AN XPS STUDY OF THE INTERACTION OF MODEL Ba/TiO
2 AND Ba/ZrO
2 NSR CATALYSTS WITH NO
2
M.Yu. Smirnov1, A.V. Kalinkin1, D.A. Nazimov1,2, V.I. Bukhtiyarov1,2, E.I. Vovk1,3, E. Ozensoy3
1Boreskov Institute of Catalysis, Siberian Branch, Novosibirsk, Russia
2Novosibirsk State University, Russia
3Bilkent University, Bilkent, Ankara, Turkey
Keywords: модельные NSR катализаторы, реакция с NO
, нитрит бария, нитрат бария, рентгеновская фотоэлектронная спектроскопия, model NSR catalysts, reaction with NO
, barium nitrite, barium nitrate, X-ray photoelectron spectroscopy
Abstract
X-ray photoelectron spectroscopy is used to study the interaction of model NO
2 storage-reduction catalysts (NSR catalysts) Ba/TiO
2 and Ba/ZrO
2 with NO
2. The catalysts are prepared on the surface of ultrathin Al
2O
3 film substrates obtained by the FeCrAl alloy oxidation. It is shown that at room temperature the model catalysts react with NO
2 with the successive formation of surface barium nitrite and nitrate. The NO
2 reduction with the formation of barium nitrite at the initial step of the interaction is assumed to be accompanied by the oxidation of residual metallic barium and amorphous carbon impurity. It is found that the formation of barium nitrate proceeds more efficiently on Ba/ZrO
2 rather than on Ba/TiO
2.
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