dc.creator | Palacio, Magdalena | |
dc.creator | Villabrille, Paula Isabel | |
dc.creator | Palermo, Valeria | |
dc.creator | Romanelli, Gustavo Pablo | |
dc.date.accessioned | 2021-09-17T16:47:01Z | |
dc.date.accessioned | 2022-10-15T02:28:43Z | |
dc.date.available | 2021-09-17T16:47:01Z | |
dc.date.available | 2022-10-15T02:28:43Z | |
dc.date.created | 2021-09-17T16:47:01Z | |
dc.date.issued | 2020-02-10 | |
dc.identifier | Palacio, Magdalena; Villabrille, Paula Isabel; Palermo, Valeria; Romanelli, Gustavo Pablo; Titania-heteropolyacid composites (TiO2-HPA) as catalyst for the green oxidation of trimethylphenol to 2,3,5-trimethyl-p-benzoquinone; Springer; Journal of Sol-Gel Science and Technology; 95; 2; 10-2-2020; 321-331 | |
dc.identifier | 0928-0707 | |
dc.identifier | http://hdl.handle.net/11336/140721 | |
dc.identifier | 1573-4846 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/4335161 | |
dc.description.abstract | New catalysts containing phosphomolybdic acid (PMA) and vanadophosphomolybdic acid (VPMA) in a titania matrix were synthesized by the sol–gel process with different heteropolyacid loads (5%, 15%, and 30% (w/w): 5PMA-TiO2, 15PMA-TiO2, 30PMA-TiO2, 5VPMA-TiO2, 15VPMA-TiO2, and 30VPMA-TiO2). The techniques used to characterize the materials were XRD, DRS, SEM, FT-IR, 31P MAS-NMR, potentiometric titration with n-butylamine, and N2 physisorption at −196 °C. The materials were used as heterogeneous catalysts in the oxidation of 2,3,6-trimethylphenol (TMP) to 2,3,5-trimethyl-p-benzoquinone (TMBQ), a key intermediate in vitamin E synthesis. The catalysts allowed an ecofriendly TMBQ synthesis, using ethanol as solvent and aqueous hydrogen peroxide as a clean oxidizing agent, at room temperature. The conversion of TMP reached 90% and 99% for the samples with 15PMA-TiO2 and 15VPMA-TiO2, respectively, after 4 h. The amount of Mo and V in the reaction medium was determined by ICP-MS, which showed leaching of only 17–18% Mo, but 48% V. Reuse of the catalysts was performed. For 15PMA-TiO2, the conversion was maintained in the second cycle. A homolytic mechanism was proposed for TMBQ synthesis, which involved the formation of a peroxometallic species through an HPA-Ti center. [Figure not available: see fulltext.]. | |
dc.language | eng | |
dc.publisher | Springer | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/10.1007/s10971-020-05239-6 | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1007/s10971-020-05239-6 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | BENZOQUINONE | |
dc.subject | GREEN OXIDATION | |
dc.subject | HYDROGEN PEROXIDE | |
dc.subject | SOL–GEL | |
dc.subject | TITANIA-HETEROPOLYACID COMPOSITE | |
dc.title | Titania-heteropolyacid composites (TiO2-HPA) as catalyst for the green oxidation of trimethylphenol to 2,3,5-trimethyl-p-benzoquinone | |
dc.type | info:eu-repo/semantics/article | |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/publishedVersion | |