Selective catalytic oxidation using supported gold–platinum and palladium–platinum nanoalloys prepared by sol-immobilisation

Peneau, Virginie; He, Qian; Shaw, Greg; Kondrat, Simon A.; Davies, Thomas E.; Miedziak, Peter J.; Forde, Michael M.; Dimitratos, Nikolaos; Kiely, Christopher J.; Hutchings, Graham J.

doi:10.1039/c3cp50361e

Cited by 39 publications

(38 citation statements)

References 25 publications

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“…Previous studies showed that bimetallic nanoparticles are formed as a homogeneous alloy if Au and Pd are reduced simultaneously during the preparation of the catalyst. [21] The fact that the measured Au/Pd surface ratios are close to 1 (Table 3) agrees with this observation. The relative concentration of surface carbon is also displayed in Table 3.…”

Section: Sol_2xpva_ref90supporting

confidence: 84%

“…Such a synergistic effect between Au and Pd has already been observed in other oxidation reactions such as benzyl alcohol oxidation. [21] This phenomenon has been ascribed to Au atoms drawing electron density away from Pd atoms, which thus en- hances the interaction of Pd with the reactants. [22] In relation to product distribution, Au nanoparticles gave the highest selectivity towards butyl butyrate, which is formed from the esterification of n-butanol and butyric acid.…”

Section: Resultsmentioning

confidence: 99%

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Selective Oxidation of n‐Butanol Using Gold‐Palladium Supported Nanoparticles Under Base‐Free Conditions

et al. 2014

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The base-free selective catalytic oxidation of n-butanol by O2 in an aqueous phase has been studied using Au-Pd bimetallic nanoparticles supported on titania. Au-Pd/TiO2 catalysts were prepared by different methods: wet impregnation, physical mixing, deposition-precipitation and sol immobilisation. The sol immobilisation technique, which used polyvinyl alcohol (PVA) as the stabilizing agent, gave the catalyst with the smallest average particle size and the highest stable activity and selectivity towards butyric acid. Increasing the amount of PVA resulted in a decrease in the size of the nanoparticles. However, it also reduced activity by limiting the accessibility of reactants to the active sites. Heating the catalyst to reflux with water at 90 °C for 1 h was the best method to enhance the surface exposure of the nanoparticles without affecting their size, as determined by TEM, X-ray photoelectron spectroscopy and CO chemisorption analysis. This catalyst was not only active and selective towards butyric acid but was also stable under the operating conditions.

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Section: Sol_2xpva_ref90supporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Selective Oxidation of n‐Butanol Using Gold‐Palladium Supported Nanoparticles Under Base‐Free Conditions

et al. 2014

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“…Even though these studies were not focused on catalysis, they proved the feasibility of imaging various Au-based alloys by FIM; alloys which are now used for catalysis applications: AuMo [228] for the reverse water-gas shift reaction [229,230] or as N2 dissociation catalyst for the HaberBosch process [231], Au-Pt [224] for CO oxidation [49,232] and selective toluene oxidation [52], AuFe [226] for CO oxidation [233] and N2 dissociation catalyst for the Haber-Bosch process [231], and Au-Cu [225,234] for the water gas-shift reaction [235,236] and CO oxidation [50].…”

Section: Perspectivesmentioning

confidence: 99%

“…In addition to this, a decreased size of the particles increases the dispersion, and accordingly the number of edges and kinks on the metallic particles: such highly uncoordinated surface sites could correspond to the preferential adsorption sites, and their increasing number could then be responsible for the increasing reactivity of the catalytic materials. During the last decade, the research on catalytic materials with gold mainly focuses on the development of bimetallic gold-based catalysts [48][49][50][51][52]. Indeed, the use of bimetallic catalysts allows, to some extent, the size sensitivity of gold catalysts to be diminished.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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“…[30,31] The total metal loading used here was 1 wt.%. For bimetallic AuPd catalyst, the weight percentages of Au and Pd were both 0.5 wt%.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Supported Bimetallic AuPd Nanoparticles as Catalyst for the Solvent-Free Selective Hydrogenation of Nitroarenes

Qu¹,

Macino²,

Iqbal³

et al. 2018

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Abstract:Selective hydrogenation of nitrobenzene was carried out under solvent-free conditions using supported AuPd nanoparticles catalyst, prepared by modified impregnation method (M Im ), as efficient catalyst. >99% yield of aniline (AN) was obtained after 15 hours at 90 °C, 3 bar H 2 that can be used without any further purification or separation, therefore reducing cost and energy input. Supported AuPd nanoparticles catalyst, prepared by M Im , was found to be active and stable even after 4 recycle experiments whereas the same catalyst prepared by S Im deactivated during the recycle experiments.The most effective catalyst was tested for the chemoselective hydrogenation of 4-chloronitrobenzene (CNB) to 4-chloroaniline (CAN). The activation energy of CNB to CAN was found to be 25 kJ mol -1 , while that of CNB to AN was found to be 31 kJ mol -1 . Based on this, the yield of CAN was maximized (92%) by lowering the reaction temperature to 25 °C.

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Selective catalytic oxidation using supported gold–platinum and palladium–platinum nanoalloys prepared by sol-immobilisation

Cited by 39 publications

References 25 publications

Selective Oxidation of n‐Butanol Using Gold‐Palladium Supported Nanoparticles Under Base‐Free Conditions

Selective Oxidation of n‐Butanol Using Gold‐Palladium Supported Nanoparticles Under Base‐Free Conditions

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Supported Bimetallic AuPd Nanoparticles as Catalyst for the Solvent-Free Selective Hydrogenation of Nitroarenes

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