Thermosensitive and pH-sensitive Au–Pd bimetallic nanocomposites

Zhao, Dongyun; Chen, Xi; Liu, Yang; Wu, Chenglin; Ma, Rujiang; An, Yingli; Shi, Linqi

doi:10.1016/j.jcis.2008.11.041

Cited by 43 publications

(16 citation statements)

References 27 publications

(33 reference statements)

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“…A). This phenomenon follows the typical relation between rate constant and temperature described by Arrhenius equation :

\ln k_{o b s} = - \frac{E_{a}}{R T} + \ln A_{o}

where E a (kJ/mol) is Arrhenius activation energy or apparent activation energy; R is ideal gas constant; A o is pre‐exponential factor (min −1 ). The rate‐limiting step of heterogeneous reaction can be distinguished by studying the effect of temperature on rates.…”

Section: Resultsmentioning

confidence: 60%

“…Noble metal nanoparticles have been continually investigated in the past few years due to their outstanding electronic, optic, catalytic properties, which are greatly different from their bulk materials . Especially, they have outstanding catalyst activity in many organic reactions such as deoxygenation of fatty acids , Heck reaction , formic acid electro‐oxidation , and selective oxidation of organic compounds .…”

Section: Introductionmentioning

confidence: 99%

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Preparation and catalytic properties of composites with palladium nanoparticles and poly(methacrylic acid) microspheres

Chen

et al. 2014

Polymer Composites

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Palladium (Pd) nanoparticles with different sizes are in situ synthesized by reduction of PdCl2 with NaBH4 as reductant in the presence of poly(methacrylic acid) (PMAA)microspheres. The obtained PMAA/Pd composites are characterized by Fourier transform infrared spectra, X‐ray diffraction, and Transmission electron microscopy. The catalytic activity of the PMAA/Pd composites is investigated using a model reaction, that is, reduction of p‐nitrophenol to p‐aminophenol. The reaction shows first‐order kinetics, and the reaction rate increases with increasing reaction temperature, p‐nitrophenol concentration, and loadings of Pd nanoparticles on PMAA microspheres. The PMAA/Pd composites exhibit good stability, ascribing to the Pd nanoparticles stabilized by PMAA microspheres. POLYM. COMPOS., 35:2251–2260, 2014. © 2014 Society of Plastics Engineers

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“…A). This phenomenon follows the typical relation between rate constant and temperature described by Arrhenius equation :

\ln k_{o b s} = - \frac{E_{a}}{R T} + \ln A_{o}

Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic properties of composites with palladium nanoparticles and poly(methacrylic acid) microspheres

Chen

et al. 2014

Polymer Composites

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“…The maximum activity was ~3× higher compared to their monometallic Pd catalyst [23]. A study by Zhao et al on a series of PdAu catalysts synthesized via coreduction showed the same higher activity of the bimetallic catalysts, though maximum activity occurred for the composition of Au:Pd molar ratio of 3:7 (30 mol% Au) [24]. While bulk metal composition can be controlled, the differences in catalysis indicate differences in the bimetal structure.…”

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confidence: 93%

Improving gold catalysis of nitroarene reduction with surface Pd

et al. 2016

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Nitroarene reduction reactions are commercialized catalytic processes that play a key role in the synthesis of many products including medicines, rubbers, dyes, and herbicides. Whereas bimetallic compositions have been studied, a better understanding of the bimetallic structure effects may lead to improved industrial catalysts. In this work, the influence of surface palladium atoms supported on 3-nm Au nanoparticles (Pd-on-Au NPs) on catalytic activity for 4-nitrophenol reduction is explored. Batch reactor studies indicate Pd-on-Au NPs exhibit maximum catalytic activity at a Pd surface coverage of 150 sc%, with an initial turnover frequency of ~3.7 mol-nitrophenol/mol-metal surface /s, which was ~5.5× and ~13× more active than pure Au NPs and Pd NPs, respectively. Pd NPs, Au NPs, and Pd-on-Au NPs below 175 sc% show compensation behavior. Three-dimensional Pd surface ensembles (with ~4-5 atoms) previously identified through x-ray adsorption spectroscopy provide the active sites responsible for the catalytic maximum. These results demonstrate the ability to adjust systematically a structural feature (i.e., Pd surface coverage) to yield a more active material.

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“…Shi's group109 reported a PNIPAM‐ b ‐P4VP block copolymer, which was used to stabilize Au–Pd bimetallic nanoparticles to form a catalyst for the reduction of 4‐NP 1 (Scheme ). The bimetallic nanoparticles were embedded in a core consisting of P4VP and surrounded by a PNIPAM shell.…”

Section: Dual‐responsive Catalytic Systemsmentioning

confidence: 99%

Polymer‐Based Stimuli‐Responsive Recyclable Catalytic Systems for Organic Synthesis

Zhang

Tang

et al. 2013

Small

152

100

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The introduction of stimuli-responsive polymers into the study of organic catalysis leads to the generation of a new kind of polymer-based stimuli-responsive recyclable catalytic system. Owing to their reversible switching properties in response to external stimuli, these systems are capable of improving the mass transports of reactants/products in aqueous solution, modulating the chemical reaction rates, and switching the catalytic process on and off. Furthermore, their stimuli-responsive properties facilitate the separation and recovery of the active catalysts from the reaction mixtures. As a fascinating approach of the controllable catalysis, these stimuli-responsive catalytic systems including thermoresponsive, pH-responsive, chemo-mechano-chemical, ionic strength-responsive, and dual-responsive, are reviewed in terms of their nanoreactors and mechanisms.

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Thermosensitive and pH-sensitive Au–Pd bimetallic nanocomposites

Cited by 43 publications

References 27 publications

Preparation and catalytic properties of composites with palladium nanoparticles and poly(methacrylic acid) microspheres

Preparation and catalytic properties of composites with palladium nanoparticles and poly(methacrylic acid) microspheres

Improving gold catalysis of nitroarene reduction with surface Pd

Polymer‐Based Stimuli‐Responsive Recyclable Catalytic Systems for Organic Synthesis

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