Fernanda Parra da Silva , Renato V. Gonçalves , Liane M. Rossi
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引用次数: 23
摘要
以分子氧为唯一氧化剂制备的磁可回收氧化铜催化剂具有良好的烯丙基氧化环己烯的性能。在磁性回收载体上固定化预先合成的聚乙烯醇稳定Cu2O纳米颗粒制备催化剂;催化剂经600℃煅烧后进一步氧化为CuO NPs。两种催化剂均可选择性地通过烯丙基氧化生成主要产物2-环己烯-1- 1,但在100℃、4 bar O2压力下反应6 h, CuO为最活跃的物质,环己烯转化率为90%,烯丙基产物选择性为96%。催化剂在没有金属浸出的情况下被磁性回收,并且至少可以连续六次重复使用。
Magnetically recoverable copper oxide catalysts for aerobic allylic oxidation of cyclohexene
Magnetically recoverable copper oxide catalysts prepared by sol-immobilization method exhibited interesting properties for the allylic oxidation of cyclohexene with molecular oxygen as the sole oxidant. The catalysts were prepared by immobilization of pre-synthesized PVA (polyvinyl alcohol)-stabilized Cu2O nanoparticles (NPs) on a magnetically recoverable support; the catalyst was further oxidized to CuO NPs after calcination at 600 °C. Both catalysts can selectively oxidize cyclohexene through allylic oxidation to give 2-cyclohexene-1-one as the main product, but CuO was identified as the most active species providing 90% cyclohexene conversion and 96% selectivity for allylic products under 100 °C and 4 bar pressure of O2 for 6 h of reaction time. The catalysts were magnetically recovered without metal leaching and could be reused in at least six consecutive runs.
期刊介绍:
The Journal of Molecular Catalysis A: Chemical publishes original, rigorous, and scholarly full papers that examine the molecular and atomic aspects of catalytic activation and reaction mechanisms in homogeneous catalysis, heterogeneous catalysis (including supported organometallic catalysis), and computational catalysis.