Title of article :
Ceria reoxidation by CO2: A model study
Author/Authors :
T. Staudt، نويسنده , , Y. Lykhach، نويسنده , , N. Tsud، نويسنده , , T. Sk?la، نويسنده , , K.C. Prince، نويسنده , , V. Matolin، نويسنده , , J. Libuda، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
5
From page :
181
To page :
185
Abstract :
The activation of CO2 on ceria-based catalysts opens chemical routes to the use of CO2 as an oxidizing agent. Toward a better understanding of the underlying surface reactions, we have performed a model study on well-defined CeO2−x thin films on Cu(1 1 1) under ultra-high-vacuum conditions. Resonant photoelectron spectroscopy is used as a highly sensitive tool to monitor changes in the oxidation state of cerium as a function of CO2 exposure and thermal treatment. It is shown that partial reoxidation of CeO2−x by CO2 occurs with high reaction probabilities (i) even at temperatures as low as room temperature, (ii) on pure CeO2−x in the complete absence of any noble metal co-catalysts, and (iii) in the absence of surface hydroxyl groups or water. In contrast to previous studies on ceria powders, the findings clearly demonstrate the high activity of pure hydroxyl- and metal-free ceria surfaces for CO2 activation, even at low reaction temperatures.
Keywords :
H-MCM-22 , H-Mordenite , Reaction Mechanism , Isotopic labeling , MTH , H-Beta , MTO , MTG
Journal title :
Journal of Catalysis
Serial Year :
2010
Journal title :
Journal of Catalysis
Record number :
1226078
Link To Document :
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