Comparative Study of Nano‐ZSM‐5 Catalysts Synthesized in OH− and F− Media
作者： Zhengxing Qin , Louwanda Lakiss , Lubomira Tosheva , Jean-Pierre Gilson , Aurélie Vicente
关键词: Selectivity 、 Methanol 、 Fluoride 、 Chemical engineering 、 Inorganic chemistry 、 Materials science 、 ZSM-5 、 Crystallization 、 Silanol 、 Zeolite 、 Catalysis
摘要: This study reports the seeded synthesis of MFI-type (ZSM-5) zeolite in fluoride medium at pH = 8.5. Crystal growth kinetics resulting (ZSM-5-F) as a function seed content and crystallization temperature is studied. The time reduced to 1.5 h crystals with sizes below 200 nm Si/Al ratio 23.6 are obtained. A similar characteristics but synthesized hydroxyl (ZSM-5-OH) used evaluate ZSM-5s different media. Their physicochemical properties compared particular attention paid nature, number, distribution silanol sites. two zeolites exhibit number Brφnsted acid sites; however material contains substantially larger surface internal silanols that impact significantly its catalytic performance methanol hydrocarbon transformation. While materials selectivity transformations, catalyst shows superior activity resistance deactivation. results suggest can be for preparation catalysts.
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