Fig. 8

SEM images (a) zeolite ZSM-5 1st cycle (b) zeolite ZSM-5 2nd cycle, (c) zeolite ZSM-5 3rd cycle, (d) zeolite ZSM-5 4th cycle.
SEM images (a) zeolite ZSM-5 1st cycle (b) zeolite ZSM-5 2nd cycle, (c) zeolite ZSM-5 3rd cycle, (d) zeolite ZSM-5 4th cycle.