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Relationship between Acidity, Defective Sites, and Diffusion Properties of Nanosheet ZSM-5 and Its Catalytic Performance in the Methanol to Propylene Reaction

Xing, Aihua, Zhang, Nini, Yuan, Delin, Liu, Hua, Sang, Yu, Miao, Ping, Sun, Qi, Luo, Mingsheng
Industrial & engineering chemistry process design and development 2019 v.58 no.28 pp. 12506-12515
acidity, aluminum, catalytic activity, crystals, hot water treatment, methanol, nanosheets, process design, propylene, zeolites
A seed-induced preparation method was developed to synthesize ZSM-5 crystals, in which two different kinds of ZSM-5 crystals were used as seeds. The different preparation methods for seeds led to the difference in the morphology and Al distribution. The results showed that the synthesized zeolites showed nanosheet morphology regardless of the types of seeds. However, the different types of seed led to the difference of synthesized zeolites in the pore structure, acid properties, and defect sites. Catalytic activity for the methanol to propylene (MTP) reaction of sample synthesized from sheet-like seed was better than that synthesized from spherical seed. On the contrary, the further hydrothermal treated sample induced by spherical seed demonstrated much a longer lifetime and higher propene selectivity in the MTP reaction compared to that induced by sheet-like seed. Its excellent catalytic performance can be attributed to the proper acidity, faster diffusion rate, and fewer framework defects after hydrothermal treatment.