Amorphous Cr/SiO.sub.2 Materials Hydrothermally Treated: Liquid Phase Cyclohexanol Oxidation

Amorphous Cr-SiO.sub.2 materials were synthesized by the sol-gel method and hydrothermally treated at temperatures between 150 and 220 °C. These materials were used as catalysts for cyclohexanol oxidation with H.sub.2O.sub.2 as oxidant and CH.sub.3CN as a solvent. They were responsible for the decom...

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Bibliographic Details
Published in:Catalysis letters 2018-07, Vol.148 (7), p.2082
Main Authors: Miranda, José Feliciano, Cuesta Zapata, Pablo M, Gonzo, Elio E, Parentis, Mónica L, Davies, Lilian E, Bonini, Norberto A
Format: Article
Language:English
Subjects:
Cyclohexanol
Leaching
Oxidation-reduction reactions
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Summary:Amorphous Cr-SiO.sub.2 materials were synthesized by the sol-gel method and hydrothermally treated at temperatures between 150 and 220 °C. These materials were used as catalysts for cyclohexanol oxidation with H.sub.2O.sub.2 as oxidant and CH.sub.3CN as a solvent. They were responsible for the decomposition of H.sub.2O.sub.2, which triggers, by a free radical mechanism in the homogeneous phase, the oxidation or degradation of the hydrocarbon chain. Metal leaching causes a drop in catalytic activity when the material is recycled. Studies on the hydrothermal treatment effect on the leaching process have demonstrated that the higher the hydrothermal treatment temperature, the higher the metal/support interaction, leading to a diminution of the leaching process. Under mild reaction conditions, and using TBHP as oxidant, leaching was reduced, and improvements were obtained on the selectivity towards the formation of cyclohexanone. The use of these catalysts in the oxidation of verbenol, an allylic alcohol, showed a significant increase in the substrate conversion and in the selectivity to carbonyl derivative formation.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-018-2422-4