Propylene glycol oxidation with hydrogen peroxide over Zr-containing metal-organic framework UiO-66

Propylene glycol oxidation with hydrogen peroxide over Zr-containing metal-organic framework UiO-66

[Display omitted] •UiO-66 can be employed as a heterogeneous catalyst in liquid-phase selective oxidation using H2O2.•Hydroxyacetone is the main product in selective oxidation of propylene glycol over UiO-66.•Propylene glycol oxidation proceeds via radical chain mechanism.•Solvent nature affects pro...

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Bibliographic Details
Published in:Catalysis today Vol. 333; pp. 47 - 53
Main Authors: Torbina, Viktoriia V., Nedoseykina, Nadezhda S., Ivanchikova, Irina D., Kholdeeva, Oxana A., Vodyankina, Olga V.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-08-2019
Subjects:
Alcohol oxidation
Hydrogen peroxide
Hydroxyacetone
Metal-organic frameworks
Propylene glycol
Selective oxidation
UiO-66
Zirconium
Selective oxidation
Propylene glycol
Zirconium
Hydroxyacetone
Hydrogen peroxide
UiO-66
Alcohol oxidation
Metal-organic frameworks
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Summary:[Display omitted] •UiO-66 can be employed as a heterogeneous catalyst in liquid-phase selective oxidation using H2O2.•Hydroxyacetone is the main product in selective oxidation of propylene glycol over UiO-66.•Propylene glycol oxidation proceeds via radical chain mechanism.•Solvent nature affects propylene glycol adsorption, oxidant efficiency and product yields.•The catalyst is stable under the reaction conditions and can be reused. Zirconium-based metal–organic framework UiO-66 catalyzes oxidation of propylene glycol (PG) using hydrogen peroxide as green oxidant. Hydroxyacetone (HA) is the main oxidation product, while the main side product is acetic acid (AcA). The nature of the solvent drastically affects PG adsorption, oxidant utilization efficiency and product yields. The best catalytic performance (85% selectivity towards HA at ca. 10% PG conversion) was achieved with water–acetonitrile (3/7 (v/v)) mixture as a solvent. Additives of radical chain scavengers produce a rate-inhibiting effect, suggesting radical chain mechanism of the oxidation process. The PG oxidation over UiO-66 proceeds without leaching of the active metal into solution, and the catalysis has a truly heterogeneous nature. The catalyst can be recycled without significant loss of activity and selectivity and retains its structure during at least five reuses.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2018.11.063