Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Manifestations of the acidity of adsorbed molecules in H-bonded complexes with silanol groups : Lewis acidity of ozone. / Tsyganenko, A. A.; Storozheva, E. N.; Manoilova, O. V.
в: Catalysis Today, Том 70, № 1-3, 15.10.2001, стр. 59-71.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Manifestations of the acidity of adsorbed molecules in H-bonded complexes with silanol groups
T2 - Lewis acidity of ozone
AU - Tsyganenko, A. A.
AU - Storozheva, E. N.
AU - Manoilova, O. V.
PY - 2001/10/15
Y1 - 2001/10/15
N2 - Adsorption of binary mixtures of gases with acidic and basic properties on silica surface has been studied by FTIR spectroscopy at low temperatures. After introducing acidic molecules to silica sample with preadsorbed base, additional shifts of the band of silanol groups already perturbed by bases occur that are interpreted as caused by interaction of the acid with the oxygen atom of silanol group, leading to the H-bond strengthening. Comparison of the effects produced by different acidic molecules enables an estimate of their relative electron-accepting (acidic) properties to be made, including the acidity of ozone that is not easy to estimate by other methods. For strong bases, such as ammonia, pyridine or 2,6-dimethylpyridine, addition of SO2 or NO2 enhances the acidity of silanol groups to such extent that proton transfer occurs, indicating the appearance of Brønsted acidity induced by coadsorbed acids.
AB - Adsorption of binary mixtures of gases with acidic and basic properties on silica surface has been studied by FTIR spectroscopy at low temperatures. After introducing acidic molecules to silica sample with preadsorbed base, additional shifts of the band of silanol groups already perturbed by bases occur that are interpreted as caused by interaction of the acid with the oxygen atom of silanol group, leading to the H-bond strengthening. Comparison of the effects produced by different acidic molecules enables an estimate of their relative electron-accepting (acidic) properties to be made, including the acidity of ozone that is not easy to estimate by other methods. For strong bases, such as ammonia, pyridine or 2,6-dimethylpyridine, addition of SO2 or NO2 enhances the acidity of silanol groups to such extent that proton transfer occurs, indicating the appearance of Brønsted acidity induced by coadsorbed acids.
KW - Adsorption
KW - Brønsted acidity
KW - H-bond
KW - IR spectroscopy
KW - Lewis acidity
KW - Ozone
KW - Silica
UR - http://www.scopus.com/inward/record.url?scp=0035885995&partnerID=8YFLogxK
U2 - 10.1016/S0920-5861(01)00407-2
DO - 10.1016/S0920-5861(01)00407-2
M3 - Article
AN - SCOPUS:0035885995
VL - 70
SP - 59
EP - 71
JO - Catalysis Today
JF - Catalysis Today
SN - 0920-5861
IS - 1-3
ER -
ID: 41681228