PHOTODECOMPOSITION OF ACETONE ON ZrO(x)-TiO(2) THIN FILMS IN O(2) EXCESS AND DEFICIT CONDITIONS
2008 (English)In: NANOSTRUCTURED MATERIALS AND NANOTECHNOLOGY, 2008, no 6, 175-186 p.Conference paper (Refereed)
We present a molecular spectroscopy study of the photo-induced decomposition of acetone on zirconium oxide (1-5 at.% Zr) modified TiO(2) thin films with anatase modification. A detailed account of the decomposition products and reaction pathways is presented. It is found that surface coordinated acetate, formate, formaldehyde and carbonate form in the course of the photoreaction. The preferred coordination is bridging bidentate (mu-coordination). The ZrO(x) addition leads to a decreased decomposition rate in synthetic air (O(2) excess) and the results in synthetic air are interpreted in terms of an increased recombination rate in the ZrO(x):TiO(2) films, rather than differences in reaction pathways. In contrast, in O(2) free environment employing N(2) gas, the photoreaction involving lattice O leads to a different decomposition pathway than when O(2) is present in excess. A striking result is that the ZrO(x):TiO(2) films exhibit an exceptional stable activity over time and usage; much better than the pure TiO(2) films. Thus despite an inferior activity the sustain activity of the ZrOx-TiO(2) films suggests means to circumvent deactivation of photocatalyst materials.
Place, publisher, year, edition, pages
2008. no 6, 175-186 p.
, Ceramic Engineering and Science Proceedings, ISSN 0196-6219 ; 28
Materials Chemistry Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-235872ISI: 000281438800019ISBN: 978-0-470-19637-3OAI: oai:DiVA.org:uu-235872DiVA: diva2:762438
31st International Cocoa Beach Conference on Advanced Ceramics and Composites, JAN 21-26, 2007, Daytona Beach, FL