Abstract
A vapor phase Beckmann rearrangement of cyclohexanone oxime to τ-caprolactam over a high silicious ZSM-5 (Si/Al ≧ 1, 000) was studied in detail in relation to the hydrothermal synthesis of ZSM-5 and to its surface silanol groups. Two important factors were found to enhance the lactam selectivity; external surface area (ESA) and modification of the surface silanols with trimethylchlorosilane (TMCS). Thus the excellent results (oxime conversion=100%, lactam selectivity=95%) were obtained over the high silicious (Si/Al≧1,000) and high ESA (≧10m2/g) ZSM-5 which was further modified with TMCS (ref.1).
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