Thermally Induced Structural Evolution of Palladium-Ceria Catalysts. Implication for CO Oxidation

Результат исследования: Научные публикации в периодических изданияхстатья

4 Цитирования (Scopus)

Аннотация

Structural transformations in Pd/CeO2 catalysts during their calcination over a wide temperature range (450-1200 °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 °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-δ solid solution with no Pd nanostructured particles. Decomposition of the solid solution phase occurred at 800–850 °C and resulted in the formation of unusual Pd species, i. e., Pd(Ce)Ox superstructures and agglomerates consisting of 2 nm PdO particles. Further calcination of the catalysts resulted in the formation of mixed Pd0−PdO−CeO2 nanoparticles with a heterophase morphology that provided high thermal stability. These catalysts demonstrated capability for CO oxidation at temperatures below 100 °C after calcination at 1200 °C.

Язык оригиналаанглийский
Страницы (с-по)3505-3521
Число страниц17
ЖурналChemCatChem
Том11
Номер выпуска15
DOI
СостояниеОпубликовано - 7 авг 2019
Опубликовано для внешнего пользованияДа

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