| Abstract
| - The influence of the solvent (water, acetone, and ethanol) used during alumina impregnationon the properties of Pt/Al2O3 and Pt−Sn/Al2O3 catalysts was studied. Catalysts were characterizedby H2 chemisorption, TEM, temperature-programmed reduction, ammonia temperature-programmed desorption, UV−vis spectroscopy and cyclohexane dehydrogenation, n-pentaneisomerization, and n-octane reforming reactions. It was found that the catalysts prepared inethanol has the highest metallic dispersion. The results are explained considering the Pt−Sncomplex stability in the different solvents used during the preparation. Pt/Al2O3 (acetone) isthe most active catalyst for isomerization while the activity of Pt−Sn/Al2O3 catalysts decreasesin the order ethanol > acetone > water. The selectivity to aromatic hydrocarbons is related toisomerization activity, but there also exits a competition between hydrocracking and dehydrocyclization.
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