EPR Study on the Mechanism of H2O2-Based Oxidation of Alkylphenols over Titanium Single-Site Catalysts | Sciact - CRIS-system of Boreskov Institute of Catalysis

EPR Study on the Mechanism of H2O2-Based Oxidation of Alkylphenols over Titanium Single-Site Catalysts Full article

Journal

Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169

Output data

Year: 2007, Volume: 277, Number: 1-2, Pages: 185-192 Pages count : 8 DOI: 10.1016/j.molcata.2007.07.047

Tags

2,3,6-Trimethylphenol, 2-Methyl-1-naphthol, EPR spectroscopy, H2O2, Oxidation mechanism, Spin traps, Titanium single-site catalysts

Authors

Zalomaeva Olga V. ¹ , Trukhan Natalia N. ² , Ivanchikova Irina D. ¹ , Panchenko Alexander A. ² , Roduner Emil ² , Talsi Eugenii P. ¹ , Sorokin Alexander B. ³ , Rogov Vladimir A. ¹ , Kholdeeva Oxana A. ¹

Affiliations

1	Boreskov Institute of Catalysis, Acad. Lavrentiev Av. 5, 630090 Novosibirsk, Russia
2	Institute of Physical Chemistry, Stuttgart University, D-70569 Stuttgart, Germany
3	Institut de Recherches sur la Catalyse et l’Environnement de Lyon, UMR 5256 CNRS/Universite Lyon 1, 2, avenue A. Einstein, 69626 Villeurbanne Cedex, France

Funding (4)

1	Russian Foundation for Basic Research	05-03-34760
2	French National Centre for Scientific Research
3	French Embassy in Moscow
4	Alexander von Humboldt Foundation

The selective oxidation of 2,3,6-trimethylphenol (TMP) and 2-methyl-1-naphthol (MNL) with H2O2 catalyzed by titanium single-site catalysts, TiO2–SiO2 aerogel and mesostructured hydrothermally stable titanium-silicate, Ti-MMM-2, have been studied by means of EPR spectroscopic technique with spin traps. The formation of phenoxyl (naphthoxyl) and hydroxyl radical intermediates during the oxidation process have been detected using 3,5-dibromo-4-nitrosobenzene-sulfonic acid (DBNBS) and 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) spin traps, respectively. The character of the EPR spectra of the DBNBS adducts strongly depends on the nature of the organic substrate and the reaction temperature. A compilation of the EPR and by-product studies strongly supports a homolytic oxidation mechanism. Study by DR-UV–vis spectroscopy has confirmed the previously suggested chemical adsorption of phenol on the titanium center.

Zalomaeva O.V. , Trukhan N.N. , Ivanchikova I.D. , Panchenko A.A. , Roduner E. , Talsi E.P. , Sorokin A.B. , Rogov V.A. , Kholdeeva O.A.
EPR Study on the Mechanism of H2O2-Based Oxidation of Alkylphenols over Titanium Single-Site Catalysts
Journal of Molecular Catalysis A: Chemical. 2007. V.277. N1-2. P.185-192. DOI: 10.1016/j.molcata.2007.07.047 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Jun 15, 2007
Accepted:	Jul 30, 2007
Published online:	Aug 6, 2007
Published print:	Nov 16, 2007

Web of science:	WOS:000250983200024
Scopus:	2-s2.0-35348906696
Elibrary:	13542148
Chemical Abstracts:	2007:1205311
Chemical Abstracts (print):	148:191533
OpenAlex:	W1992497430

DB	Citing
Web of science	38
Scopus	40
Elibrary	37
OpenAlex	38