he process for preparing a high-octane gasoline involves catalyzing a light hydrocarbon containing one or more C 2 -C 7 paraffins and/or C 2 -C 7 olefins with a crystalline aluminogallosilicate with the skeleton comprised of SiO 4 , AlO 4 and GaO 4 tetrahedra at temperatures ranging from 350°C to 650°C under a hydrogen partial pressure of not higher than 5 kg/cm 2 . The crystalline aluminogallosilicate to be used as the catalyst for the process has its skeleton comprised of SiO 4 , AlO 4 and Ga0 4 tetrahedra and having the following formula:
wherein M is a metal selected from an alkaline metal, and alkaline earth metal and a mixture thereof, n is the valence of said metal, a is a positive number of (b + 1) ± 3.0, b is between 0.3 and 30, c is between 8 and 2,000, and d is between 1 and 200.