The Role of Palladium Dynamics in the Surface Catalysis of Coupling Reactions

Shao, Lei; Zhang, Bingsen; Zhang, Wei; Hong, Sung You; Schlögl, Robert; Su, Dang Sheng

doi:10.1002/anie.201207362

Cited by 83 publications

(66 citation statements)

References 38 publications

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“…including XAS [6,7] and STEM/HRTEM imaging [8] techniques. Previously, operando X-ray absorption spectroscopy (XAS) studies have been conducted on Pd catalysts in a Suzuki-Miyaura [6] and closely related Heck reactions: [9] Lee and co-workers employed a reactor cell to recirculate a solution of the catalyst under study (PVP-stabilised Pd nanoparticles) through the path of the X-ray beam during data acquisition.…”

Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

Catalysis in flow: Operando study of Pd catalyst speciation and leaching

et al. 2014

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Highlights: A custom-made plug-flow reactor (PFR) was constructed for examining Pd catalysis  Leaching/reaction profiles of two Pd catalysts for the Suzuki-Miyaura reaction were established by filtration studies.  The PFR was used to examine catalyst activation and deactivation processes  Ethanol was found to affect the catalysts differently  Leaching and speciation of Pd along the catalyst bed has been observed for the very first time. Catal Today (Highlights

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Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

Catalysis in flow: Operando study of Pd catalyst speciation and leaching

et al. 2014

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“…In addition, a moderate yield of isolated product of up to 80 % was obtained by using a THF/water mixed solvent system to increase the solubility of the starting reactants (Figure 3, c). Presumably, the lack of efficient supporting materials blocks the sufficiently close contact of reactant molecules to catalysts, which limits any further increases in the yield 16. Moreover, the individual compound 2 was found to self‐assemble to closed vesicular structures (Figures S12 and S13), which showed a significantly lower conversion ratio than Pd@NT (Figure 3, d).…”

Section: Methodsmentioning

confidence: 99%

A Supramolecular Tubular Nanoreactor

Zhang

Chen

et al. 2014

Chemistry A European J

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The extremely strong noncovalent complexation between the rigid host of phthalocyanine-bridged β-cyclodextrins and the amphiphilic guest carboxylated porphyrin is employed to construct a hollow tubular structure as a supramolecular nanoreactor. A representative coupling reaction occurs in the hydrophobic interlayers of the tubular walls in pure water at room temperature, leading to an enhancement of ten times higher reaction rate without any adverse effect on catalytic activity and conversion.

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“…further studied the influence of the chemical properties of functionalized CNT materials on Pd dynamics. CNTs were processed to different degrees before being immobilized with Pd NPs for use in Suzuki reactions . Graphitized CNTs prepared at different temperatures were treated with concentrated nitric acid to obtain high functionalization (H‐CNTs) on defective CNTs and low functionalization (L‐CNTs) on graphitized CNTs.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Carbon‐Based Material‐Supported Palladium Nanocatalysts in Coupling Reactions: Discussion on their Stability and Heterogeneity

Zhao

Cao

2020

Applied Organom Chemis

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Scientific interest in carbon‐based materials (CBMs) has grown dramatically over the past few decades. Due to a variety of atomic orbital hybrid forms (sp, sp2 and sp3 hybridization), carbon can form a variety of materials with diverse structures and characteristics. CBMs used as efficient catalyst supports show extensive promise in organic reactions, which is attributed to their structural similarity with organics, large specific surface area, chemical stability, and photocatalytic properties. This review presents the synthesis of CBM‐supported palladium nanocatalysts based on impregnation, template methods, etc. The CBMs include activated carbon (AC), graphene, carbon nanotubes (CNTs), and their functionalized products, as supports for improving the activity and recyclability of simple Pd nanocatalysts. After surveying the literature where these catalysts have been utilized for carbon–carbon coupling reactions, there is a particular emphasis on Suzuki, Heck, and Sonogashira reactions. The catalytic mechanism of these Pd nanocatalysts (surface heterogeneous catalysis or homogeneous catalysis caused by Pd leaching) is discussed in detail, especially the effect of Pd leaching on the stability of the catalyst.

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The Role of Palladium Dynamics in the Surface Catalysis of Coupling Reactions

Cited by 83 publications

References 38 publications

Catalysis in flow: Operando study of Pd catalyst speciation and leaching

Catalysis in flow: Operando study of Pd catalyst speciation and leaching

A Supramolecular Tubular Nanoreactor

Carbon‐Based Material‐Supported Palladium Nanocatalysts in Coupling Reactions: Discussion on their Stability and Heterogeneity

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