How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts (Articolo in rivista) (literal)

Anno

• 2009-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1016/j.cattod.2008.06.005 (literal)

Alternative label

• Kholdeeva, O. A.; Ivanchikova, I. D.; Guidotti, M.; Ravasio, N.; Sgobba, M.; Barmatova, M. V. (2009)
  How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts
  in Catalysis Today; Elsevier, Amsterdam (Paesi Bassi)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Kholdeeva, O. A.; Ivanchikova, I. D.; Guidotti, M.; Ravasio, N.; Sgobba, M.; Barmatova, M. V. (literal)

Pagina inizio

• 330 (literal)

Pagina fine

• 336 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 141 (literal)

Rivista

• Catalysis Today (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 7 (literal)

Note

• Scopu (literal)
• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• CNR, ISTM, via Venezian 21, I-20133 Milan, Italy Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia (literal)

Titolo

• How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts (literal)

Abstract

• A comprehensive study of structure/activity/selectivity relationships and mechanistic aspects of the oxidation of 2,3,6-trimethylphenol (TMP) with aqueous H2O2 over a wide variety of titanium-silicate catalysts allowed us to infer requirements to an optimal catalyst and optimal reaction conditions for this reaction and to produce 2,3,5-trimethyl-1,4-benzoquinone (TMBQ, Vitamin E precursor) with nearly 100% selectivity at 100% substrate conversion. The main by-products in the TMP oxidation are C–C and C–O dimers, formed by coupling of intermediate phenoxyl radicals. The formation of TMBQ is favoured by (1) a poor coordinating solvent (MeCN), (2) elevated temperature (80 8C), (3) lowTMP concentration (not higher than 0.1 M), (4) high H2O2/TMPmolar ratio (ca. 3.5), and (5) low TMP/Ti ratio (<10–20). The crucial factors which determine the selectivity of Ti,Si-catalysts in TMP oxidation to TMBQ are mesoporosity and an optimal surface concentration (ca. 0.7–1.0 Ti atoms/nm2) of accessible highly dispersed, probably, dimeric Ti(IV) species. The catalysts prepared by a simple, affordable and cheap synthesis methodology via grafting titanium(IV) precursors onto the surface of commercial mesoporous silica completely fulfil these requirements and thus can be viewed as promising catalysts for environmentally benign TMBQ production. (literal)

Editore

• Elsevier (Editore)

Prodotto di

• Catalizzatori per la produzione chemo-, regio- e stereoselettiva di fine chemicals (PM.P03.002.002) (Modulo)
• Istituto di scienze e tecnologie molecolari (ISTM) (Istituto)

Autore CNR

• MATTEO GUIDOTTI (Unità di personale interno)
• MARIA NICOLETTA RAVASIO (Persona)

Insieme di parole chiave

• Keywords of "How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts" (Insieme di parole chiave)

Incoming links:

Prodotto

• Istituto di scienze e tecnologie molecolari (ISTM) (Istituto)
• Catalizzatori per la produzione chemo-, regio- e stereoselettiva di fine chemicals (PM.P03.002.002) (Modulo)

Autore CNR di

• MARIA NICOLETTA RAVASIO (Persona)
• MATTEO GUIDOTTI (Unità di personale interno)

Editore di

• Elsevier (Editore)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Catalysis Today (Rivista)

Insieme di parole chiave di

• Keywords of "How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts" (Insieme di parole chiave)