Abstract:Abstract: A hierarchical porous HZSM-5@BMMs catalyst for the methanol to aromatics (MTA) was synthesized by epitaxial growth of the bimodal mesoporous silica shell on the core HZSM-5 zeolite. This catalyst was characterized with XRD, BET, NH3-TPD, SEM and TEM. The results indicated that HZSM-5@BMMs has the clear core-shell structure and the micro-bimodal meso porous structure, its pore size mainly distributed at 0.9, 2.2 and 5.3 nm. Compared with the HZSM-5, the specific surface area and the pore volume of HZSM-5@BMMs (510.8 m2/g, 0.399 cm3/g) are higher than those of HZSM-5 (408.4 m2/g, 0.190 cm3/g). However, the acid amount (0.573 mmol/g) of HZSM-5@BMMs is lower than HZSM-5 (amount is 0.883 mmol/g). The change of acid intensity is the same as this. The catalyst was applied in MTA, it was shown that the longevity of HZSM-5@BMMs in MTA under the same condition is 38 h longer than that of HZSM-5, and the highest yield of aromatics and the selectivity of BTX ( lightweight aromatics: benzene, toluene, xylene) on HZSM-5@BMMs were 25.7% and 55.3% respectively.