Supercritical CO2 as sustainable solvent for selective photo-oxidation of monoterpenes with dioxo-Mo complex/TiO2-nanotubes

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2025-04-03 DOI:10.1016/j.cattod.2025.115305

Henry Martínez Q. , Estefany Pájaro , Edgar A. Páez-Mozo , Henry Adolfo Lambis-Miranda , Fernando Martínez O.

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Abstract

The selective oxidation of monoterpenes to the corresponding epoxides by the photo-stimulated Oxygen Atom Transfer (OAT) reaction was achieved in the supercritical CO₂ medium (sc-CO₂) under the action of molecular oxygen and the catalytic action of the dioxo-molybdenum complex anchored on TiO₂ nanotubes, MoCl₂O₂(2,2′-bipyridine-4,4′-dicarboxylato)/TiO₂-NT, [MoCl₂O₂(Bipy)/TiO₂-NT]. It was observed that the supercritical medium enhanced the photo-stimulated oxygen transfer activity compared to the previously reported liquid-phase reaction conducted with acetonitrile as a solvent. The reaction rate in supercritical CO₂ (sc-CO₂) showed a pronounced dependence on pressure, reaching a maximum at about 14 MPa at 313.15 K. This fact can be attributed to the influence of pressure on the phase behavior of the reaction system, the diffusivity of the components, and the solvent power of sc-CO₂. In order to propose future applications, turpentine oil was also evaluated in the photo-oxidation reaction with O₂, showing that the mixture of monoterpenes can be oxidized to form the respective epoxides.

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.