Abstract
The crackino of n-heptane on a HZSM-5 zeolite has been studied in a continuous qlass flow reactor, at atmospheric pressure, up to 470°C. The initial selectivities to the different reaction products, kinetic rate constants, activation energies and decay parameters have been calculated and compared with those obtained using a large pore zeolite (HYUS). A different product distribution is obtained with the two zeolites. In that way, and considering initial selectivities, different C 6/C 1, C 5/C 2, C 4/C3, i-C 4/n-C 4, ethylene/ethane, propylene/propane ratios have been found on the two zeolite catalysts. The results have been quantitatively explained by considerinq a direct cracking of heptanes as well as a condensation-cracking process of some of the products formed. From the kinetic parameters it has been seen that the HYUS is three times more active for cracking but decays some eight times faster than the HZSM-5 zeolite.
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