Palladium nanoparticles encapsulated in a dendrimer networks as catalysts for the hydrogenation of unsaturated hydrocarbons

Караханов, Э. А.; Максимов, А. Л.; Zakharian, Elena M.; Kardasheva, Yu. S.; Savilov, S. V.; Truhmanova, N. I.; Иванов, А. Л.; Винокуров, В. А.

doi:10.1016/j.molcata.2014.10.018

Cited by 27 publications

(11 citation statements)

References 26 publications

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“…These results indicated that Pd(0) nanoparticles were formed during the Suzuki‐Miyaura coupling reaction, similarly as it was observed in other immobilized palladium catalysts . Moreover, compared with the MPA, the binding energies of N 1s and O 1s of Pd/MPA were both shifted to positive direction (see Figure ), which indicated the coordination of Pd with N and O atoms of polyamide …”

Section: Resultssupporting

confidence: 75%

Pd immobilized on polyamide based on melamine and terephalic acid as an efficient and recyclable catalyst for Suzuki‐Miyaura coupling reaction

Chen

Sun

et al. 2017

Applied Organom Chemis

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A simple synthetic strategy of polyamide was described from melamine and terephalic acid via one‐step polycondensation. PdCl2 was then immobilized on the polyamide (denoted as Pd/MPA). Melamine and terephalic acid not only acted as monomers but also provided the ligand sites to help the polyamide to coordinate with Pd(II). The Pd/MPA catalyst was characterized by FT‐IR, TGA, SEM, TEM, XPS, N2 adsorption‐desorption and atomic absorption spectroscopy. The catalyst was used in Suzuki‐Miyaura coupling reaction of various aryl halides, including less reactive chlorobenzene and benzyl chloride, to give the coupling products in moderate to excellent yields. High turnover frequencies (TOF) up to 29400 h‐1 can be also obtained. In addition, it behaved truly as a heterogeneous catalyst with high reusability after being recycled 6 times and palladium leaching was negligible during the process. This work provides a practical polyamide support to develop heterogeneous palladium catalysts with simple synthetic procedure and low cost.

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Section: Resultssupporting

confidence: 75%

Pd immobilized on polyamide based on melamine and terephalic acid as an efficient and recyclable catalyst for Suzuki‐Miyaura coupling reaction

Chen

Sun

et al. 2017

Applied Organom Chemis

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“…Despite the high activity of noble metals such as Pt and Pd at lower temperatures, the selecting of some metals as nickel, cobalt and tungsten, which because of electronic structure similarity, have analogous performance in comparison to precious metals in their group and also reasonable cost is more attractive in various industries ,. On the other hand, the use of the supports (alone or composite) is very common in order to prevent the metal nanoparticles sintering at high temperatures and increase the active phase dispersion to achieve more activity and stability . Many supports which have the different surface area and pore volume, including zeolites, metal oxides and carbon‐based materials, have been reported for this reaction.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance and Kinetics Study over Novel Ni/Activated Carbon‐FSM‐16 Catalysts in the BTX Mixture for Benzene Selective Hydrogenation

2018

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Nickel catalysts supported on activated carbon/FSM-16 nanoparticles were prepared by wet impregnation method and tested for vapor phase selective hydrogenation of benzene in the mixture of aromatics as benzene, toluene and xylene. The textural and physico-chemical properties of nickel catalysts were characterized by X-ray diffraction, X-ray fluorescence, Fourier transform infrared spectroscopy, Uv-visible diffuse reflectance spectra, field emission scanning electron micro-scope and nitrogen adsorption-desorption analysis. The catalytic evaluation revealed that the best activity (> 94%) and high selectivity (> 99%) are related to Ni/ACÀ F(50) at 150°C and Ni/ ACÀ F(75) at 130°C and 150°C, respectively. In summary, by calculating the yield of benzene, in order to evaluate the performance (activity, stability, and selectivity) of the catalysts, it was found that the performance of Ni/ACÀ F(75) is very appropriate.

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“…The main advantages for dendrimer application in catalysis are: (1) the possibility to sorb a well-defined quantity of metal through the coordination by donor node and end groups [ 10 , 26 , 60 , 62 , 70 , 81 , 82 , 83 , 91 , 93 , 115 ]; (2) the control of substrate selectivity via choice of the dendrimer appropriate generation [ 25 , 26 , 60 , 92 , 93 , 116 , 117 , 118 ] and/or by terminal group modification, specifying the dendrimer solubility in the reaction medium and substrate affinity [ 25 , 60 , 62 , 73 , 80 , 90 , 92 , 93 , 116 , 117 , 118 ]; (3) the recyclability of dendrimer-based catalysts via fractional precipitation from solution or separation to another phase by the addition of appropriate, so-called “bad” solvents [ 60 , 89 , 93 , 108 , 115 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 ], or cooling the reaction mixture below upper critical solution temperature (UCST) or heating above low critical solution tempe...…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Dendrimer-Based Catalysts

2022

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The present review compiles the advances in the dendritic catalysis within the last two decades, in particular concerning heterogeneous dendrimer-based catalysts and their and application in various processes, such as hydrogenation, oxidation, cross-coupling reactions, etc. There are considered three main approaches to the synthesis of immobilized heterogeneous dendrimer-based catalysts: (1) impregnation/adsorption on silica or carbon carriers; (2) dendrimer covalent grafting to various supports (silica, polystyrene, carbon nanotubes, porous aromatic frameworks, etc.), which may be performed in a divergent (as a gradual dendron growth on the support) or convergent way (as a grafting of whole dendrimer to the support); and (3) dendrimer cross-linking, using transition metal ions (resulting in coordination polymer networks) or bifunctional organic linkers, whose size, polarity, and rigidity define the properties of the resulted material. Additionally, magnetically separable dendritic catalysts, which can be synthesized using the three above-mentioned approaches, are also considered. Dendritic catalysts, synthesized in such ways, can be stored as powders and be easily separated from the reaction medium by filtration/centrifugation as traditional heterogeneous catalysts, maintaining efficiency as for homogeneous dendritic catalysts.

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Palladium nanoparticles encapsulated in a dendrimer networks as catalysts for the hydrogenation of unsaturated hydrocarbons

Cited by 27 publications

References 26 publications

Pd immobilized on polyamide based on melamine and terephalic acid as an efficient and recyclable catalyst for Suzuki‐Miyaura coupling reaction

Pd immobilized on polyamide based on melamine and terephalic acid as an efficient and recyclable catalyst for Suzuki‐Miyaura coupling reaction

Catalytic Performance and Kinetics Study over Novel Ni/Activated Carbon‐FSM‐16 Catalysts in the BTX Mixture for Benzene Selective Hydrogenation

Heterogeneous Dendrimer-Based Catalysts

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