russian Text © M.O. Kazakov, A.V. Lavrenov, I.G. Danilova, O.B. Belskaya, V.K. Duplyakin, 2011, published in Kinetika i Kataliz, 2011, Vol. 52, No. 4, pp. 583–588.
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Kazakov, M.O., Lavrenov, A.V., Danilova, I.G. et al. Hydroisomerization of benzene-containing gasoline fractions on a Pt/SO 2−4 -ZrO2-Al2O3 catalyst: II. Effect of chemical composition on acidic and hydrogenating and the occurrence of model isomerization reactions. Kinet Catal 52, 573–578 (2011). https://doi.org/10.1134/S0023158411040057
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DOI: https://doi.org/10.1134/S0023158411040057