TY - JOUR
T1 - Acid-base properties of alumina-magnesia mixed oxides. Part 4. - Infrared study of adsorption of carbon dioxide
AU - Lercher, Johannes A.
AU - Colombier, Christian
AU - Noller, Heinrich
PY - 1984
Y1 - 1984
N2 - The adsorption of CO2 on alumina, alumina-magnesia mixed oxides and magnesia has been studied by means of i.r. transmission absorption spectroscopy. CO2 was found to be weakly adsorbed on accessible cations. With high densities of surface hydroxyl groups lateral interactions of these cationicly bound CO2 molecules with hydroxyl groups have also been observed. Several surface carbonates were formed and were identified as bicarbonates and monodentate, bidentate and ionic carbonates. The wavenumbers of the symmetric stretching vibration of the surface bicarbonates and the wavenumber difference of the symmetric and antisymmetric stretching vibration of the monodentate carbonates decreased with increasing content of MgO in the mixed oxides.
AB - The adsorption of CO2 on alumina, alumina-magnesia mixed oxides and magnesia has been studied by means of i.r. transmission absorption spectroscopy. CO2 was found to be weakly adsorbed on accessible cations. With high densities of surface hydroxyl groups lateral interactions of these cationicly bound CO2 molecules with hydroxyl groups have also been observed. Several surface carbonates were formed and were identified as bicarbonates and monodentate, bidentate and ionic carbonates. The wavenumbers of the symmetric stretching vibration of the surface bicarbonates and the wavenumber difference of the symmetric and antisymmetric stretching vibration of the monodentate carbonates decreased with increasing content of MgO in the mixed oxides.
UR - http://www.scopus.com/inward/record.url?scp=37049096388&partnerID=8YFLogxK
U2 - 10.1039/F19848000949
DO - 10.1039/F19848000949
M3 - Article
AN - SCOPUS:37049096388
SN - 0300-9599
VL - 80
SP - 949
EP - 959
JO - Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
JF - Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
IS - 4
ER -