期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 36, 期 15, 页码 9139-9150出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2011.04.217
关键词
Gold catalysts; CO preferential oxidation; Ceria; Manganese oxide; Synthesis pH; Au loading
资金
- National Natural Science Foundation of China [20876110, 21076146]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20090032110013]
- Program of New Century Excellent Talents in University of China [NCET-07-0599]
- Program of Introducing Talents of Discipline [B06006]
As a novel and rather convenient method, ultrasonic pretreatment was employed for the preparation of nanostructured Au/MnOx-CeO2 (Mn/Ce = 1:1) catalysts which were used for CO preferential oxidation. The effects of synthesis pH (7.0-11.0) and Au loading (0.5-5.0 wt.%) on the performance of these catalysts were systematically investigated. It is found that the Au(1.0)/MnOx-CeO2-10.0 with 1.0 wt.% Au prepared at pH = 10.0 exhibits the best catalytic performance, giving not only the highest CO conversion of 90.9% but also the highest oxygen to CO2 selectivity of 47.8% at 120 degrees C. The results of XRD, HR-TEM and XPS indicate that this catalyst possesses the highest dispersion of Au species and the largest amount of surface adsorbed oxygen species, which facilitates CO oxidation. The H-2-TPR results reveal that the selectivity of oxygen to CO2 is mainly determined by the reducibility of Au species in the catalysts. The strong interaction between Au species and the supports in the catalyst Au(1.0)/MnOx-CeO2-10.0 decreases its capability for H-2 dissociation, effectively inhibiting the hydrogen spillover, as a result, the selectivity of oxygen to CO2 is remarkably increased. Copyright (c) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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