期刊
CATALYSIS COMMUNICATIONS
卷 8, 期 3, 页码 299-304出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2006.06.027
关键词
honeycomb supported Co3O4-CeO2; promotion effect of Pd-Pt; CO and CH4 oxidation; low-temperature activity
A structured Co3O4-CeO2 composite oxide, containing 30% by weight of Co3O4, has been prepared over a cordieritic honeycomb support. The bimetallic, Pd-Pt catalyst has been obtained by impregnation of the supported Co3O4-CeO2 with Pd and Pt precursors in order to obtain a total metal loading of 50 g/ft(3). CO, CH4 combined oxidation tests were performed over the catalyzed monoliths in realistic conditions, namely GHSV = 100,000 h(-1) and reaction feed close to emission from bi-fuel vehicles. The Pd-Pt un-promoted Co3O4-CeO2 is promising for cold-start application, showing massive CO conversion below 100 degrees C, in lean condition. A strong enhancement of the CH4 oxidation activity, between 400 and 600 degrees C, has been observed by addition to the Co3O4-CeO2 of a low amount of Pd-Pt metals. (c) 2006 Elsevier B.V. All rights reserved.
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