TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The catalyst is pretreated at 200-650 degrees C, preferably 300-600 degrees C for 2 hours under the continuous flow of a carrier gas (preferably air or nitrogen). Preferred Components: The MFI type zeolitic catalyst is in the form of dust, pellet or any other configuration. The MFI type catalyst is a zeolite sieve of molecular porosity-5 (ZSM-5) zeolite.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The results obtained in the effluent with a composition for: total olefins (ethene+propene+butenes) is 2-50 (preferably 6-20) wt.%; for the LPG fraction is 5-70 (preferably 9-40) wt.%; and for the aromatic fraction is 1-50 (preferably 1-30) wt.%. The composition of toluene falls is 33-44 wt.% of the total aromatic fraction composition. The results of selectivity for: total olefins (ethene+propene+butenes) is 10-80 (preferably 17-65) wt.%; for the LPG fraction is 5-50 (preferably 15-35) wt.%; and for the aromatics is 1-70 (preferably 5-45) wt.%. The MFI type zeolitic catalyst in acid form has a grain size distribution of 0.247-0.091 mm. EXAMPLE - Catalyst with a grain size distribution of 0.247-0.091 mm was pre-macerated and sifted. The catalyst was pretreated at 530 degrees C for 2 hours with a heating rate of 5 degrees C/minute under a continuous flow at 40 ml/minute, preferably with synthetic air. The load of natural condensed gas was maintained with a continuous stream at 0.599 ml/minute on a catalyst mass of 0.2626 g for 24 hours. The performance of the catalyst was evaluated for the reaction times corresponding to 2, 12, and 24 hours and the selectivity values (in wt.%) for the reaction were calculated and the results showed as: total olefins (59.1), liquefied petroleum gas (LPG) fraction (27.2) and total aromatics (5.2) for 2 hours; total olefins (59.5), LPG fraction (23.2) and total aromatics (9.5) for 12 hours; total olefins (63.1), LPG fraction (21.5) and total aromatics (7.6) for 24 hours.