A General One‐Pot Methodology for the Preparation of Mono‐ and Bimetallic Nanoparticles Supported on Carbon Nanotubes: Application in the Semi‐hydrogenation of Alkynes and Acetylene

Lomelí-Rosales, Diego Alberto; Delgado, Jorge A.; Bernardos, Miriam Díaz de los; Pérez-Rodríguez, S.; Gual, Aitor; Claver, Carmen; Godard, Cyril

doi:10.1002/chem.201901041

Cited by 31 publications

(22 citation statements)

References 48 publications

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“…In conclusion, the introduction of Cu in the Pd structure to form a nanoalloy promotes the alkene selectivity by preventing over‐hydrogenation and isomerisation processes. This observation is in agreement with a previous report where the alloying of Pd with Cu lower the hydrogenation activity and as such helps preventing overhydrogenation [7a] . It is important to highlight, that due to the structure sensitivity of the hydrogenation of alkynes, the particle size of the M‐NPs may affect the activity of a catalyst, and that the particle size is also highly influenced by the nature of the support.…”

Section: Resultssupporting

confidence: 92%

“…The impact of such a dilution can be attributed to electronic or geometric effects [10] . In this regard, palladium based bimetallic formulations such as PdAg, [11] and PdAu, [12] PdPt, [12a] PdRhP, [13] PdB, [14] PdCu [7a,11a,15] among others were reported in this reaction. In particular, bimetallic PdCu formulations have experienced special interest by the scientific community during the last years.…”

Section: Introductionmentioning

confidence: 99%

“…In our group, recently, a straightforward methodology was reported for the preparation of monometallic (copper and palladium) and bimetallic nanocatalysts (NiCu and PdCu) stabilized by a N‐heterocyclic carbene ligand [7a] . Both colloidal and supported nanoparticles (NPs) on carbon nanotubes (CNTs) were prepared via a one‐pot synthesis with outstanding control on their size, morphology and composition.…”

Section: Introductionmentioning

confidence: 99%

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Pd, Cu and Bimetallic PdCu NPs Supported on CNTs and Phosphine‐Functionalized Silica: One‐Pot Preparation, Characterization and Testing in the Semi‐Hydrogenation of Alkynes

et al. 2021

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Triphenylphosphine stabilized Pd, Cu and PdCu nanocatalysts supported on carbon nanotubes (CNTs) or phosphorus functionalised silica (P−SiO2) were prepared via a one‐pot methodology. The series of P−SiO2 supported catalysts evidenced metal particle sizes of metallic nanoparticles (M‐NPs) between 1 and 2.4 nm, smaller than their equivalents on CNTs (2.4–2.6 nm). Such a difference in particle size as a function of the support and the metallic composition indicated the more pronounced mediation of the CNTs support during the formation of the M‐NPs when compared to the P−SiO2 support. The series of supported catalysts were tested in the semi‐hydrogenation of alkynes providing differences in reactivity which might be correlated with the size and composition of the M‐NPs and the nature of corresponding support. The carbon supported catalysts displayed in general higher activities than those supported on silica and the bimetallic catalyst PdCu/CNTs were the most selective for the case of alkyl substituted alkynes. This catalyst could moreover be recycled several times without loss of activity nor selectivity.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pd, Cu and Bimetallic PdCu NPs Supported on CNTs and Phosphine‐Functionalized Silica: One‐Pot Preparation, Characterization and Testing in the Semi‐Hydrogenation of Alkynes

et al. 2021

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“…This method has already been extended to the preparation of colloidal and carbon-supported single-metal Cu catalysts, whose catalytic performance is much higher than that of ordinary acetylene semihydrogenation catalysts. 45 Besides, constructing Pd intermetallic to make the continuous Pd ensembles separated or even totally isolated can largely enhance the hydrogenation selectivity. Single-atom alloy (SAA) catalysts are promising candidates for selective hydrogenation because the active metal atoms are exclusively surrounded by the second metal atoms at proper compositions and the interaction between each component leads to high thermal stability and structural integrity under reaction conditions.…”

