Abstract
Thermally treated H-ZSM-5 samples were investigated as catalysts of toluene disproportionation and xylene isomerization and they were characterized by i.r. and TPD techniques. Thermal pretreatment enhanced selectivity of p-xylene formation and decreased activity. These effects can be partially reversed by subsequent treatment of the sample with HCl. It is suggested that extra lattice aluminium, originating from thermal dealumination, forms diffusion barriers in the pores, which are responsible for the catalytic effects and that HCl treatment partially dissolves these barriers.
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