Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Thermally Induced Structural Evolution of Palladium-Ceria Catalysts. Implication for CO Oxidation. / Stonkus, Olga A.; Kardash, Tatyana Yu; Slavinskaya, Elena M. и др.
в: ChemCatChem, Том 11, № 15, 07.08.2019, стр. 3505-3521.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Thermally Induced Structural Evolution of Palladium-Ceria Catalysts. Implication for CO Oxidation
AU - Stonkus, Olga A.
AU - Kardash, Tatyana Yu
AU - Slavinskaya, Elena M.
AU - Zaikovskii, Vladimir I.
AU - Boronin, Andrei I.
N1 - Publisher Copyright: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2019/8/7
Y1 - 2019/8/7
N2 - 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.
AB - 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.
KW - cerium oxide
KW - CO oxidation
KW - Nanoparticles
KW - Palladium
KW - Structure-activity relationships
KW - METAL-SUPPORT INTERACTION
KW - ATOMICALLY DISPERSED PD
KW - LOCAL-STRUCTURE
KW - HYDROGEN PROX
KW - LOW-TEMPERATURE OXIDATION
KW - PD/CEO2 CATALYSTS
KW - SOLID-SOLUTION
KW - CATALYTIC-PROPERTIES
KW - CARBON-MONOXIDE
KW - OXIDIZED PALLADIUM
UR - http://www.scopus.com/inward/record.url?scp=85068511759&partnerID=8YFLogxK
U2 - 10.1002/cctc.201900752
DO - 10.1002/cctc.201900752
M3 - Article
AN - SCOPUS:85068511759
VL - 11
SP - 3505
EP - 3521
JO - ChemCatChem
JF - ChemCatChem
SN - 1867-3880
IS - 15
ER -
ID: 23692149