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1D nanostructures of hydrated TiO2 for CO oxidation

Anastasia V. Grigorieva 1Eugene A. Goodilin 1Lyudmila E. Derlyukova 2Tatyana A. Anufrieva 2Yuri A. Dobrovolskii 2Yuri D. Tretyakov 1

1. M.V. Lomonosov Moscow State University, Vorobyevy gory, Moscow 119992, Russian Federation
2. Russian Academy of Sciences, Institute of Problems of Chemical Physics (IPCP RAS), Institutskii pr., 18, Chernogolovka 142432, Russian Federation

Abstract

One dimensional (1D) nanostructures are of interest because of their extraordinary functional properties originated from their structural peculiarities. Nowadays an application of individual nanoparticles in micro- and nano-electronics is not a routine procedure yet, a detailed study of individual particles behaviour is limited by instrumental facilities.

Titanium dioxide nanotubes and nanorods were obtained in a form of bundles. Both the materials could serve as a porous matrix, for instance, for drinking water filtration, water refinement in industry etc. These materials demonstrate high efficiency in photochemical processes, in catalysis, in electrochemical current sources, in solar cells. Nanotubes and also nanorods are the materials possessing high deficiency, this fact results in oxygen transport improvement and should improve the catalytic activities of nanomaterials in comparison with bulk anatase and rutile.

We studied titanium dioxide nanotubes and nanorods as semiconductor catalysts in the CO oxidation process. The CO/O2 ratio was varied from 0.75 to 4, the CO concentration we varied in a range of 1 – 25 %. We found an increase of initial conversion temperature with increasing the CO/O2 ratio. At high total concentration of reactants the 100% conversion level was not achieved on heating up to 300°C. The investigating catalytic process could be described due to the Mars-van Krevelen mechanism.  

The degradation of 1D nanostructures in the studied process is a result of dehydratation. The structures of nanotubes and nanorods changes above 500oC resulting in O-H group concentration decrease and growth of Ti3+ concentration due to XPS spectra, recrystallization. The specific surface area of nanorods increases in this process with the advent of cavities appearance. The diameter of cavities was about 5 – 10 nm.   

 

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Related papers

Presentation: Oral at E-MRS Fall Meeting 2008, Symposium D, by Anastasia V. Grigorieva
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-04 14:35
Revised:   2009-06-07 00:48