Photocatalytic Reduction of NO by CO on Titanium Dioxide under Visible Light Irradiation

Andrei A. Lisachenko, Ruslan V. Mikhailov, Lev L. Basov, Boris N. Shelimov, Michel Che

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Abstract

It is shown for the first time that the photoassisted reduction of NO by CO into N2 and N2O can occur on TiO2 catalysts upon visible light irradiation (λ > 380 nm) at room temperature. The selectivity of photoreduction of NO into N2 reaches 90−95%. The CO2 formed which predominantly remains on the surface can be quantitatively desorbed after completion of the photoreaction by heating TiO2 to 500 K. The rates of NO consumption and product accumulation remain virtually constant upon successive admissions of the CO−NO mixture thus indicating a high stability of catalyst activity. It is found that the quantum yield of NO photoreduction by CO is considerably greater for visible light irradiation (λ = 405 + 436 nm) than for UV irradiation (λ = 365 nm). Experiments with 18O-enriched NO revealed that, under visible light irradiation, an intense oxygen isotopic exchange between NO and TiO2 develops. The photocatalytic reaction requires the presence in nonstoichiometric TiO2-x of electron-donor centers (Ti3+ ions, F an
Original languageUndefined
Pages (from-to)14440–14447
JournalJournal of Physical Chemistry C
Volume111
Issue number39
DOIs
Publication statusPublished - 2007
Externally publishedYes

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