Effect of HZSM-5 zeolite addition to a fluid catalytic cracking catalyst. Study in a laboratory reactor operating under industrial conditions

The kinetic behavior has been studied for cracking a commercial feedstock o n a hybrid catalyst (with 5 wt % of HZSM-5 zeolite) made up of 80 wt % of a catalyst equilibrated in a fluid catalytic cracking (FCC) unit and of 20 w t % of a catalyst prepared based on a HZSM-5 zeolite. A laboratory-scale re actor which allows for operation under conditions similar to those of comme rcial FCC units has been used. From the analysis of the gases and gasoline obtained in the 500-550 degrees C range, with contact times between 2 and 1 0 s and for a catalyst/feedstock = 6, the influence of HZSM-5 zeolite prese nce in the catalyst on gas and gasoline composition and on gasoline researc h octane number has been analyzed.