Journal
JOURNAL OF CATALYSIS
Volume 295, Issue -, Pages 45-58Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.07.022
Keywords
CO oxidation; Perovskite; Copper; Palladium; Oxygen isotopic exchange; Oxygen mobility; Oxidation mechanism
Categories
Funding
- China Scholarship Council (CSC)
- National Natural Science Foundation of China [20977004, 21177008, 21121064]
- New Century Program for Excellent Talents in University [NCET-10-0204]
Ask authors/readers for more resources
Oxygen mobility in LaFe1-x-yCuxPdyO3-delta is evaluated using oxygen isotopic exchange and equilibration techniques. Reducibility and oxygen desorption are strongly altered by the properties of the substituting cation, even if iron remains hardly reducible up to 1000 degrees C. In addition, large differences in oxygen mobility are measured by oxygen isotopic exchange. Large higher oxygen mobility is achieved over the Cu-containing sample, while Pd substitution inhibits oxygen mobility. These observations correlate well with the evolution of catalytic activity for low-temperature CO oxidation. Indeed. Cu-containing materials present the highest catalytic activities, while Pd-substituted structure shows a low-temperature activity similar as the Fe parent material. CO oxidation is usually considered as a suprafacial reaction, where only adsorbed gas-phase species are involved. Nevertheless, the participation of oxygen surface species to the reaction (in pure ferrite structure), or from the bulk (in Cu-substituted material), is strongly suggested by oxygen mobility measurement, suggesting a redox-type oxidation mechanism. (C) 2012 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available