Influence of thermal treatment on catalytic performance of Pd/(Ce,Zr)Ox–Al2O3 three-way catalysts

Zhao, Bo; Yang, Chaohe; Wang, Qiuyan; Li, Guangfeng; Zhou, Renxian

doi:10.1016/j.jallcom.2010.01.031

Cited by 51 publications

(18 citation statements)

References 42 publications

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“…Lambrou and Efstathiou [28] investigated the effects of Fe on the oxygen storage and release properties of model Pd-Rh/CeO 2 -Al 2 O 3 TWCs and reported that iron (0.1-0.3 wt%) was deposited on both noble metals (Pd and Rh) and support, causing the development of electronic interactions that influenced the oxidation states of Pd and Rh and enhanced the oxygen chemisorption properties of ceria. In our previous study, we have obtained that Pd-based Ce 0.67 Zr 0.33 O 2 (CZ) prepared by co-precipitated and supercritical drying method exhibits better structural and textural properties and catalytic activity compared with those prepared by other methods [30,31]. In this work, we investigated the effect of iron doping on the physicochemical properties of CZ, oxygen storage/release capacity, the redox behaviour and catalytic performance of Pd-only TWCs using X-ray diffraction (XRD), N 2 adsorption, X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2 -TPR), oxygen storage complete capacity (OSCC), dynamic oxygen storage capacity (DOSC), in situ Raman and catalytic test.…”

Section: Introductionmentioning

confidence: 99%

Effect of iron doping into CeO2–ZrO2 on the properties and catalytic behaviour of Pd-only three-way catalyst for automotive emission control

Wang

Zhao

et al. 2011

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Effect of iron doping into CeO2–ZrO2 on the properties and catalytic behaviour of Pd-only three-way catalyst for automotive emission control

Wang

Zhao

et al. 2011

Journal of Hazardous Materials

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“…The H 2 ‐TPR profiles ( Figure , pretreated at 500 °C) provided the evidence that strong metal–oxide interactions should be also responsible for the abnormal enhancement of catalytic activity. Generally, the peaks below 150 °C (α) related to the reduction of PdO for Pd/CeO 2 catalysts, while the negative peak (β) near 250 °C should be caused by the decomposition of palladium hydride (PdH x ) produced by the chemical absorption of hydrogen by Pd 0 arising from complete reduction of PdO, and the peak (γ) at around 300 to 550 °C should be assigned to the reduction of surface Ce 4+ . In order to facilitate comparison of the ratio of peak intensity, the peak areas of α, β, and γ have been calculated by the integral and listed in Table S3 (Supporting Information).…”

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confidence: 99%

Self‐Assembled Pd@CeO₂/γ‐Al₂O₃ Catalysts with Enhanced Activity for Catalytic Methane Combustion

Feng

Liu

et al. 2017

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Pd@CeO /Al O catalysts are of great importance for real applications, such as three-way catalysis, CO oxidation, and methane combustion. In this article, the Pd@CeO core@shell nanospheres are prepared via the autoredox reaction in aqueous phase. Three kinds of methods are then employed, that is, electrostatic interaction, supramolecular self-assembly, and physical mixing, to support the as-prepared Pd@CeO nanospheres on γ-Al O . A model reaction of catalytic methane-combustion is employed here to evaluate the three Pd@CeO /γ-Al O samples. As a result, the sample Pd@CeO -S-850 prepared via supramolecular self-assembly and calcined at 850 °C exhibits superior catalytic performance to the others, which has a far lower light-off temperature (T of about 364 °C). Moreover, almost no deterioration of Pd@CeO -S-850 is observed after five sequent catalytic cycles. The analysis of H -TPR curves concludes that there exists hydrogen spillover related to the strong metal-support interaction between Pd species and oxides. The strong metal-support interaction and the specific surface areas might be responsible for the catalytic performance of the Pd@CeO samples toward catalytic methane combustion.

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“…Therefore, they are more stable than the larger PdO species. However, the positive signal, designated as peak γ is attributed to the decomposition of the PdHx species formed during the PdO reduction [23]. According to the obtained results (Table 3), the introduction of Zr and Ce on the Pd/SiO 2 catalyst affects the PdOx reducibility.…”

Section: Tprmentioning

confidence: 78%

Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

Sadouki¹,

Fessi²,

Ksibi³

et al. 2018

AMPC

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Aerogel Pd/(Ce 0.33 Zr 0.66 O 2 )SiO 2 catalysts (CeZry) were prepared with variable Ce and Zr loadings (molar ratio Ce/Zr = 1/2) by combining sol-gel and impregnation methods. First, N 2 -physisorption was used to investigate the texture evolution. Then, H 2 -chimisorption and TEM were performed to study the effect on particle dispersion. After, TPR was used to determine the catalyst reducibility. Furthermore, XPS characterization was done to identify the palladium oxidation state and to evaluate the Pd-support interaction. Finally, the prepared catalysts were tested in methane combustion to assess their catalytic activity. The obtained results showed that, when the Zr and Ce loadings are varied between 0% and 8% and between 0% and 6% respectively, the BET surface area was increased from 615 to 744 m 2 /g, the porosity diameter from 45.7 to 83.6 Å, the Pd particle diameter from 5.2 to 7.0 nm, the CeO 2 and ZrO 2 particle size from 0 to 68 nm, the reduction temperature shift reached 16˚C, the Pd binding energy shift attained 0.6 eV, but an optimum amounts of Zr (4 wt.%) and Ce (3 wt.%) are needed to maximize the PdO reducibility and to enhance the catalytic activity. In effect, 100% conversion of methane was reached at around 415˚C on the CeZr4 catalyst.

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Influence of thermal treatment on catalytic performance of Pd/(Ce,Zr)Ox–Al2O3 three-way catalysts

Cited by 51 publications

References 42 publications

Effect of iron doping into CeO2–ZrO2 on the properties and catalytic behaviour of Pd-only three-way catalyst for automotive emission control

Effect of iron doping into CeO2–ZrO2 on the properties and catalytic behaviour of Pd-only three-way catalyst for automotive emission control

Self‐Assembled Pd@CeO₂/γ‐Al₂O₃ Catalysts with Enhanced Activity for Catalytic Methane Combustion

Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

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Influence of thermal treatment on catalytic performance of Pd/(Ce,Zr)Ox–Al2O3 three-way catalysts

Cited by 51 publications

References 42 publications

Effect of iron doping into CeO2–ZrO2 on the properties and catalytic behaviour of Pd-only three-way catalyst for automotive emission control

Effect of iron doping into CeO2–ZrO2 on the properties and catalytic behaviour of Pd-only three-way catalyst for automotive emission control

Self‐Assembled Pd@CeO2/γ‐Al2O3 Catalysts with Enhanced Activity for Catalytic Methane Combustion

Effect of Zirconium and Cerium Loadings on Aerogel Pd-Based Catalysts for Methane Combustion

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Self‐Assembled Pd@CeO₂/γ‐Al₂O₃ Catalysts with Enhanced Activity for Catalytic Methane Combustion