Shape-selectivity changes in high-silica zeolites

摘要: Y-type, ZSM-5 and ZSM-11 zeolites with the same chemical composition have been prepared. Peak indexation microscopic examination were used to identify phases examine samples for degree of crystallinity. The acidity was measured by temperature-programmed desorption NH3 infrared OH groups upon interaction hydrogen-bond-acceptor molecules. These data consistent results derived from total activity selectivity measurements isomerization hydrocracking n-decane on Pt-loaded zeolites.The distribution feed isomors served distinguish between HZSM-5 HZSM-11 type structures, while cracked products could be predicted using simple reaction schemes. 2,2,4-Trimethylpentane not able enter pores Pentasil zeolites, reacting near pore mouth or entering after dehydrocyclisation Pt clusters external zeolite.