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• W2023843964 abstract "The Beckmann rearrangement of cyclohexanone oxime (CHO) to ϵ-caprolactam (ϵ-C) was studied in a plug flow reactor at 300–400°C under atmospheric pressure by using Hβ, ZSM-5, and alumina pillared montmorillonite. With Hβ(X) Y zeolites, raising the SiO2/Al2O3 molar ratio (X) results in the enhancement of catalyst acid strength with concomitant decrease of the total acid amount. In creasing the calcination temperature (Y) causes remarkable diminution of catalyst surface area, acid strength, and acid amount. A similar trend was found for AlPMY catalysts. In there action of CHO, the initial catalytic activity correlates well with the total acid amount of various catalysts except for Hβ(10) Y (Y > 600°C). The reaction proceeds on both Brönsted and Lewis acid sites and the catalyst deactivation most likely occurs at the strong Brönsted acid sites. The effect of solvents in the feed on the catalytic results was also investigated; it was found that polar solvents such as ethanol or n-butanol give high ϵ-C yield and longer catalyst life time. In the reaction of CHO/C2H5OH over Hβ(10)800 at 400°C and W/F 74.6 gh/mol, the CHO conversion and ϵ-C yield remain 100% and 92%, respectively, for at least 20 h time-on-stream. The reaction paths and the mechanism for ϵ-C formation are proposed." @default.
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• W2023843964 date "2001-04-01" @default.
• W2023843964 modified "2023-10-16" @default.
• W2023843964 title "Synthesis of ϵ-Caprolactam from Cyclohexanone Oxime Using Zeolites Hβ, HZSM-5, and Alumina Pillared Montmorillonite" @default.
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• W2023843964 doi "https://doi.org/10.1002/jccs.200100025" @default.
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