Species formed after NO adsorption and NO+O-2 co-adsorption on TiO2: an FTIR spectroscopic study

Authors
Hadjiivanov, K Knozinger, H
Citation
K. Hadjiivanov et H. Knozinger, Species formed after NO adsorption and NO+O-2 co-adsorption on TiO2: an FTIR spectroscopic study, PHYS CHEM P, 2(12), 2000, pp. 2803-2806
Citations number
32
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
14639076 → ACNP
Volume
2
Issue
12
Year of publication
2000
Pages
2803 - 2806
Database
ISI
SICI code
1463-9076(2000)2:12<2803:SFANAA>2.0.ZU;2-1
Abstract
Adsorption of NO and its co-adsorption with oxygen on TiO2 (Degussa P-25) w ere studied by FTIR spectroscopy. It was found that NO adsorption results i n its disproportionation to NO- (1170 cm(-1)), N2O22- (1335 cm(-1)) and nit rates (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 r esults 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 discusse d.