ZSM-5 catalytic cracking processs using large size ZSM-5 crystals

摘要

Octane improvement in catalytic cracking of petroleum fractions is obtained by adding to conventional cracking catalysts small amounts of an additive comprising zeolites having a silica to alumina mole ratio greater than 12, a constraint index of 1 to 12, and crystal size of between 0.2 to 10 microns.