TY - JOUR

T1 - Infrared study of ozone adsorption on CeO2

AU - Bulanin, K. M.

AU - Lavalley, J. C.

AU - Lamotte, J.

AU - Mariey, L.

AU - Tsyganenko, N. M.

AU - Tsyganenko, A. A.

PY - 1998/8/27

Y1 - 1998/8/27

N2 - Ozone (O3) adsorption on CeO2 pretreated under different conditions and characterized by low-temperature CO adsorption was studied by Fourier transform infrared (FTIR) spectroscopy at 77-300 K. Preliminary exposure to CO2, pyridine, acetonitrile, or methanol at 293 K or to CO at 77 K, as well as adsorption of 18O substituted O3 were used to clarify the nature of adsorption sites and the structure of the surface species. In O3 molecule is no longer symmetric but is bound to a surface Ce4+ ion via one of its terminal oxygen atoms. Basic surface sites of the samples pretreated at 773 K account for O3 decomposition, which occurs almost explosively at 77 K but could be inhibited if O3 adsorption is performed from the solution in liquid oxygen. Formation of ozonide O3- (bands at 792 and 772 cm-1) and superoxide O2- (band at 1128 cm-1) species was detected; these species are believed to be the intermediates of O3 decomposition on basic sites. On ceria, O3 does not react at 77 K with adsorbed CO, but ozonolysis of surface methoxy groups proceeds slowly, leading to a formate surface species.

AB - Ozone (O3) adsorption on CeO2 pretreated under different conditions and characterized by low-temperature CO adsorption was studied by Fourier transform infrared (FTIR) spectroscopy at 77-300 K. Preliminary exposure to CO2, pyridine, acetonitrile, or methanol at 293 K or to CO at 77 K, as well as adsorption of 18O substituted O3 were used to clarify the nature of adsorption sites and the structure of the surface species. In O3 molecule is no longer symmetric but is bound to a surface Ce4+ ion via one of its terminal oxygen atoms. Basic surface sites of the samples pretreated at 773 K account for O3 decomposition, which occurs almost explosively at 77 K but could be inhibited if O3 adsorption is performed from the solution in liquid oxygen. Formation of ozonide O3- (bands at 792 and 772 cm-1) and superoxide O2- (band at 1128 cm-1) species was detected; these species are believed to be the intermediates of O3 decomposition on basic sites. On ceria, O3 does not react at 77 K with adsorbed CO, but ozonolysis of surface methoxy groups proceeds slowly, leading to a formate surface species.

UR - http://www.scopus.com/inward/record.url?scp=0001085619&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0001085619

VL - 102

SP - 6809

EP - 6816

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

IS - 35

ER -