Pt/BEA–Al2O3 catalysts for the isomerization of benzene/heptane mixtures. I: Optimizing the support’s composition


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Abstract

Pt/BEA–Al2O3 catalysts for the hydroisomerization of benzene-containing gasoline fractions are studied using a model feedstock (20% benzene and 80% n-heptane). The catalysts are prepared by varying the zeolite content from 5 to 70 wt % at a constant Pt loading of 0.3 wt % in all samples, with an aqueous H2PtCl6 solution being used as the Pt precursor. The acid properties of the samples are studied by means of temperature-programmed desorption (TPD). The effect of the support’s zeolite/binder ratio on the activity of the catalysts is determined: an increase in the zeolite content raises the system’s acidity and shifts the range of the reaction toward lower temperatures. The optimum zeolite/binder ratio is found to be 30% BEA/70% Al2O3. Changing the SiO2/Al2O3 ratio of the zeolite from 25 to 40 is shown to have no noticeable effect on catalyst activity. The use of the catalysts supported on 30% BEA/70% Al2O3 in the hydroisomerization of benzenecontaining gasoline fractions can be recommended for improving environmental performance.

About the authors

E. A. Belopukhov

Institute of Hydrocarbons Processing, Siberian Branch; Omsk State Technical University

Author for correspondence.
Email: eugebel@ihcp.ru
Russian Federation, Omsk, 644040; Omsk, 644050

I. M. Kalashnikov

Institute of Hydrocarbons Processing, Siberian Branch; Omsk State Technical University

Email: eugebel@ihcp.ru
Russian Federation, Omsk, 644040; Omsk, 644050

M. D. Smolikov

Institute of Hydrocarbons Processing, Siberian Branch; Omsk State Technical University

Email: eugebel@ihcp.ru
Russian Federation, Omsk, 644040; Omsk, 644050

D. I. Kir’yanov

Institute of Hydrocarbons Processing, Siberian Branch

Email: eugebel@ihcp.ru
Russian Federation, Omsk, 644040

T. I. Gulyaeva

Institute of Hydrocarbons Processing, Siberian Branch

Email: eugebel@ihcp.ru
Russian Federation, Omsk, 644040

A. S. Belyi

Institute of Hydrocarbons Processing, Siberian Branch; Omsk State Technical University

Email: eugebel@ihcp.ru
Russian Federation, Omsk, 644040; Omsk, 644050

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