Abstract
Abstract V 2 O 5 /SnO 2 solid acid catalysts have been employed for the vapour-phase Beckmann rearrangement of cyclohexanone oxime to ɛ-caprolactam. Catalysts with different vanadia loading (3–15 wt%) were prepared by impregnation method and characterized by XRD, BET surface area, FTIR and 51 V NMR techniques. The surface acidic properties were determined by temperature programmed desorption and cumene cracking reaction. Under optimized reaction conditions, catalyst with 9 wt% V 2 O 5 gives the maximum amount of desired product (yield 78.8%). However, the catalysts are susceptible for deactivation due to the basic nature of the reaction products (50% deactivation in 5 h). A good correlation was obtained among the rearrangement activities of V 2 O 5 /SnO 2 catalysts, their weak plus medium acidities (usually of the Bronsted type) and structural properties.
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