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    EPFR Formation from Phenol adsorption on Al2O3 and TiO2: EPR and EELS studies

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    Date
    2012
    Author
    Kiruri, L.W.
    Patterson, Matthew C.
    Keilbart, Nathan D.
    Thibodeaux, Chad A.
    Lomnicki, Slawo
    Kurtz, Richard L.
    Poliakoff, E. D.
    Dellinger, Barry
    Sprunger, Phillip T.
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    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 hours) and one slower-decayng species (lifetimes on the order of 1000 hours or more). Electron energy loss spectroscopy (EELS) measurements comparing physisorbed phenol on single-crystal TiO2(110) 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(110), indicating that this shift in the π-π* transition may be taken as a general hallmark of phenoxyl radical formation.
    URI
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3891583/
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3891583/pdf/nihms-432146.pdf
    http://ir-library.ku.ac.ke/handle/123456789/11476
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