Authors:Dongshun Zhang, Rijie Wang, Xiaoxia Yang, and Wensheng Yao
A series of phosphorus modified Si-MCM-41 catalysts prepared via the impregnation method were used for the vapor-phase Beckmann
rearrangement of cyclohexanone oxime to caprolactam. The catalysts were characterized by XRD, N2 adsorption, FT-IR, and NH3-TPD. The results indicated that weak acid sites increased with P content, leading to enhanced catalytic activity. The catalyst
with Si/P mol ratio of 25 showed best performance at 633 K. The conversion of cyclohexanone oxime and the selectivity for
caprolactam were 92.7 and 64.2%, respectively. The P–OH groups are main active sites for the Beckmann rearrangement. Grafting
acid hydroxyl groups to cover the Si–OH groups may be a good way to improve the selectivity for this reaction.
Authors:Pingle Liu, Haike Zhang, Sihua Liu, Zhengjie Yao, Fang Hao, Kuiyi You, and He'an Luo
potassium nitrate, then it can be transformed to cyclohexanone oxime through nitrocyclohexane hydrogenation and further to ∊-caprolactam via Beckmannrearrangement, or ∊-caprolactam can be directly obtained from gas phase nitrocyclohexane hydrogenation and
applications of using sulfonic acid group functionalized Brönsted acidic ionic liquids as catalysts, which includes esterification [ 15 , 16 ], alkylation [ 17 ], nitration of aromatic compounds [ 18 ], Beckmannrearrangement [ 19 ], and alkene polymerizations
areas. They show better thermal stabilities than nitrate- or carbonate-LDHs [ 5 , 6 ] and can be used as effective catalysts in acid-catalysed reactions such as Beckmannrearrangement of cyclohexanone oxime to caprolactam and aldol condensation
Authors:Dan Liu, Jianzhou Gui, Jianfeng Ding, JuanJuan Ma, Juyoung Lee, and Zhaolin Sun
partial extracted by the ionic liquid used.
Our group synthesized several acidic ILs and applied them in Beckmannrearrangement, alkylation, esterification, polymerization reactions and so on [ 19 – 27 ]. Recently, the effect of different cations