Highly water-dispersible magnetite-supported Pd nanoparticles and single atoms as excellent catalysts for Suzuki and hydrogenation reactions

Guarnizo, Anderson; Angurell, Inmaculada; Muller, Guillermo; Llorca, Jordi; Seco, Miquel; Rossell, Oriol; Rossell, Marta D.

doi:10.1039/c6ra14257e

Cited by 19 publications

(9 citation statements)

References 65 publications

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“…142,143 While FeO x -supported Pd ADCs showed no activity in the hydrogenation of alkynes and alkenes, Pd ADCs on Fe 3 O 4 exhibited high activity in the hydrogenation of nitroaromatics. 146 The difference clearly implies that the hydrogenation of CC and nitro groups follows different mechanisms over oxide-supported Pd ADCs. In the selective hydrogenation of 3-nitrostyrene, FeO x -and silica-supported Pt ADCs exhibited excellent catalytic activity and selectivity to only hydrogenate the nitro group.…”

Section: Importance Of Coordination Structure and Oxidation Statementioning

confidence: 99%

Surface Coordination Chemistry of Atomically Dispersed Metal Catalysts

et al. 2020

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Atomically dispersed metal catalysts (ADCs), as an emerging class of heterogeneous catalysts, have been widely investigated during the past two decades. The atomic dispersion nature of the catalytic metal centers makes them an ideal system for bridging homogeneous and heterogeneous metal catalysts. The recent rapid development of new synthetic strategies has led to the explosive growth of ADCs with a wide spectrum of metal atoms dispersed on supports of different chemical compositions and natures. The availability of diverse ADCs creates a powerful materials platform for investigating mechanisms of complicated heterogeneous catalysis at the atomic levels. Considering most dispersed metal atoms on ADCs are coordinated by the donors from supports, this review will demonstrate how the surface coordination chemistry plays an important role in determining the catalytic performance of ADCs. This review will start from the link between coordination chemistry and heterogeneous catalysis. After the brief description on the advantages and limitations of common structure characterization methods in determining the coordination structure of ADCs, the surface coordination chemistry of ADCs on different types of supports will be discussed. We will mainly illustrate how the local and vicinal coordination species on different support systems act together with the dispersed catalytic metal center to determine the catalytic activity, selectivity, and stability of ADCs. The dynamic coordination structure change of ADCs in catalysis will be highlighted. At the end of the review, personal perspectives on the further development of the field of ADCs will be provided.

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Section: Importance Of Coordination Structure and Oxidation Statementioning

confidence: 99%

Surface Coordination Chemistry of Atomically Dispersed Metal Catalysts

et al. 2020

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“…Few publications discussed in this section present any clue about the potential mechanism of the reaction. Those publications that do report mechanistic details relate to supported‐catalyst systems and present the results of hot‐filtration tests,,, or three‐phase tests or they discuss the sizes of the nanoparticles observed . Two publications also discuss the nature of the active species as being nanoparticles or molecular palladium in solution …”

Section: Suzuki–miyaura Cross‐couplingmentioning

confidence: 99%

Recent Advances in Palladium‐Catalyzed Cross‐Coupling Reactions at ppm to ppb Molar Catalyst Loadings

2017

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We review here new developments in decreasing the catalyst loadings in palladium-catalyzed C-C bond-formation reactions to mol ppm or mol ppb levels.T his decreasest he cost of the catalyst and the toxicity of the reactions ystem, making the reactionm ore attractive to industry.T he Heck reaction, Sonogashira reaction, Suzuki-Miyaurac rosscoupling reaction, other cross-coupling reactions,a nd allylic arylation reactions are separately discussedt o show clearly the progress made in each type of reaction. Apart from the catalyst loading, the other parameters of the reaction( temperature,s olvent, etc.) are brieflyd iscussed to illustrate the shift toward greenerc onditions.F or most reactions,t his shift is underway or wella dvanced, andc atalyst loadings have been decreasedt ob elow 1mol ppm. An abundance of catalytic systems are now available,a nd it is sometimes difficult to identify the best one,b ecause the substratese xamined can vary widely from publication to publication.I nt he future,e mphasis should be placed on the studyingt he full scope of the reaction at mol ppm catalyst loadings,r athert han examining af ew examples at these levels during the reaction-optimization process.1I ntroduction 2M izoroki-Heck Coupling 3S onogashira Coupling 4S uzuki-MiyauraCross-Coupling 5O ther Cross-Coupling Reactions 6A llylic Arylation 7C onclusions

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“…Recent discoveries revealed the potential of palladium nanoparticles (PdNPs) in catalysis, , which might provide an alternative approach to overcome the drawbacks mentioned above. Thus, various types of materials have been used for the immobilization of PdNPs and their subsequent application in catalysis: mesoporous silica or titanium, polymer supports, magnetic nanoparticles, carbon nanotubes, and metal organic frameworks, to mention only a few. − By tuning morphology, shape, and size of the PdNPs, tailored heterogeneous catalytic systems can be designed. , Therefore, the method for the formation of the PdNPs is a crucial step for the design of such heterogeneous catalytic systems with desired properties. Not surprisingly, many procedures for the preparation of PdNPs are described in the literature, and more often than not, they require sophisticated reducing steps, are energy-inefficient, or do not allow precise control over particle size distribution …”

Section: Introductionmentioning

confidence: 99%

Lipidic Mesophase-Embedded Palladium Nanoparticles: Synthesis and Tunable Catalysts in Suzuki–Miyaura Cross-Coupling Reactions

et al. 2018

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Lipidic cubic phases (LCPs) can reduce Pd2+ salts to palladium nanoparticles (PdNPs) of ∼5 nm size in their confined water channels under mild conditions. The resulting PdNP-containing LCPs were used as nanoreactor scaffolds to catalyze Suzuki–Miyaura cross-coupling reactions in the aqueous channels of the mesophase. To turn on catalysis, PdNP-containing LCPs were activated by swelling the aqueous channels of the lipidic framework, thereby enabling diffusion of the water-soluble substrates to the catalysts. The mesophases play a threefold role: they act as reducing agents for Pd2+, as limiting templates for their growth, and as support. The system was characterized and investigated by small-angle X-ray scattering (SAXS), cryo-transmission electron microscopy, dynamic light scattering, and nuclear magnetic resonance. Bulk LCPs and three dispersed palladium/lipid hybrid nanoparticle types were applied in the catalysis. The latterliposomes, hexosomes, and cubosomescan be obtained by design through combination of lipids and additives. The Suzuki–Miyaura cross-coupling of 5-iodo-2′-deoxyuridine and phenylboronic acid was used as a model reaction to study these systems. Bulk Pd-LCPs deliver the Suzuki–Miyaura product in 24 h in conversions up to 98% at room temperature, whereas with palladium/lipid dispersions at 40 °C, 68% of the starting material was transformed to the product after 72 h.

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Highly water-dispersible magnetite-supported Pd nanoparticles and single atoms as excellent catalysts for Suzuki and hydrogenation reactions

Cited by 19 publications

References 65 publications

Surface Coordination Chemistry of Atomically Dispersed Metal Catalysts

Surface Coordination Chemistry of Atomically Dispersed Metal Catalysts

Recent Advances in Palladium‐Catalyzed Cross‐Coupling Reactions at ppm to ppb Molar Catalyst Loadings

Lipidic Mesophase-Embedded Palladium Nanoparticles: Synthesis and Tunable Catalysts in Suzuki–Miyaura Cross-Coupling Reactions

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