Abstract
The influence of poisoning with quinoline derivatives having various molecular dimensions on the activity of HZSM-5 zeolite for the isomerization of p-xylene was studied. Quinoline can easily enter the pores of HZSM-5 and poison the catalyst completely. On the other hand, 2,4-dimethylquinoline and β-naphthoquinoline, which are the largest molecules in the quinoline derivatives used, cannot enter the pores and selectively poison the acid sites solely on the external surface of HZSM-5 crystallites. 4-Methylquinoline, which has an intermediate size, is adsorbed on the acid sites not only on the external surface but also near the pore entrances and inhibits the diffusion of xylenes through the pore entrances. Moreover, it can diffuse into the interior of the pore at a very slow rate.
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