Perspective on CO oxidation over Pd-based catalysts

Zhou, You; Wang, Zongyuan; Liu, Changjun

doi:10.1039/c4cy00983e

Cited by 153 publications

(120 citation statements)

References 62 publications

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“…[ 93 ] A similar conclusion, that the Pd{100} facet has a lower barrier than the {111} or {110} facets, has been reached by other groups. [ 92,94,95 ] Here we have to point out that oxygen activation is not the only key step to CO oxidation. As commonly recognized by the research community, [ 96 ] both CO and O 2 activation are crucial to achieving high-effi ciency CO oxidation.…”

Section: Co Oxidationmentioning

confidence: 97%

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Palladium‐Based Nanomaterials: A Platform to Produce Reactive Oxygen Species for Catalyzing Oxidation Reactions

et al. 2015

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Oxidation reactions by molecular oxygen (O2 ) over palladium (Pd)-based nanomaterials are a series of processes crucial to the synthesis of fine chemicals. In the past decades, investigations of related catalytic materials have mainly been focused on the synthesis of Pd-based nanomaterials from the angle of tailoring their surface structures, compositions and supporting materials, in efforts to improve their activities in organic reactions. From the perspective of rational materials design, it is imperative to address the fundamental issues associated with catalyst performance, one of which should be oxygen activation by Pd-based nanomaterials. Here, the fundamentals that account for the transformation from O2 to reactive oxygen species over Pd, with a focus on singlet O2 and its analogue, are introduced. Methods for detecting and differentiating species are also presented to facilitate future fundamental research. Key factors for tuning the oxygen activation efficiencies of catalytic materials are then outlined, and recent developments in Pd-catalyzed oxygen-related organic reactions are summarized in alignment with each key factor. To close, we discuss the challenges and opportunities for photocatalysis research at this unique intersection as well as the potential impact on other research fields.

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Section: Co Oxidationmentioning

confidence: 97%

“…[ 92 ] For this reason, we fi rst introduce the progress on this reaction, followed by discussions on catalytic organic reactions.…”

Section: Co Oxidationmentioning

confidence: 99%

Palladium‐Based Nanomaterials: A Platform to Produce Reactive Oxygen Species for Catalyzing Oxidation Reactions

et al. 2015

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“…2 Typical catalysts for CO oxidation consist of noble metals, such as Pt, [3][4][5][6][7][8] Pd, 5,6,[9][10][11][12] Ru 13 and Au, [14][15][16][17] and they have been widely investigated for decades. To further increase the catalytic performance and reduce the cost, recent research attention has turned to ''single atom catalysts'' (SACs) 18,19 by downsizing the catalyst to the atomic scale, which provides a platform for the establishment of new fundamental science as well as the design of excellent catalysts.…”

Section: Introductionmentioning

confidence: 99%

A promising single atom catalyst for CO oxidation: Ag on boron vacancies of h-BN sheets

Yang

et al. 2017

Phys. Chem. Chem. Phys.

102

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Single atom catalysts (SACs) have attracted broad research interest in recent years due to their importance in various fields, such as environmental protection and energy conversion. Here, we discuss the mechanisms of CO oxidation to CO 2 over single Ag atoms supported on hexagonal boron-nitride sheets (Ag 1 /BN) through systematic van der Waals inclusive density functional theory (DFT-D)calculations. The Ag adatom can be anchored onto a boron defect (V B ), as suggested by the large energy barrier of 3.12 eV for Ag diffusion away from the V B site. Three possible mechanisms (i.e., Eley-Rideal, Langmuir-Hinshelwood, and termolecular Eley-Rideal) of CO oxidation over Ag 1 /BN are investigated. Due to ''CO-Promoted O 2 Activation'', the termolecular Eley-Rideal (TER) mechanism is the most relevant one for CO oxidation over Ag 1 /BN and the rate-limiting reaction barrier is only 0.33 eV. More importantly, the first principles molecular dynamics simulations confirm that CO oxidation via the TER mechanism may easily occur at room temperature. Analyses with the inclusion of temperature and entropy effects further indicate that the CO oxidation via the TER mechanism over Ag 1 /BN is thermodynamically favorable in a broad range of temperatures.

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“…The coupling of molecularly-mediated synthesis of nanoparticles and post-synthesis thermochemical processing under controlled temperatures and atmospheres have demonstrated effectiveness in the preparation of nanocatalysts. In comparison with other methods such as plasmatic cleaning or chemical cleaning [22], thermochemical processing strategy is not only effective in removing the encapsulation, but also in refining the nanostructural parameters. The combination of the molecular encapsulation based synthesis and thermochemical processing strategies typically involves a sequence of steps for the preparation of nanoalloy catalysts: (1) chemical synthesis of the metal nanocrystal cores capped with ligands, (2) assembly of the encapsulated nanoparticles on supporting materials (e.g., carbon powders, TiO2 or SiO2), and (3) thermal treatment of the supported nanoparticles [12][13][14][15][16][17].…”

Section: Synthesis and Preparationmentioning

confidence: 99%

Nanoscale Alloying in Electrocatalysts

Shan

Kang

et al. 2015

Catalysts

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In electrochemical energy conversion and storage, existing catalysts often contain a high percentage of noble metals such as Pt and Pd. In order to develop low-cost electrocatalysts, one of the effective strategies involves alloying noble metals with other transition metals. This strategy promises not only significant reduction of noble metals but also the tunability for enhanced catalytic activity and stability in comparison with conventional catalysts. In this report, some of the recent approaches to developing alloy catalysts for electrocatalytic oxygen reduction reaction in fuel cells will be highlighted. Selected examples will be also discussed to highlight insights into the structural and electrocatalytic properties of nanoalloy catalysts, which have implications for the design of low-cost, active, and durable catalysts for electrochemical energy production and conversion reactions.

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Perspective on CO oxidation over Pd-based catalysts

Abstract: CO oxidation is one of the most extensively investigated reactions in the field of heterogeneous catalysis because of its importance in both environmental protection and fundamental studies.

Cited by 153 publications

References 62 publications

Palladium‐Based Nanomaterials: A Platform to Produce Reactive Oxygen Species for Catalyzing Oxidation Reactions

Palladium‐Based Nanomaterials: A Platform to Produce Reactive Oxygen Species for Catalyzing Oxidation Reactions

A promising single atom catalyst for CO oxidation: Ag on boron vacancies of h-BN sheets

Nanoscale Alloying in Electrocatalysts

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