Construction of Active Site in a Sintered Copper–Ceria Nanorod Catalyst

Yu, Wen-Zhu; Wang, Wei-Wei; Li, Shanqing; Fu, Xin-Pu; Wang, Xu; Wu, Ke; Si, Rui; Ma, Chao; Jia, Chun‐Jiang; Yan, Chun‐Hua

doi:10.1021/jacs.9b05419

Cited by 126 publications

(120 citation statements)

References 59 publications

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“…The activation energy of Ce 0.99 Cu 0.01 O 2 support is determined to be 77.60 kJ mol −1 (Supplementary Fig. 15), close to that in previous studies [42][43][44] . The TOF of Pt n /CeCu catalyst reaches 0.26 s −1 at 80°C, which rivals other previously reported Pt/CeO 2 catalysts including Pt single atoms, clusters and nanoparticles (Supplementary Table 1).…”

Section: Resultssupporting

confidence: 86%

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Activation of subnanometric Pt on Cu-modified CeO2 via redox-coupled atomic layer deposition for CO oxidation

et al. 2020

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Improving the low-temperature activity (below 100 °C) and noble-metal efficiency of automotive exhaust catalysts has been a continuous effort to eliminate cold-start emissions, yet great challenges remain. Here we report a strategy to activate the low-temperature performance of Pt catalysts on Cu-modified CeO2 supports based on redox-coupled atomic layer deposition. The interfacial reducibility and structure of composite catalysts have been precisely tuned by oxide doping and accurate control of Pt size. Cu-modified CeO2-supported Pt sub-nanoclusters demonstrate a remarkable performance with an onset of CO oxidation reactivity below room temperature, which is one order of magnitude more active than atomically-dispersed Pt catalysts. The Cu-O-Ce site with activated lattice oxygen anchors deposited Pt sub-nanoclusters, leading to a moderate CO adsorption strength at the interface that facilitates the low-temperature CO oxidation performance.

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Section: Resultssupporting

confidence: 86%

“…18). The appearance of the reduction peak at 242°C for Ce 0.99 Cu 0.01 O 2 support can be assigned to the reduction of Cu-O-Ce species 42,43 . Cu dopants also cause the shift of reduction peaks of surface oxygen (250-550°C) and bulk oxygen (about 710°C) of CeO 2 supports for Pt 1 /Ce and Pt n /Ce to low temperatures.…”

Section: Resultsmentioning

confidence: 93%

Activation of subnanometric Pt on Cu-modified CeO2 via redox-coupled atomic layer deposition for CO oxidation

et al. 2020

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“…In situ DRIFT can also be used to investigate CO adsorption ability on Cu SACs [183] . Atomically dispersed copper species were constructed through calcination in air at 800 °C.…”

Section: Characterization Of Sacsmentioning

confidence: 99%

“…In situ DRIFT can also be used to investigate CO adsorption ability on Cu SACs. [183] Atomically dispersed copper species were constructed through calcination in air at 800°C. The high temperature treated catalysts showed a stronger ability to adsorb CO than low temperature treated catalysts did.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

“…[188] Figure 16. In situ DRIFTS spectra of 1CuCe-800 and 1CuCe-400 in (a) CO adsorption condition and (b) CO/O 2 co-adsorption conditions at 120°C, [183] reprinted with permission from ref [183], Copyright 2019 American Chemical Society. (c) FTIR spectra (absorbance) in the ν CO region characterizing supported Ir complexes, [184] reprinted with permission from ref [184], Copyright 2011 American Chemical Society.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

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Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure

Wang

Liu

2020

ChemCatChem

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Single‐atom catalysts (SACs) have been rising recently as a new frontier in the catalysis field. Due to maximum atom utilization efficiency and tunable electronic structures, SACs exhibit highly distinctive catalytic performance from bulk counterparts. SACs with high metal loading will facilitate practical applications. To that end, this Review focuses on recent strategies to maximize metal loading. An appropriate substrate, mainly heteroatom‐doped carbon materials, is the key to avoiding aggregation or sintering during synthetic procedures. The coordination site construction and spatial confinement strategies are adopted to prepare SACs with high metal loading. Advanced characterization techniques with atomic resolution are indispensable for identification of the exact structure of SACs. This is true, especially for the applications and challenges in developing in situ/operando characterization techniques at the atomic level, which are discussed in this Review. Moreover, it is fundamentally necessary to investigate the active center structure, which facilitates any design of efficient SACs that can maximize single‐atom catalytic activity. Furthermore, this Review highlights challenges and prospects for development of SACs.

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Supported Metal Single‐Atom Thermocatalysts for Oxidation Reactions

Piccolo

Loridant

Christopher

2022

Supported Metal Single Atom Catalysis

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The interest in single-metal-atom dispersion in heterogeneous catalysis has existed since the 1950s with spectroscopic investigations of rhodium "single-site" catalysts supported on alumina, and more recently with oxometallate monomers for selective oxidation reactions. A decade ago, advances in electron microscopy intensified the interest of the catalysis community in controlling the dispersion of supported metals down to the single-atom active site level and revealing their intrinsic catalytic properties. Pioneering works in the ever-growing field of single-atom catalysis investigated late transition metals (group 8 to 11) supported on transition metal oxides for the CO oxidation and water-gas shift reactions. Since then, various single-atom catalysts, most often supported on oxides, have been evaluated in a broad panel of thermal oxidation reactions, and have often shown remarkable performances. Besides CO oxidation over oxidesupported noble metals, which represents the major part of the literature, this chapter reviews the main classes of oxidation reactions, including total and selective oxidations of hydrocarbons and oxygenates, on 2 oxide-or carbon-supported catalysts. Throughout the chapter, we emphasize several aspects that we consider important, such as the coordination environment and stability of single metal atoms, as well as their compared performance with supported nanoparticles. Figure 3. a) Aberration-corrected STEM image of Pt atoms (identified by yellow circles) on ca. 5 nm diameter anatase TiO2 particles. Adapted with permission from [72], Copyright 2017 ACS. b) CO probemolecule FTIR spectra of a Pt/TiO2 SAC as a function of temperature during a TPD measurement. c) DFT-calculated structure of CO bound to PtO2 adsorbed at a TiO2(145) step edge. b and c adapted with permission from [73], Copyright 2018 Elsevier. d) Schematic showing the structural transformation of isolated Pt species as a function of environmental conditions. Adapted with permission from [74],Copyright 2019 Springer Nature. e) DFT-calculated reaction pathway for CO oxidation on a Pd/TiO2 SAC that was supported by spectroscopic and kinetic analyses. Adapted with permission from [75],

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Construction of Active Site in a Sintered Copper–Ceria Nanorod Catalyst

Cited by 126 publications

References 59 publications

Activation of subnanometric Pt on Cu-modified CeO2 via redox-coupled atomic layer deposition for CO oxidation

Activation of subnanometric Pt on Cu-modified CeO2 via redox-coupled atomic layer deposition for CO oxidation

Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure

Supported Metal Single‐Atom Thermocatalysts for Oxidation Reactions

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