Adsorption of NO and its co-adsorption with oxygen on TiO2 (Degussa P-25) were studied by FTIR spectroscopy. It was found that NO adsorption results in its disproportionation to NO− (1170 cm−1), N2O22− (1335 cm−1) and nitrates (1650–1550 and 1240–1220 cm−1). The nitrate bands develop with time and coordinated NO (ca. 1900 cm−1) is formed. Addition of oxygen to NO results in a strong increase in concentration of the nitrates and formation of NO+ (2206 cm−1). In addition, species assigned to nitrocomplexes (1520 and 1284 cm−1) are found. The stability and reactivity of the different surface compounds as well as their interconversion are studied and discussed.
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Hadjiivanov et al. (2000) studied this question.
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