Document Type
Article
Publication Date
1-1-2013
Abstract
We have examined the formation of environmentally persistent free radicals (EPFRs) from phenol over alumina and titania using both powder and single-crystal samples. Electron paramagnetic resonance (EPR) studies of phenol adsorbed on metal oxide powders indicates radical formation on both titania and alumina, with both oxides forming one faster-decaying species (lifetime on the order of 50-100 h) and one slower-decaying species (lifetimes on the order of 1000 h or more). Electron energy loss spec- troscopy (EELS) measurements comparing physisorbed phenol on single-crystal TiO2(1 1 0) to phenoxyl radicals on the same substrate indicate distinct changes in the π-π* transitions from phenol after radical formation. The identical shifts are observed from EELS studies of phenoxyl radicals on ultrathin alumina grown on NiAl(11 0), indicating that this shift in the π-π* transition may be taken as a general hallmark of phenoxyl radical formation. © 2012 Elsevier B.V. All rights reserved.
Publication Source (Journal or Book title)
Chemical Physics
First Page
277
Last Page
282
Recommended Citation
Patterson, M., Keilbart, N., Kiruri, L., Thibodeaux, C., Lomnicki, S., Kurtz, R., Poliakoff, E., Dellinger, B., & Sprunger, P. (2013). EPFR formation from phenol adsorption on Al2O3 and TiO2: EPR and EELS studies. Chemical Physics, 422, 277-282. https://doi.org/10.1016/j.chemphys.2012.12.003