Catalysis of the formation of ∈-caprolactam from cyclohexanone oxime by tungsten oxide solid acids

摘要

The synthesis and characterization of a new solid acid, tungsten oxide/silica gel, is described and different procedures for its preparation compared. Characterization includes the combined calorimetric and adsorption isotherm analysis, cal-ad, providing equilibrium constants, enthalpies and amounts of the different acid sites on the solid. The solid acid is shown to catalyze the Beckmann rearrangement of cyclohexanone oxime to ∈-caprolactam. Competing pathways that depend on strength and the indus- Trial significance of this intermediate for Nylon 6, make this an ideal reaction to show the relationship between acid catalysis and Solid acidity.