Preparation of microporous and mesoporous bimodel molecular sieves by heat treatment of ZSM-5

A microporous and mesoporous bimodel molecular sieve was made from commercial ZSM-5 through heat treatment routine. The structure of the bimodel molecular sieve is strongly dependent on the treatment conditions (temperature and time). The sample treated at 1000degreesC for 2h has the highest mesopore phase, and the contribution of the mesopore phase to the BET surface area is comparable to the contribution of the micropore phase. The bimodel molecular sieve has narrow mesopore pore diameter distribution and high crystallinity.