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

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Thermally Induced Structural Evolution of Palladium-Ceria Catalysts. Implication for CO Oxidation. / Stonkus, Olga A.; Kardash, Tatyana Yu; Slavinskaya, Elena M. et al.

In: ChemCatChem, Vol. 11, No. 15, 07.08.2019, p. 3505-3521.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{62ea3f6d51d74b3eb988b8aac6eff359,

title = "Thermally Induced Structural Evolution of Palladium-Ceria Catalysts. Implication for CO Oxidation",

abstract = "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.",

keywords = "cerium oxide, CO oxidation, Nanoparticles, Palladium, Structure-activity relationships, METAL-SUPPORT INTERACTION, ATOMICALLY DISPERSED PD, LOCAL-STRUCTURE, HYDROGEN PROX, LOW-TEMPERATURE OXIDATION, PD/CEO2 CATALYSTS, SOLID-SOLUTION, CATALYTIC-PROPERTIES, CARBON-MONOXIDE, OXIDIZED PALLADIUM",

author = "Stonkus, {Olga A.} and Kardash, {Tatyana Yu} and Slavinskaya, {Elena M.} and Zaikovskii, {Vladimir I.} and Boronin, {Andrei I.}",

year = "2019",

month = aug,

day = "7",

doi = "10.1002/cctc.201900752",

language = "English",

volume = "11",

pages = "3505--3521",

journal = "ChemCatChem",

issn = "1867-3880",

publisher = "Wiley - VCH Verlag GmbH & CO. KGaA",

number = "15",

}

RIS

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.

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