The commercially important polymer Nylon 6 is manufactured by ring-opening polymerization of eta-caprolactam. Industrially, eta-caprolactam is conventionally made by the Beckmann rearrangement of cyclohexanone oxime, a stoichiometric process that generates large quantities of undesirable by-products. Recent work at Southampton has shown that a hierarchically porous silicoaluminophosphate; HP-SAPO-37, is able to achieve near-quantitative yields of eta-caprolactam at temperatures as low as 130 °C. The interaction of the oxime with acidic silanols and Brønsted acid sites is crucial to the mechanism but this is not well-understood. The aim of this proposal is to investigate a series of catalysts with different types of acidity in order to characterise how the interaction of cyclohexanone oxime varies with the different acid groups and hence provide insight into the reaction mechanism.