Abstract: ZSM-5 zeolite was synthesized by the relay-oriented method of crystal seed and organic template agent, and the obtained ZSM-5 zeolite has similar crystalline structure, morphology, bulk Si/Al ratio, and pore structure to those of ZSM-5 zeolite synthesized by traditional methods. The performance of ZSM-5 zeolite synthesized by the relay method and traditional methods was compared on the reaction with 1,3,5-triisopropylbenzene catalytic cracking as probe. The results showed that the conversion of 1,3,5-triisopropylbenzene of ZSM-5 zeolite prepared by the relay method was low, which indicated that the surface of ZSM-5 zeolite prepared by the this method was rich in silicon and poor in aluminum. Furthermore, the zeolites synthesized by both methods were used as isomerization catalysts for ethylbenzene isomerization. Under the same reaction conditions, the ethylbenzene conversion of ZSM-5 zeolite prepared by the relay method was higher, but the isomerization activity and xylene loss rate were lower. It can be seen that crystal seed and organic template agent relaying is a feasible method to prepare core-shell molecular sieve with different aluminum content.

Key words: molecular sieve, ethylbenzene, deethylation, xylene isomerization, seed, organic template agent