TY - JOUR

T1 - FTIR and TPD Study of the Room Temperature Interaction of a NO−Oxygen Mixture and of NO2 with Titanium Dioxide

AU - Mikhaylov, R.V.

AU - Lisachenko, A.A.

AU - Shelimov, B.N.

AU - Kazansky, V.B.

AU - Martra, G.

AU - Coluccia, S.

PY - 2013

Y1 - 2013

N2 - Kinetics and mechanism of NO and oxygen coadsorption on TiO2 at room temperature, which is the key step of the catalytic removal of NOx pollutants from air, were studied. NO adsorption on TiO2 in the absence of oxygen is weak and reversible, but it is found to strongly increase in the presence of oxygen. The ratio between the amount of adsorbed NO and O2 in the course of adsorption is constant and close to three. A FTIR spectroscopic study reveals that the amount and composition of N-containing species on the TiO2 surface strongly depend on the contact time with the initial NO−O2 mixture and on its composition. At relatively small exposures, IR bands assigned to NO− and nitrosyl complexes Tin+−NO (n = 3−4) are predominant in the spectra. With increasing contact time, NO− disappears, and IR bands of NO3− and possibly NO2− appear and grow. IR spectra observed upon NO2 adsorption are similar to those after exposure to NO−O2 mixtures. Exposure of the sample with preadsorbed 14NO2 to gaseous 15NO results in a cha

AB - Kinetics and mechanism of NO and oxygen coadsorption on TiO2 at room temperature, which is the key step of the catalytic removal of NOx pollutants from air, were studied. NO adsorption on TiO2 in the absence of oxygen is weak and reversible, but it is found to strongly increase in the presence of oxygen. The ratio between the amount of adsorbed NO and O2 in the course of adsorption is constant and close to three. A FTIR spectroscopic study reveals that the amount and composition of N-containing species on the TiO2 surface strongly depend on the contact time with the initial NO−O2 mixture and on its composition. At relatively small exposures, IR bands assigned to NO− and nitrosyl complexes Tin+−NO (n = 3−4) are predominant in the spectra. With increasing contact time, NO− disappears, and IR bands of NO3− and possibly NO2− appear and grow. IR spectra observed upon NO2 adsorption are similar to those after exposure to NO−O2 mixtures. Exposure of the sample with preadsorbed 14NO2 to gaseous 15NO results in a cha

KW - NO

KW - NO2

KW - O2

KW - coadsorption

KW - TiO2

KW - FTIR spectroscopy

KW - TPD

KW - nitrates

KW - nitrites

KW - isotopic replacement

U2 - 10.1021/jp311593s

DO - 10.1021/jp311593s

M3 - Article

VL - 117

SP - 10345

EP - 10352

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 20

ER -