HYDROCRACKING OF ISOHEPTADECANES ON PT H-ZSM-22 - AN EXAMPLE OF PORE MOUTH CATALYSIS/

The isomerization hydrocracking of heptadecane on Pt/H-ZSM-22 was stud ied in a continuous flow type, fixed-bed, vapor-phase reactor. High yi elds of skeletal isomerization of heptadecane (90%) were obtained, The low tendency to cracking of isoheptadecane skeletal isomers on the ZS M-22 zeolite is explained by the limited penetration of these molecule s into the micropores openings of the zeolite, preventing their cracki ng via the common beta-scission reaction mechanisms, The reaction mech anisms of hydrocracking in pore mouths can be derived from the experim entally obtained cracking patterns. (C) 1998 Academic Press.