Exploring the mechanism of NO–C2H4 reactions on the surface of stepped Pt(332)

Hu, Yuhai; Griffiths, K.

doi:10.1016/j.susc.2008.07.027

Cited by 2 publications

(2 citation statements)

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“…Because NO is the major gas-phase product, there is a possibility of readsorbing NO on the aluminum oxide surface. In previous studies, vibrational modes of adsorbed NO have been reported and assigned to bands at ∼1700−1720 cm −1 on different surfaces. − The adsorption band near 1702 cm −1 in the adsorbed phase spectra that grows during irradiation is most likely due to NO adsorbed to oxide surfaces. Furthermore, the X-ray photoelectron spectrum (XPS) in the N(1s) region of the irradiated nitrated aluminum oxide surface revealed a peak at 401 eV, which was not observed in the XPS of samples exposed to nitric acid and not irradiated.…”

Section: Resultsmentioning

confidence: 99%

Photochemistry of Adsorbed Nitrate on Aluminum Oxide Particle Surfaces

2009

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Nitrogen oxides, including nitrogen dioxide and nitric acid, react with mineral dust particles in the atmosphere to yield adsorbed nitrate. Although nitrate ion is a well-known chromophore in natural waters, little is known about the surface photochemistry of nitrate adsorbed on mineral particles. In this study, nitrate adsorbed on aluminum oxide, a model system for mineral dust aerosol, is irradiated with broadband light (lambda > 300 nm) as a function of relative humidity (RH) in the presence of molecular oxygen. Upon irradiation, the nitrate ion readily undergoes photolysis to yield nitrogen-containing gas-phase products including NO(2), NO, and N(2)O, with NO being the major product. The relative ratio and product yields of these gas-phase products change with RH, with N(2)O production being highest at the higher relative humidities. Furthermore, an efficient dark reaction readily converts the major NO product into NO(2) during post-irradiation. Photochemical processes on mineral dust aerosol surfaces have the potential to impact the chemical balance of the atmosphere, yet little is known about these processes. In this study, the impact that adsorbed nitrate photochemistry may have on the renoxification of the atmosphere is discussed.

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Section: Resultsmentioning

confidence: 99%

Photochemistry of Adsorbed Nitrate on Aluminum Oxide Particle Surfaces

2009

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“…For example, while reactions of NO and NO 2 with hydrogen may be a primary source of NH 3 , evidence also points to reactions between hydrocarbons and NOx on Pt and other metals . Recently, the Griffiths group has undertaken a series of surface science studies of the interaction of NO and ethylene on Pt(332). − Although the presence of the coadsorbed hydrocarbon led to the production of N 2 , H 2 O, and CO 2 , no reaction intermediates were observed and no ammonia was produced. Although NO dissociates on Pt(332), one could surmise that the surface coverage of nitrogen atoms was too low to generate significant amounts of NH 3 .…”

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confidence: 99%