The influence of gal lium on the properties of Pt-Re/Al2O3 catalysts used in naphtha reforming was studied. The catalysts were prepared by the coimpregnation method. It was found that the addition of gallium to the Pt-Re/Al2O3 catalyst diminishes its acidity (Bronsted and Lewis). It also produces an inhibition of the metal function, i.e. dehydrogenation and hydrogenolysis activity. Activity tests for n-C-5 isomerization showed that gallium addition decreases the total activity of the Pt-Re catalyst but increases its selectivity to i-C-5 isomers. The selectivity to low value light gases (C-1-C-3) is particularly decreased. Catalytic tests for n-C-7 reforming showed that addition of gallium increases both catalyst stability and selectivity to aromatics, and decreases the production of light gases. (C) 2011 Elsevier B.V. All rights reserved.