Investigation of the Redispersion of Pt Nanoparticles on Polyhedral Ceria Nanoparticles

Wu, Tonghao; Pan, Xiqiang; Zhang, Hongjie; Miao, Zhenzhen; Zhang, Bin; Li, Jingwei; Yang, Xiaojing

doi:10.1021/jz500839u

Cited by 49 publications

(43 citation statements)

References 33 publications

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“…4). Pt 2+ -4O is the most robust state, in agreement with the ionic nature identified in experiments 21,28 , and breaking this coordination by removing an oxygen is very endothermic (~1.84 eV). Thus, Pt 2+ -4O is the resting state of the material under most conditions (in particular, under the oxidative preparation route from the metal nanoparticles that results in PtO 2 volatilization and deposition).…”

supporting

confidence: 82%

Dynamic charge and oxidation state of Pt/CeO2 single-atom catalysts

2019

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The catalytic activity of metals supported on oxides depends on their charge and oxidation state. Yet, the determination of the degree of charge transfer at the interface remains elusive. Here, by combining density functional theory and first-principles molecular dynamics on Pt single atoms deposited on the CeO 2 (100) surface, we show that the common representation of a static metal charge is oversimplified. Instead, we identify several well-defined charge states that are dynamically interconnected and thus coexist. The origin of this new class of strong metal-support interactions is the relative position of the Ce(4f) levels with respect to those of the noble metal, allowing electron injection to (or recovery from) the support. This process is phonon-assisted, as the Ce(4f) levels adjust by surface atom displacement, and appears for other metals (Ni) and supports (TiO 2 ). Our dynamic model explains the unique reactivity found for activated single Pt atoms on ceria able to perform CO oxidation, meeting the Department of Energy 150 °C challenge for emissions.

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supporting

confidence: 82%

Dynamic charge and oxidation state of Pt/CeO2 single-atom catalysts

2019

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“…The Pt NPs were well dispersed and remained nearly unchanged aer supporting on the Ce 1Àx Bi x O 2Àd samples via the conventional wet impregnation method (Fig. 26 The proportion of the larger particles that were more than 3.5 nm was increased, which was perhaps caused by the interaction between the Pt NPs and the support or some of the small Pt particles in the pores of the support. Two lattice fringes of 0.23 nm and 0.32 nm ascribed to the d spacing values of the {111} planes of Pt and Bi-doped ceria could be seen from the HRTEM result of the Pt/Ce 0.8 Bi 0.2 O 2Àd sample (inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Aerobic oxidation of 5-hydroxymethylfurfural (HMF) effectively catalyzed by a Ce_0.8Bi_0.2O_2−δ supported Pt catalyst at room temperature

Miao

et al. 2015

RSC Adv.

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The oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) was efficiently catalyzed when Pt nanoparticles (NPs) were supported onto a Ce 0.8 Bi 0.2 O 2Àd solid solution. 98% yield of FDCA was achieved within 30 min at room temperature and the catalyst was reused five times without much loss of FDCA selectivity. It is the first report on the oxidation of HMF, an alcohol and an aldehyde, effectively catalyzed by a ceria-based material supported Pt catalyst. The individual properties of the Pt NPs and the ceria-based support were retained and not affected after their combination. The superior oxygen activation ability of the Bi-doped ceria thoroughly changed the performance of the ceria supported Pt catalyst. Pt NPs were responsible for the formation of the Pt-alkoxide intermediate, followed by b-H elimination with the help of hydroxide ions. Bi-containing ceria accelerated the oxygen reduction process because of the presence of a large amount of oxygen vacancies and the cleavage of the peroxide intermediate promoted by bismuth. These specific functions were well incorporated during the catalytic oxidation cycle, leading to the generation of the highly efficient Pt/Ce 0.8 Bi 0.2 O 2Àd catalyst for HMF oxidation at room temperature.Scheme 1 The oxidation of biomass-derived HMF to FDCA.

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Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Zhang

Bals

Tendeloo

2018

Part & Part Syst Charact

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Engineering morphology and size of CeO2‐based nanostructures on a (sub)nanometer scale will greatly influence their performance; this is because of their high oxygen storage capacity and unique redox properties, which allow faster switching of the oxidation state between Ce4+ and Ce3+. Although tremendous research has been carried out on the shape‐controlled synthesis of CeO2, the characterization of these nanostructures at the atomic scale remains a major challenge and the origin of debate. The rapid developments of aberration‐corrected transmission electron microscopy (AC‐TEM) have pushed the resolution below 1 Å, both in TEM and in scanning transmission electron microscopy (STEM) mode. At present, not only morphology and structure, but also composition and electronic structure can be analyzed at an atomic scale, even in 3D. This review summarizes recent significant achievements using TEM/STEM and associated spectroscopic techniques to study CeO2‐based nanostructures and related catalytic phenomena. Recent results have shed light on the understanding of the different mechanisms. The potential and limitations, including future needs of various techniques, are discussed with recommendations to facilitate further developments of new and highly efficient CeO2‐based nanostructures.

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Investigation of the Redispersion of Pt Nanoparticles on Polyhedral Ceria Nanoparticles

Cited by 49 publications

References 33 publications

Dynamic charge and oxidation state of Pt/CeO2 single-atom catalysts

Dynamic charge and oxidation state of Pt/CeO2 single-atom catalysts

Aerobic oxidation of 5-hydroxymethylfurfural (HMF) effectively catalyzed by a Ce_0.8Bi_0.2O_2−δ supported Pt catalyst at room temperature

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

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Investigation of the Redispersion of Pt Nanoparticles on Polyhedral Ceria Nanoparticles

Cited by 49 publications

References 33 publications

Dynamic charge and oxidation state of Pt/CeO2 single-atom catalysts

Dynamic charge and oxidation state of Pt/CeO2 single-atom catalysts

Aerobic oxidation of 5-hydroxymethylfurfural (HMF) effectively catalyzed by a Ce0.8Bi0.2O2−δ supported Pt catalyst at room temperature

Understanding CeO2‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

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Product

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Aerobic oxidation of 5-hydroxymethylfurfural (HMF) effectively catalyzed by a Ce_0.8Bi_0.2O_2−δ supported Pt catalyst at room temperature

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D