Section: Advantages Of Pd-based Catalysts and The Factors Influencing Their Catalytic Performancementioning

confidence: 99%

Recent Progress in Pd-Based Nanocatalysts for Selective Hydrogenation

et al. 2021

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Selective hydrogenation plays an important role in the chemical industry and has a wide range of applications, including the production of fine chemicals and petrochemicals, pharmaceutical synthesis, healthcare product development, and the synthesis of agrochemicals. Pd-based catalysts have been widely applied for selective hydrogenation due to their unique electronic structure and ability to adsorb and activate hydrogen and unsaturated substrates. However, the exclusive and comprehensive summarization of the size, composition, and surface and interface effect of metal Pd on the performance for selective hydrogenation is still lacking. In this perspective, the research progress on selective hydrogenation using Pd-based catalysts is summarized. The strategies for improving the catalytic hydrogenation performance over Pd-based catalysts are investigated. Specifically, the effects of the size, composition, and surface and interfacial structure of Pd-based catalysts, which could influence the dissociation mode of hydrogen, the adsorption, and the reaction mode of the catalytic substrate, on the performance have been systemically reviewed. Then, the progress on Pd-based catalysts for selective hydrogenation of unsaturated alkynes, aldehydes, ketones, and nitroaromatic hydrocarbons is revealed based on the fundamental principles of selective hydrogenation. Finally, perspectives on the further development of strategies for chemical selective hydrogenation are provided. It is hoped that this perspective would provide an instructive guideline for constructing efficient heterogeneous Pd-based catalysts for various selective hydrogenation reactions.

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“…Highly mono-disperse particle size distributions were reported for Cu and CuZnOx colloids. [81][82][83] However, removal of the ligands often leads to particle growth and large scale use in catalysis is limited, with only few examples of industrial application.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Carbon-Supported Copper for Gas-Phase Hydrogenation Catalysis

Beerthuis¹

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as Pb, S, or quinoline (Lindlar catalyst) 161 , has been reported to increase the selectivity, albeit at lower overall activity, by avoiding the presence of extended Pd surfaces. 144 Interestingly, supported Cu catalysts have been reported to be highly selective for the hydrogenation of various alkynes [162][163][164][165][166] and dienes. [75][76][167][168][169][170] Nevertheless, the Cu catalysts in literature consistently showed poor stability, resulting in catalyst deactivation within several hours on stream. In our group, Masoud et al. recently showed that the support can have a major effect on the stability of supported Au catalysts for the hydrogenation of butadiene. 171 Significantly higher stability was observed when using SiO2 compared to TiO2, due to reduced oligomer formation on the support surface. Using carbon or SiO2 as an inert support for monometallic Cu may provide relatively stable catalysts. In Chapter 6, we discuss the catalytic performance of monometallic Cu on carbon for the gas-phase hydrogenation of butadiene at atmospheric pressure, as a model reaction for selective hydrogenation catalysis (Eq. 1.5).

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A General One‐Pot Methodology for the Preparation of Mono‐ and Bimetallic Nanoparticles Supported on Carbon Nanotubes: Application in the Semi‐hydrogenation of Alkynes and Acetylene

Cited by 31 publications

References 48 publications

Pd, Cu and Bimetallic PdCu NPs Supported on CNTs and Phosphine‐Functionalized Silica: One‐Pot Preparation, Characterization and Testing in the Semi‐Hydrogenation of Alkynes

Pd, Cu and Bimetallic PdCu NPs Supported on CNTs and Phosphine‐Functionalized Silica: One‐Pot Preparation, Characterization and Testing in the Semi‐Hydrogenation of Alkynes

Recent Progress in Pd-Based Nanocatalysts for Selective Hydrogenation

Carbon-Supported Copper for Gas-Phase Hydrogenation Catalysis

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