Nanoscale polymer spherical and hollow structure HZSM-5 zeolites are prepared by hydrothermal and desilication–recrystallization methods. In addition, the crystallite size of two types of HZSM-5 can be easily controlled by changing H₂O/Si mole ratio. The hollow structure HZSM-5 zeolite is formed, it is due to the 010 crystal plane is the most energetically favorable orientation in silicalite-1 and the Si species is first removed on this crystal plane. The properties of different morphology zeolites were characterized by means of XRD, SEM, TEM, NH₃-TPD, N₂ isothermal adsorption–desorption and TG, and the catalytic performance of these two types of HZSM-5 in MTA reaction was investigated in a fixed-bed differential reactor. The results showed that the multilevel pore structure and suitable acid strength and more acid density were obtained in the hollow structure HZSM-5 zeolite. Therefore, the hollow HZSM-5 zeolite exhibited that higher catalytic lifetime and selectivity of aromatics than nanoscale polymer spherical HZSM-5 zeolite in MTA reaction. Furthermore, the Al distribution on the 010 crystal plane may change slightly during the process of fabricating hollow mesoporous, which leads to higher selectivity of p-xylene over hollow HZSM-5 than nanoscale polymer spherical HZSM-5 zeolite.

采用水热法和脱硅-重结晶法制备纳米级聚合物球形和中空结构HZSM-5沸石。此外，通过改变H ₂ O/Si 摩尔比，可以轻松控制两种HZSM-5 的微晶尺寸。形成中空结构的HZSM-5沸石，这是由于010晶面是硅沸石-1中能量最有利的取向，并且首先在该晶面上去除了Si物种。通过XRD、SEM、TEM、NH ₃ -TPD、N _{2 等}手段对不同形貌沸石的性质进行了表征在固定床差动反应器中研究了等温吸附-解吸和TG，以及这两种HZSM-5在MTA反应中的催化性能。结果表明，中空结构的HZSM-5沸石获得了多级孔结构和适宜的酸强度和更高的酸密度。因此，空心 HZSM-5 沸石在 MTA 反应中表现出比纳米级聚合物球形 HZSM-5 沸石更高的催化寿命和芳烃选择性。此外，在制备中空介孔的过程中，010晶面上的Al分布可能会略有变化，这导致对二甲苯在中空HZSM-5上的选择性高于纳米级聚合物球形HZSM-5沸石。