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Abstract  

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.

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intermediates for the production of nylon-6 fibers, plastics and resins. The current commercial productions of cyclohexanone oxime and ∊-caprolactam are mainly based on the traditional route that cyclohexane is oxidized to cyclohexanone through a very low

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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 Beckmann rearrangement of cyclohexanone oxime to caprolactam and aldol condensation

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, Yokoyama , C , Sato , H , Yamashina , M . Preparation of ∊-caprolactam via Beckmann rearrangement of cyclohexanone oxime: a mild and recyclable process . Chem Lett 2004 33 : 1350 – 1354 10.1246/cl.2004.1350 . 20

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Journal of Thermal Analysis and Calorimetry
Authors: Luiz K. C. de Souza, Juliana J. R. Pardauil, José R. Zamian, Geraldo N. da Rocha Filho, and Carlos E. F. da Costa

.1016/j.apcata.2005.12.013 . 11. Anilkumar , M , Hölderich , WF . Highly active and selective Nb modified MCM-41 catalysts for Beckmann rearrangement of cyclohexanone oxime to epsilon

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the reaction mixture was determined by its reaction with cyclohexanone to give cyclohexanone oxime [ 21 ]. The actual procedure is as follows. When the amination reaction was stopped, the reaction mixture was cooled to 65 °C and 20 mmol cyclohexanone

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