Abstract:

The micro-mesoporous composite molecular sieves of ZSM-5/SBA-15 composite sieves were prepared by post-synthesis method and characterized by XRD and N2 adsorption-desorption. The results indicated that ZSM-5/SBA-15 has both ZSM-5 microporous and SBA-15 mesoporous structure. The ZSM-5/SBA-15 composite molecular sieves used in toluene alkylation reaction of methanol, As the reaction conditions of 120 ℃, WHSV of 2 h-1, the Toluene Methanol mole ratio of 2, Toluene conversion rate was 17.35%, the selectivity and the yield of the p-xylene is 62.78% and 10.89%,respectively.

Key words: ZSM-5/SBA-15, alkylation, p-xylene, reaction condition