A nanosized aluminoborate (PKU-5) with Cr-centered octahedral framework: Solid-phase synthesis, characterizations and catalytic ammoximation of cyclohexanone to cyclohexanone azine

作者：Zhang, Fenhua; Wang, Weilu; Hu, Shixiang; Ma, Xiaotong; Gao, Wenliang^*; Cong, Rihong; Yang, Tao^*

来源：Applied Catalysis A: General , 2017, 531: 60-68.

DOI：10.1016/j.apcata.2016.12.007

• Aluminoborates
• Redox molecular sieves
• Isomorphous substitution
• Ketone ammoximation
• Reaction mechanism

Octahedron-based redox molecular sieves Cr-PKU-5 were synthesized by a two-step template annealing method and used as catalysts for the liquid-phase ammoximation of cyclohexanone. PKU-5 (Al4B6O15) is a novel anhydrous aluminoborate, but difficult to be synthesized due to the severe demands of preparation procedures. Interestingly, Cr-stabilized PKU-5 can be facilely prepared with nano-scaled distribution and large BET surface area by annealing Cr-doped PICU-1 precursors at high temperature. Le Bail fitting of powder XRD patterns demonstrated large amounts of Cr3+ has been incorporated into the framework of PKU-5. Much different with TS-1 redox molecular sieve, Cr-PKU-5 was favorable to produce ketazine in the liquid-phase ammoximation of ketone, rather than oxime. Based on the discussion about reaction pathway, a probable reaction mechanism was proposed to interpret the critical role of Cr-PKU-5 in such a complex multi-step reaction.

• 出版日期2017-2-5
• 单位重庆大学