Abstract Two series of catalyst were synthesized by the modified fast synthesis method and characterized by XRD, nitrogen physisorption, FT-IR, 27Al MAS NMR, and NH3-TPD. The catalysts were used for vapor phase Beckmann rearrangement of cyclohexanone oxime. The XRD results indicate that the synthesized catalysts exhibit the typical mesostructural of MCM-41. The FT-IR results conforme that aluminium(Al) and boron(B) atoms are coordinated in the framework of zeolite. When the mole ratio of Al/B equals 0.5, with increasing the amount of Al and B content, more weak acid sites are produced. And more weak acid sites are favorable to form caprolactam. When the mole ratio of Si/M equals 10, the selectivity of caprolactam increased with increasing B content. The catalyst has low activity by adding B only in the MCM-41. The activity of (Al, B)-MCM-41 is mainly associated with weak acid site.
WANG Li-Jun, WANG Ri-Jie, YANG Xiao-Xia, ZHANG Dong-Shun.Application of Vapor Phase Beckmann Rearrangement of Cyclohexanone Oxime over (Al, B)MCM41 Zeolite[J] Chemcial Industry and Engineering, 2012,V29(4): 26-32
2012, Vol. 29 
