Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 426, Issue -, Pages 534-541Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2016.07.044
Keywords
Magnetic separation; Allylic oxidation; Cyclohexene; 2-cyclohexene-1-one; Copper oxide
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Funding
- Sao Paulo Research Foundation - FAPESP
- CNPq
- CAPES
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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 degrees 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 degrees C and 4 bar pressure of O-2 for 6 h of reaction time. The catalysts were magnetically recovered without metal leaching and could be reused in at least six consecutive runs. (C) 2016 Elsevier B.V. All rights reserved.
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