Highly selective synthesis of 2,6-dimethylnaphthalene over alkaline treated ZSM-12 zeolite

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• 作者：Cheng Li^a ; Lingfei Li^b ; Wei Wu^a ;   ; ^{wuwei@hlju.edu.cn} ; Dongsheng Wang^a ; A.V. Toktarev^c ; O.V. Kikhtyanin^c ; G.V. Echevskii^c
• 关键词：ZSM-12 zeolite ; 2 ; 6-dimethylnaphthalene ; Desilication ; Alkylation
• 刊名：Procedia Engineering
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：18
• 期：Complete
• 页码：200-205
• 全文大小：378 K

文摘

ZSM-12 zeolites synthesized by using different templates were modified by desilication treatment in alkaline medium. The samples before and after alkaline treatment were characterized by X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), N₂ physical adsorption, solid state NMR (²⁹Si MAS NMR), ammonia temperature programmed desorption (NH₃-TPD) and FT-IR spectroscopy of adsorbed pyridine (Py-IR). The effects of desilication on the structure, acidity and catalytic performance in the alkylation of naphthalene with methanol over ZSM-12 zeolites were investigated. The results showed that acidity of ZSM-12 zeolites could be adjusted and mesopores were generated after alkaline treatment, so catalytic performance was effectively improved, and increase of naphthalene conversion, selectivity to 2,6-DMN and 2,6-/2,7-DMN ratio were observed over the alkaline treated samples.