Abstract
The morphology of ZSM-5 zeolite impacts the adsorption, separation and diffusion of molecules. The morphology and textural properties of ZSM-5 zeolites were adjusted by regulating the content of ethanol in the synthesis gel. When the ratio of ethanol/SiO2 was lower than 2, the obtained crystals were isolated particles. With higher ethanol concentration, the chainlike zeolite was generated due to the condensation of terminal Si-OH groups. The crystals stacked more and more compactly with the increase in ethanol concentration, resulting in decreased specific surface area, total volume and mesoporous volume. The crystal size increased gradually with the increase in the ethanol concentration. Moreover, some other small molecular alcohols could also induce the formation of chainlike morphology of ZSM-5.
Highlights
ZSM-5 zeolite shows a high thermal stability, anti-coke ability and excellent shape selectivity due to its acid property, exceptional skeleton and channel structure
The MFI zeolite with ultrathin nanosheet morphology showed a higher BET surface area and pore volume, which facilitated the transport of reactants, resulting in higher activity comparing with the conventional ZSM-5 zeolite [15,16,17]
With the synthesized after evaporating ethanol for different are shown in Figure the increase of increase of time, evaporation time,content the ethanol in the liquid
Summary
ZSM-5 zeolite shows a high thermal stability, anti-coke ability and excellent shape selectivity due to its acid property, exceptional skeleton and channel structure. Tago et al [12,13] studied the influence of crystal size on the catalytic performance of ZSM-5 on n-hexane cracking They found the reaction rate could be enhanced significantly by nanosizing zeolite. The self-stacked MFI zeolite prepared with the assistance of cationic polymers showed high activity in 1,3,5-triisopropylbenzene cracking and methanol-to-olefins reaction [19]. During the preparation of ZSM-5 zeolite, it takes some time to nucleate and intercrystal mesopore was synthesized, while at a higher temperature, cuplike ZSM-5 nanocrystals grow. MFI zeolite was prepared with power induced the condensation of hydroxyl groups and formed stacked crystals [29]. It is meaningful and important developina the facile synthetic strategy to control the polymer may reduce the interface surface tension,toresulting stacking of crystals. The relationship between morphology and textual properties was studied in detail
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