Abstract: Using the filtrates of zeolite and catalyst preparation process as exchanging medium, the zeolites and catalysts thereof were prepared and characterized by XRF、XRD、BET、DTA techniques. Their activity stabilities and cracking performance against conventional catalysts were tested. The result showed that the prepared catalysts have good activity stability and cracking performance; the chemical composition, crystal structure and pore structure of the zeolites are not changed by the reuse of filtrate, while the amount of fresh water and raw materials are effectively reduced, lower production cost and the environmental requirements are achieved.

Key words: filtrate, reuse, zeolite, catalyst, cracking performance