Artículo
Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
Rosseler, Olivier; Sleiman, Mohamad; Montesinos, Victor Nahuel
; Shavorskiy, Andrey; Keller, Valerie; Keller, Nicolas; Litter, Marta Irene
; Bluhm, Hendrik; Salmeron, Miquel; Destaillats, Hugo
Fecha de publicación:
02/2013
Editorial:
American Chemical Society
Revista:
Journal of Physical Chemistry Letters
ISSN:
1948-7185
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Self-cleaning surfaces containing TiO2 nanoparticles have been postulated to efficiently remove NOx from the atmosphere. However, UV irradiation of NOx adsorbed on TiO2 also was shown to form harmful gas-phase byproducts such as HONO and N2O that may limit their depolluting potential. Ambient pressure XPS was used to study surface and gas-phase species formed during adsorption of NO2 on TiO2 and subsequent UV irradiation at λ = 365 nm. It is shown here that NO3 -, adsorbed on TiO2 as a byproduct of NO2 disproportionation, was quantitatively converted to surface NO2 and other reduced nitrogenated species under UV irradiation in the absence of moisture. When water vapor was present, a faster NO 3 - conversion occurred, leading to a net loss of surface-bound nitrogenated species. Strongly adsorbed NO3 - in the vicinity of coadsorbed K+ cations was stable under UV light, leading to an efficient capture of nitrogenated compounds. © 2013 American Chemical Society.
Palabras clave:
Apxps
,
Denox
,
Depollution
,
Hono
,
Renoxification
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Identificadores
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Rosseler, Olivier; Sleiman, Mohamad; Montesinos, Victor Nahuel; Shavorskiy, Andrey; Keller, Valerie; et al.; Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +; American Chemical Society; Journal of Physical Chemistry Letters; 4; 3; 2-2013; 536-541
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