Amorphization of Degussa nanosized TiO2 caused by its modification

E. Khramov, Y. Kotolevich, J. C. García Ramos, A. Pestryakov, Y. Zubavichus, N. Bogdanchikova

Research output: Contribution to journalArticle

Abstract

Influence of modification with metals Au and Ag, oxides of Fe, Mg and Ce and their combinations on amorphization of widely used commercial nanosized TiO2 (Degussa P25) was studied with SR-XRD and EXAFS methods. These systems were chosen taking into account their potential on catalytic properties for biomass to biodiesel transformation, as it was shown in model reaction of liquid phase n-octanol oxidation as well as low-temperature CO oxidation for “cold start” of the neutralizers of car exhaust gases. Instability of rutile, the most stable TiO2 phase, in the presence of the additives was found. Application of EXAFS method, rarely used for crystalline structure transfer studies, led to elucidation of this apparent effect, which was explained by higher level of amorphization of rutile than anatase. Literature data indicate that bulky TiO2 doping leads to either increase of rutile/anatase ratio complete inhibition of anatase to rutile transformation. Dissimilar phase composition changes, revealed in this work for modified nanodispersed TiO2, was attributed to size effect.

LanguageEnglish
Pages312-317
Number of pages6
JournalFuel
Volume234
DOIs
Publication statusPublished - 15 Dec 2018

Fingerprint

Amorphization
Titanium dioxide
Oxidation
Biodiesel
Exhaust gases
Phase composition
Biomass
Railroad cars
Doping (additives)
Crystalline materials
Oxides
1-Octanol
Liquids
Metals
Biofuels
Carbon Monoxide
titanium dioxide
Temperature

Keywords

  • Amorphization
  • Degussa P25
  • EXAFS
  • X-ray diffraction on synchrotron radiation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Khramov, E., Kotolevich, Y., García Ramos, J. C., Pestryakov, A., Zubavichus, Y., & Bogdanchikova, N. (2018). Amorphization of Degussa nanosized TiO2 caused by its modification. Fuel, 234, 312-317. https://doi.org/10.1016/j.fuel.2018.06.127

Amorphization of Degussa nanosized TiO2 caused by its modification. / Khramov, E.; Kotolevich, Y.; García Ramos, J. C.; Pestryakov, A.; Zubavichus, Y.; Bogdanchikova, N.

In: Fuel, Vol. 234, 15.12.2018, p. 312-317.

Research output: Contribution to journalArticle

Khramov, E, Kotolevich, Y, García Ramos, JC, Pestryakov, A, Zubavichus, Y & Bogdanchikova, N 2018, 'Amorphization of Degussa nanosized TiO2 caused by its modification' Fuel, vol. 234, pp. 312-317. https://doi.org/10.1016/j.fuel.2018.06.127
Khramov E, Kotolevich Y, García Ramos JC, Pestryakov A, Zubavichus Y, Bogdanchikova N. Amorphization of Degussa nanosized TiO2 caused by its modification. Fuel. 2018 Dec 15;234:312-317. https://doi.org/10.1016/j.fuel.2018.06.127
Khramov, E. ; Kotolevich, Y. ; García Ramos, J. C. ; Pestryakov, A. ; Zubavichus, Y. ; Bogdanchikova, N. / Amorphization of Degussa nanosized TiO2 caused by its modification. In: Fuel. 2018 ; Vol. 234. pp. 312-317.
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