Lacarriere et al. (2011)conducted a study with two different zeolites (i.e. H-MCM-22 and HMCM-36) at 450
C and 2 h
1
. The H-MCM-22 catalyst that was
three times denser in the concentrations of acid sites was more
favorable to aromatization and hydride transfer reactions. It was
25% selective to the formation of gasoline range hydrocarbons
compared to 12% for the H-MCM-36 catalyst (seeFig. 8). However,
its textural features enhanced catalyst deactivation due to higher
susceptibility to the formation of coke precursors. On the other
hand, H-MCM-36 produced mainly aliphatic hydrocarbons to 85%
selectivity, with high degree of resistance to coking. It was established that, the combined meso- and micro-porosity characteristics
of this catalyst enhanced non-restricted diffusion of bulkier reaction products, with potentials as coke precursors. Therefore,
appropriate balance between acidity and textural properties is
necessary to achieve desired selectivity to the targeted hydrocarbon products.