Electron spin resonance study on Mo SiO2 and Mo TiO2 with adsorbed benzene

  • M. Ignatovych Інститут хімії поверхні НАН України
  • V. Teslenko Institute of Semiconductor Physics of National Academy of Sciences
  • A. Eremenko Інститут хімії поверхні НАН України
  • V. Ogenko Інститут хімії поверхні НАН України
  • A. Chuiko Інститут хімії поверхні НАН України

Анотація

The study is devoted to ESR-investigation of the primary processes upon chemisorption of benzene molecules onto the molybdenum supported on dispersed SiO2 and TiO2 samples. It has been confirmed that benzene chemisorption onto the Mo6+ species results in one-electron transfer in the ground state and paramagnetic species formation, namely reduced molybdenum species (Mo5+ species) and radicals of benzene. Computer treatment of ESR experimental data revealed that there are several types of Mo5+ species and benzene radicals, the assignment of which is proposed.

Посилання

Che M., Figuras F., Forissier M., McAteer J., Perrin M., Portefaix J. L., and Praliaud H. Influence of the symmetry of the molybdenum ion on the selectivity for propylene oxidation // Proc. 6th Int. Congress on Catalysis, London, 1976. - V.1. - P.261-270.

Che M., McAteer J.C., and Tench A.J. Electron paramagnetic resonance study of molybdenum supported calalysts labelled with 95Mo // J. Chem. Soc., Faraday Trans. - 1978. - V.74. - P.2378-2384.

Iwasawa Y., Nakano Y., and Ogasawara S. Surface properties and catalytic activity of Mo‑fixed catalyst // J. Chem. Soc., Faraday Trans. - 1978. - V.74. - P.2968-2981.

Iwasawa Y. and Ogasawara S. Spectroscopic study on the surface structure and environment of fixed Mo- catalysts // J. Chem. Soc., Faraday Trans. - 1979. - V.75 - P.1465-1475.

Anpo M., Suzuki T., and Kubokawa Y. Photoluminescence evidence for the influence of symmetry of molybdenum ions upon photocatalytic activity // J. Phys. Chem. - 1984. - V.88. - P.5778-5779.

Castellan A., Vart J.C.J., Vaghi A., and Giordano N. Structure and catalytic activity of MoO3 SiO2 –system. Solid state properties // J. Catal. - 1976. - V.36 - P.162-172.

Louis C. and Che M. EPR and diffuse reflectance studies of physicochemical phenomena ocurring during the preparation of Mo/SiO2.catalysts by the grafting method // J. Catal. - 1992. - V.135. - P.156-172.

Seyedmonir S.R. and Howe R.F. Redox chemistry of molybdena-silica catalysts // J. Catal. - 1988. - V. 110. - P.229-242.

Fricke R., Hanke W., and Ohlmann G. Studies on catalytically active surface compounds. Preparation of Mo/SiO2 catalysts from MoCl5 studied by ESR and UV-vis spectroscopy // J. Catal. – 1983. - V.79. - P.1-12.

Kucherov A.V. and Slinkin A.A.. Introduction of Cr(V), Mo(V) and V(IV) ions in cationic positions of high silica zeolites by a solid-state reaction // Zeolites. – 1987. -V.7. - P.38‑42.

Stencel J.M., Diehl J.R., D’Este J.R., Makovsky L.E., Rodrigo L., Marcinkowska K., Adnot A., Roberge P.C., and Kaliaguine S. // J. Phys. Chem. - 1986. - V.90. - P.4739‑4743.

Plyuto Yu.V., Babich I.V., Plyuto I.V., Van Langeveld A.D., and Moulijn J.A. Characterization of molybdenum(VI) oxo-species aggregation in MoO3/Al2O3 and MoO3/SiO2 model systems // Europacat-III: Abstracts. - 1997. - P.849.

Kravets G.A., Shokhireva T.Kh., Anufrienko V.F., and Yurieva T.M. ESR studies of molybdenum in Ti-Mo heteropolyacid supported on TiO2 // React. Kinet. Catal. Lett. - 1982. - V.19. - P.85-89.

Ignatovych M.V., Eremenko A.M., and Chuiko A.A. Photoactivated electron transfer in the surface complexes of aromatic molecules on silica // Dop. Akad. Nauk Ukrainy. – 1989 - N1. - P.39-41.

Ignatovych M., Ogenko V., and Chuiko A. Spectral study of the donor-acceptor complexes of aromatic moleculees adsorbed on zeolites // Stud. Surf. Sci. Catal. -1995. - V.94. - P.614-618.

Ignatovych M., Eremenko A., Ogenko V., and Chuiko A. Photoproceses in Mo-SiO2 and V-SiO2 with adsorbed aromatic molecules // XV IUPAC Symposium on Photochemistry, Prague, 1994. - Book of Abstracts. - P.265.

Yoon K.B. Electron and charge-transfer reaction within zeolites // Chem. Rev. – 1993. - V.93. - P.321-339 (and references therein).

Che M., Fournier M., and Launay J.P. The analog of surface molybdenyl ion in Mo/SiO2 supported catalysts: the isopolyanion Mo6O193- studied by EPR and UV-visible spectroscopy. Comparision with other molybdenyl compounds // J. Chem. Phys. - 1979. - V.71. - P.1954-1960.

Serwicka E. ESR study of 12-molybdophosphate catalyst // Z. Phys. Chem. – 1987. - Bd.152. - S.105-112.

Serwicka E. ESR study of supported H3PMo12O40/K3PMo12O40 catalysts for the oxidation of acrolein // Z. Phys. Chem. - 1989. - Bd.165. - S.95-101.

Опубліковано
2002-06-12
Як цитувати
Ignatovych, M., Teslenko, V., Eremenko, A., Ogenko, V., & Chuiko, A. (2002). Electron spin resonance study on Mo SiO2 and Mo TiO2 with adsorbed benzene. Поверхня, (7-8), 115-124. вилучено із http://surfacezbir.com.ua/index.php/surface/article/view/89
Розділ
Surface chemistry of silica and related sorbents