Vapor-Phase Beckmann Rearrangement of Cyclohexanone Oxime over an HY Zeolite Catalyst Calcined at High Temperature

• Published in: Bulletin of the Chemical Society of Japan Vol. 65; no. 6; pp. 1486 - 1490
• Main Authors: Sato, Satoshi, Takematsu, Kiyotaka, Sodesawa, Toshiaki, Nozaki, Fumio
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.06.1992; Chemical Society of Japan
• Subjects: Catalysis; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Beckmann rearrangement; High temperature; Gas phase; Zeolite; Catalyst activity; X ray diffraction; Physical properties; Calcining
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.65.1486

The vapor-phase Beckmann rearrangement of cyclohexanone oxime over an HY zeolite calcined at high temperatures was investigated. Cyclohexanone oxime was rearranged into ε-caprolactam with high conversion at 573 K over an HY zeolite calcined at 873 K. The activity decay was slight, while oxime conversion over an HY zeolite calcined at 773 K steeply decreased during the initial stage of the reaction. The catalytic activity for the rearrangement was not correlated with the physical properties of a fresh catalyst, but with those of a used one, especially regarding their porosity and acidity. It was also found that the produced ε-caprolactam was tightly adsorbed on strong aicd sites, filling the micropores of the zeolite during the initial stages of the reaction, and that a large portion of the catalytic reaction proceeded mainly on weak acid sites located in a region near to the external surface of the zeolite.