Vapor phase reaction of cyclohexanone oxime over boria modified HSZM‐5 zeolites

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Abstract
The vapor phase Beckmann rearrangement of cyclohexanone oxime has been carried out over zeolites and boria modified HZSM‐5 zeolites to elucidate the effects of acidity and acid strength distribution on the conversion and ε‐caprolactam selectivity. Although ε‐caprolactam selectivity was increased with the SiO2Al2O3 ratio in a HZSM‐5 zeolite, the highest selectivity in the study was accomplished over a boria modified HZSM‐5. The selectivity was dependent on the ratio of weak acid sites to strong acid sites. The boria played an important role in controlling the acid strength distribution of the zeolites.It was found that the production of a polymer over strong acid sites caused a decrease in ε‐caprolactam selectivity during the reaction.