| abstract |
A cyclic method of forming crystalline ZSM-5 zeolite catalyst which comprises (a) taking a mother liquor from a previous synthesis and adding the necessary make-up materials such as an oxide of silicon, (b) maintaining the system at a temperature of from about 70 C to the boiling point of the system and at atmospheric pressure for a time sufficient to permit crystallization, (c) separating the mother liquor from the desired solid product which is also recovered, and (d) recycling the mother liquor back into step (a). |