Synthesis of palladium colloids within polydimethylsiloxane and their use as catalysts for hydrogenation

Campbell, Dean J.; Miller, Josiah D.; Andersh, Brad

doi:10.1016/j.jcis.2011.04.061

Cited by 9 publications

(10 citation statements)

References 20 publications

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“…This reusability also suggests the chemical stability of COP-220 to organic solvents, dry conditions, and acid/base treatments. Palladium on carbon, a popular heterogeneous palladium catalyst, is known to be pyrophoric especially when it is used on a large scale under air. , COP-220 could be one safe alternative to palladium on carbon for Suzuki coupling.…”

Section: Results and Discussionmentioning

confidence: 99%

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Sustainable Porous Polymer Catalyst for Size-Selective Cross-Coupling Reactions

Kim

Dogan

et al. 2019

ACS Sustainable Chem. Eng.

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A new, high surface area, nanoporous polymer (COP-220) was synthesized using sustainable building blocks, namely, a food coloring dye (erythrosine B) and a commercial alkyne. During the Sonogashira coupling, it is observed that Pd and Cu ions and triphenylphosphine ligands of the catalyst get trapped inside the pores. The remnant synthesis catalyst components were characterized in detail and were tested as a new catalyst for Suzuki–Miyaura coupling reactions. COP-220 showed conversion yields comparable to the commercial homogeneous catalyst Pd(PPh3)2Cl2 with an additional advantage of size-dependent catalytic activity when bulkier substrates were used. COP-220 was highly stable under thermal and chemical treatments and recyclable with no loss of activity. These findings show a clear need for extensive characterization of nanoporous polymers made through cross-coupling reactions and the potential of the trapped catalysts for new catalytic activity without additional loading.

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Section: Results and Discussionmentioning

confidence: 99%

“…Palladium on carbon, a popular heterogeneous palladium catalyst, is known to be pyrophoric especially when it is used on a large scale under air. 52,53 COP-220 could be one safe alternative to palladium on carbon for Suzuki coupling.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Sustainable Porous Polymer Catalyst for Size-Selective Cross-Coupling Reactions

Kim

Dogan

et al. 2019

ACS Sustainable Chem. Eng.

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“…For example, the relationships between the colors of light absorbed by, transmitted through, reflected from, and emitted from objects are relevant in describing the optical properties of molecular, nanoscale, and macroscopic structures. These optical properties have been described in a multitude of papers published in this Journal . − In the demonstrations described herein, laser light is shined into a pigmented, transparent sample. The pigment absorbs some of the laser light, which heats the sample along the laser beam path, producing refractive index changes which cause interference in the transmitted light waves .…”

Section: Introductionmentioning

confidence: 96%

Using Polymers and Pigments to Produce Laser Interference Rings

et al. 2019

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When a laser of sufficient intensity is shined into a pigmented transparent medium, the partially absorbed laser light can heat and change the refractive index of the medium in the path of the beam. This altered medium will in turn cause the transmitted laser light to thermally defocus into a series of concentric rings. Some solvents such as 2-propanol and a variety of polymers such as polystyrene, polyethylene terephthalate, and polydimethylsiloxane can be pigmented with a variety of colors. Samples of various colors can be used to spectacularly demonstrate characteristics of light absorption. For example, a 2-propanol solution containing methyl red in red acidic form will absorb a green laser and produce interference rings, but a solution of methyl red in yellow basic form will not. As another example, a red laser beam will pass unaffected through a red pigmented film, but the beam will heat a green film (e.g., from a green pigmented polyethylene terephthalate soda bottle) to produce interference rings. Additionally, since the pattern produced is based on the interference of light waves, these demonstrations reinforce concepts associated with the wave nature of light.

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“…These NPs present not only a high surface to volume ratio but also different properties than bulk materials, such as surface plasmon resonance, surface-enhanced Raman scattering, variations in the band gap, while keeping high stability [1][2][3][4]. Therefore, noble metal NPs have proved to be suitable materials for biomedical [1,6,10,11], sensoring [3,8,[12][13][14], optoelectronics [15,16], water remediation [5,[17][18][19], catalysis [7,[20][21][22], and food control applications [4].…”

Section: Introductionmentioning

confidence: 99%

“…The development of polymeric nanocomposites has been identified as a promising approach to overcome these drawbacks. Incorporating the noble metal NPs into a polymer matrix allows anchoring and stabilizing the NPs, avoiding their aggregation or accidental release, and facilitates their quick recovery [5,10,20,23,[26][27][28][29][30]. However, a proper nanocomposite fabrication route is a key factor for the maintenance of the NPs functionality.…”

Section: Introductionmentioning

confidence: 99%

Melamine Foams Decorated with In-Situ Synthesized Gold and Palladium Nanoparticles

et al. 2020

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A versatile and straightforward route to produce polymer foams with functional surface through their decoration with gold and palladium nanoparticles is proposed. Melamine foams, used as polymeric porous substrates, are first covered with a uniform coating of polydimethylsiloxane, thin enough to assure the preservation of their original porous structure. The polydimethylsiloxane layer allows the facile in-situ formation of metallic Au and Pd nanoparticles with sizes of tens of nanometers directly on the surface of the struts of the foam by the direct immersion of the foams into gold or palladium precursor solutions. The effect of the gold and palladium precursor concentration, as well as the reaction time with the foams, to the amount and sizes of the nanoparticles synthesized on the foams, was studied and the ideal conditions for an optimized functionalization were defined. Gold and palladium contents of about 1 wt.% were achieved, while the nanoparticles were proven to be stably adhered to the foam, avoiding potential risks related to their accidental release.

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Synthesis of palladium colloids within polydimethylsiloxane and their use as catalysts for hydrogenation

Cited by 9 publications

References 20 publications

Sustainable Porous Polymer Catalyst for Size-Selective Cross-Coupling Reactions

Sustainable Porous Polymer Catalyst for Size-Selective Cross-Coupling Reactions

Using Polymers and Pigments to Produce Laser Interference Rings

Melamine Foams Decorated with In-Situ Synthesized Gold and Palladium Nanoparticles

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