期刊
CHEMCATCHEM
卷 11, 期 15, 页码 3505-3521出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201900752
关键词
Palladium; cerium oxide; CO oxidation; Nanoparticles; Structure-activity relationships
Structural transformations in Pd/CeO2 catalysts during their calcination over a wide temperature range (450-1200 degrees C) were studied with structural, spectroscopic, and kinetic methods (XRD, TEM, XPS, and TPR). Two synthetic methods were applied: coprecipitation and incipient wetness impregnation. The impregnation synthesis produced the best low-temperature oxidation of CO (LTO CO) for the catalysts that were calcined at 450-900 degrees C. Their high LTO CO activities could be attributed to the formation of reactive surface clusters at the PdO-CeO2 interface. The coprecipitation synthesis produced a homogeneous PdxCe1-xO2-delta solid solution with no Pd nanostructured particles. Decomposition of the solid solution phase occurred at 800-850 degrees C and resulted in the formation of unusual Pd species, i. e., Pd(Ce)O-x superstructures and agglomerates consisting of 2 nm PdO particles. Further calcination of the catalysts resulted in the formation of mixed Pd-0-PdO-CeO2 nanoparticles with a heterophase morphology that provided high thermal stability. These catalysts demonstrated capability for CO oxidation at temperatures below 100 degrees C after calcination at 1200 degrees C.
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