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Preparation of p-Aminophenol from Phenyl-Hydroxylamine Catalyzed by ZSM-5 Zeolites
Li Wenqiang,Chen Zixuan,Ding Xiaoguang,An Huiyong,Yu Fang
Abstract647)      PDF (2764KB)(386)      

Na-ZSM-5 was prepared by in-situ hydrothermal process. H-ZSM-5 (n(Si)/n(Al)=40) molecular sieves were prepared by ion exchange. p-Aminophenol was prepared by Bamberger rearrangement catalyzed by the molecular sieves using phenyl-hydroxylamine as raw material. XRD, FT-IR, N2 adsorption-desorption, SEM and Py-FTIR techniques were used to study the topological structure, micropore pore size and acidity of Na-ZSM-5 and H-ZSM-5 molecular sieves. The results showed that the prepared molecular sieves had MFI microporous structures with well crystallinity. Py-FTIR technique showed that Na-ZSM-5 had almost no B acid. H-ZSM-5(40) molecular sieve had weaker B acid and L acid. Catalysis performance showed that phenyl-hydroxylamine conversion was low in the presence of ZSM-5 with weaker acidity as catalyst. However, because of its moderate pore size, p-aminophenol selectivity and yield reached as high as 72.48% and 58.75%, respectively. The optimal conditions of p-aminophenol preparation from phenyl-hydroxylamine Bamberger rearrangement were as follows: mass ratio 1∶3 of phenyl-hydroxylamine to H-ZSM-5(40) molecular sieve, optimal reaction temperature of 353 K, optimal reaction time of 2 h, and water as solvent. Phenyl-hydroxylamine conversion and p-aminophenol selectivity were as high as 86.35% and 78.33%, respectively.

2018, 31 (02): 20-26. DOI: 10.3969/j.issn.1006-396X.2018.02.004