Preparation of bimetallic gold catalysts by redox reaction on oxide-supported metals for green chemistry applications

Редина, Е. А.; Кириченко, О. А.; Greish, A. A.; Кучеров, А. В.; Ткаченко, О. П.; Капустин, Г. И.; Мишин, И. В.; Kustov, L. М.

doi:10.1016/j.cattod.2014.12.018

Cited by 34 publications

(16 citation statements)

References 89 publications

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“…48,50 The monometallic Au catalyst exhibits just one band at 2112 cm –1 , caused by the linear adsorption of CO on Au, consistent with previous findings. 51 The monometallic Pd catalyst gives rise to two distinct features: first, there is an intense band at 2098 cm –1 , which corresponds to the linear adsorption of CO at the corner or edge sites of Pd particles.…”

Section: Results and Discussionsupporting

confidence: 90%

“…The increase in nonlinear adsorption bands for their bimetallic sample was thought to be due to bridged adsorption of CO on Au–Pd species. 50 Ouyang et al also measured the ratio of the linear and nonlinear adsorption bands and found that the ratio decreases with increasing Pd content, all the way up to monometallic Pd, although those catalysts were prepared by incipient-wetness impregnation and were calcined and reduced prior to analysis. 49 …”

Section: Results and Discussionmentioning

confidence: 99%

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Synergy and Anti-Synergy between Palladium and Gold in Nanoparticles Dispersed on a Reducible Support

et al. 2016

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Highly active and stable bimetallic Au–Pd catalysts have been extensively studied for several liquid-phase oxidation reactions in recent years, but there are far fewer reports on the use of these catalysts for low-temperature gas-phase reactions. Here we initially established the presence of a synergistic effect in a range of bimetallic Au–Pd/CeZrO4 catalysts, by measuring their activity for selective oxidation of benzyl alcohol. The catalysts were then evaluated for low-temperature WGS, CO oxidation, and formic acid decomposition, all of which are believed to be mechanistically related. A strong anti-synergy between Au and Pd was observed for these reactions, whereby the introduction of Pd to a monometallic Au catalyst resulted in a significant decrease in catalytic activity. Furthermore, monometallic Pd was more active than Pd-rich bimetallic catalysts. The nature of the anti-synergy was probed by several ex situ techniques, which all indicated a growth in metal nanoparticle size with Pd addition. However, the most definitive information was provided by in situ CO-DRIFTS, in which CO adsorption associated with interfacial sites was found to vary with the molar ratio of the metals and could be correlated with the catalytic activity of each reaction. As a similar correlation was observed between activity and the presence of Au0* (as detected by XPS), it is proposed that peripheral Au0* species form part of the active centers in the most active catalysts for the three gas-phase reactions. In contrast, the active sites for the selective oxidation of benzyl alcohol are generally thought to be electronically modified gold atoms at the surface of the nanoparticles.

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Section: Results and Discussionsupporting

confidence: 90%

Section: Results and Discussionmentioning

confidence: 99%

Synergy and Anti-Synergy between Palladium and Gold in Nanoparticles Dispersed on a Reducible Support

et al. 2016

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“…The synthesis of LA from glycerol has also been studied in alkaline media in the presence of various water-soluble homogeneous catalytic systems: pincer-type ruthenium complexes [21], thermally robust Ir(I), Ir(III), and Ru(II) N-heterocyclic carbene complexes with sulfonate-functionalized wingtips [22] and others complexes [23,24]. Oxidative conversion of glycerol to LA in an alkaline media in the presence of Pt and Au based catalysts supported on various surfaces proceeds under milder conditions compared to the hydrothermal treatment [25,26]. However, the high cost and shortage of these catalytic systems reduces the prospects for their using on an industrial scale [18].…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

et al. 2019

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Mechanism analysis and kinetic modeling of glycerol conversion into lactic acid in the alkaline media with and without heterogeneous catalyst Cu NPs are reported. The reaction pathways were determined in agreement with the experimental results and comprise several types of reactions, namely dehydrogenation, hydrogenolysis, dehydration and C–C cleavage. Experimental concentration-time profiles were obtained in a slurry batch reactor at different glycerol, NaOH and Cu NPs concentrations in a temperature range of 483–518 K. Power law, Langmuir–Hinshelwood (LH) and Eley–Rideal (ER) models were chosen to fit the experimental data. The proposed reaction pathways and obtained kinetic model adequately describe the experimental data. The reaction over Cu NPs catalyst in the presence of NaOH proceeds with a significantly lower activation barrier (Ea = 81.4 kJ∙mol−1) compared with the only homogeneous catalytic conversion (Ea = 104.0 kJ∙mol−1). The activation energy for glycerol hydrogenolysis into 1,2-propanediol on the catalyst surface without adding hydrogen is estimated of 102.0 kJ∙mol−1. The model parameters obtained in this study would be used to scale an industrial unit in a reactor modeling.

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“…They concluded that, even though the support itself showed high activity, the noble metal catalysts exhibited significantly enhanced selectivity towards CO 2 compared to the ceria-zirconia support alone, gold catalysts showing somewhat lower selectivity than platinum in this case. [ 25 ] Redina et al [ 26 ] studied the performance of an Au-Rh/TiO 2 catalyst in DCM oxidation, which was prepared using surface redox reactions. In this study, bimetallic catalysts having metal contents as low as 0.05 wt.% showed high activity and HCl selectivity.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al2O3 and CeO2-Al2O3

2020

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Au, Pt, and Pt-Au catalysts supported on Al2O3 and CeO2-Al2O3 were studied in the oxidation of dichloromethane (DCM, CH2Cl2). High DCM oxidation activities and HCl selectivities were seen with all the catalysts. With the addition of Au, remarkably lower light-off temperatures were observed as they were reduced by 70 and 85 degrees with the Al2O3-supported and by 35 and 40 degrees with the CeO2-Al2O3-supported catalysts. Excellent HCl selectivities close to 100% were achieved with the Au/Al2O3 and Pt-Au/Al2O3 catalysts. The addition of ceria on alumina decreased the total acidity of these catalysts, resulting in lower performance. The 100-h stability test showed that the Pt-Au/Al2O3 catalyst was active and durable, but the selectivity towards the total oxidation products needs improvement. The results suggest that, with the Au-containing Al2O3-supported catalysts, DCM decomposition mainly occurs via direct DCM hydrolysis into formaldehyde and HCl followed by the oxidation of formaldehyde into CO and CO2.

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Preparation of bimetallic gold catalysts by redox reaction on oxide-supported metals for green chemistry applications

Cited by 34 publications

References 89 publications

Synergy and Anti-Synergy between Palladium and Gold in Nanoparticles Dispersed on a Reducible Support

Synergy and Anti-Synergy between Palladium and Gold in Nanoparticles Dispersed on a Reducible Support

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al2O3 and CeO2-Al2O3

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