CATALYTIC CRACKING OF A BINARY MIXTURE ON ZEOLITE CATALYSTS

The catalytic cracking of 1-methylnaphthalene individually and in bina ry combination with n-hexadecane on zeolite catalysts is reported. It is shown that for cracking of the polyaromatic feed over HY zeolite, t he major processes are isomerisation and disproportionation. In the bi nary mixture, product selectivity is unchanged when compared to cracki ng of the individual components. The relative reactivity of the linear alkane in the presence of the alkyldiaromatic is significantly reduce d, and may be attributed to blockage of either zeolite pores or acid s ites on the zeolite surface. For cracking of the binary mixture over a combination of HY and HZSM-5 zeolites, shifts in product selectivity when compared to those for cracking over the faujasite catalyst alone, suggest that the pentasil additive acts to suppress bimolecular hydro gen transfer processes on HY zeolite.