The effect of metal deposition order on the synergistic activity of Au–Cu and Au–Ce metal oxide catalysts for CO oxidation

Николаев, С. А.; Голубина, Е. В.; Кротова, И. Н.; Шилина, М. И.; Chistyakov, A. V.; Kriventsov, V. V.

doi:10.1016/j.apcatb.2014.12.030

Cited by 53 publications

(29 citation statements)

References 72 publications

(126 reference statements)

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“…The average particles size in the bimetallic sample is 8 nm. A study of the surface chemistry for [29]. It follows from the XPS and DRIFTS data [29] Figure 6 shows the plot for CO conversion versus the number of reaction mixture pulses for the Au-Cu(NW)/glass sample.…”

Section: Resultsmentioning

confidence: 99%

“…A study of the surface chemistry for [29]. It follows from the XPS and DRIFTS data [29] Figure 6 shows the plot for CO conversion versus the number of reaction mixture pulses for the Au-Cu(NW)/glass sample. It can be seen that during reactor heating, the CO conversion on Au-Cu(NW) does not depend on the pulse number.…”

Section: Resultsmentioning

confidence: 99%

“…Since this decay is induced by unfreezing the surface atom mobility, the nanowire temperature stability can be improved by doping the major metal by another metal that is readily oxidized in air, as was demonstrated by copper doping of silver [25,26]. In addition, as compared with other metals, copper seems to be a promising additive to gold due to the synergistic effects detected for supported Au-Cu catalysts in the CO oxidation [28][29][30].…”

Section: Introductionmentioning

confidence: 95%

“…The pulsed microcatalytic method commonly used, in particular by us, for the catalysts testing [29] was applied for the comparative study of nanoparticle and nanowire catalytic activity. The oxidation of СО with molecular oxygen was performed in a tubular quartz reactor in a pulsed regime.…”

Section: Co Oxidationmentioning

confidence: 99%

“…Au-Cu (NP), Au(NP), and Cu(NP) nanoparticles were prepared by impregnation and deposition-precipitation as described in [29]. Gamma alumina (Catalyst LLC, S = 160 m 2 /g, 2-mm grains) was used as a support for particles.…”

Section: Synthesis Of Catalystsmentioning

confidence: 99%

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Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

et al. 2015

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The copper-doped gold nanowires (4 nm in diameter) were produced by the novel technique based of laser ablation of Au-Cu alloy inside superfluid helium. The principle of the method is using the quantized vortices as the 1D template for the condensation of the ablation products into thin threads. The nanowires were applied as the catalyst in СО oxidation with oxygen. The activity of Au-Cu nanowires deposited on glass filters was compared with that for monometallic and bimetallic Au and Cu particles (3-8 nm in diameter) deposited on alumina by traditional deposition-precipitation and impregnation techniques. The apparent activation energies of the reaction (Еа) were 95 and 98, 150, and 147 kJ/ mol for Au-Cu nanowires and Au-Cu, Au, and Cu particles, respectively. During running-in of the Au-Cu nanowirebased catalyst, Еа decreased to 20 kJ/mol and retained at this level in the subsequent cycles of lowering and raising the reactor temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Co Oxidationmentioning

confidence: 99%

Section: Synthesis Of Catalystsmentioning

confidence: 99%

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Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

et al. 2015

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Structural Isomerism of Two Ce‐BTC for Fabricating Pt/CeO₂ Nanorods toward Low‐Temperature CO Oxidation

Fan

Wang

et al. 2020

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Metal–organic frameworks (MOFs) have attracted enormous research interest as precursors/templates to prepare catalytic materials. However, the effect of structural isomerism of MOFs on the catalytic performance has rarely been studied. In this contribution, two topologically different Ce‐benzene tricarboxylate (Ce‐BTC) based on the same ligands and metal centers (viz., “MOF isomers”) are prepared and used as porous supports to load Pt nanoparticles (NPs), which shows distinct differences in porosities and loading behaviors of Pt. Strikingly, an irreversible framework transformation from tetragonal Ce‐BTC to monoclinic isomer is observed during water soaking treatment. The results give clear evidence that Pt/CeO2 derived from tetragonal Ce‐BTC inclines to produce more Pt0 and smaller Pt NPs, which eventually improve the catalytic performance for CO oxidation (T100 = 80 °C). In situ diffuse reflectance infrared Fourier transform spectroscopy analyses demonstrate that the adsorbed CO–Pt0 is the dominant intermediate for CO oxidation, rather than CO–Ptσ+ at the low temperature. Furthermore, MOF isomers based on the same structural units are also found in other Ln‐MOFs, such as Er‐BTC, Eu‐BTC, Y‐BTC, and Ce/Y‐BTC. Overall, this study affords a fundamental understanding of the effect of MOF structural isomers on the catalytic performance of the derived composites.

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Au–Ag/CeO2 and Au–Cu/CeO2 Catalysts for Volatile Organic Compounds Oxidation and CO Preferential Oxidation

et al. 2015

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Oxidation of volatile organic compounds (VOC) and preferential oxidation of CO in the excess of H 2 (CO-PROX) were investigated over mono and bimetallic Au-Ag/CeO 2 and Au-Cu/CeO 2 catalysts. For the oxidation of VOC (2-propanol, ethanol and toluene) Au/CeO 2 was the most active catalyst for the combustion of alcohols to CO 2 , Ag/CeO 2 gave the best performance in the toluene total oxidation, Au-Ag/CeO 2 and Au-Cu/CeO 2 showed the highest selectivity to partial oxidation products. For CO-PROX Au-Ag/CeO 2 and Au-Cu/CeO 2 samples exhibited higher CO 2 yield at low temperature than monometallic ones. The improved performance of bimetallic catalysts were accounted for an enhancement of surface ceria oxygens mobility caused by the addition of Ag or Cu to Au/ CeO 2 and involved in both investigated reactions. This effect was more evident on Au-Ag/CeO 2 where a strong Au-Ag interaction occurred with formation of Au-Ag alloy or linked monometallic nanoparticles. Graphical Abstract

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The effect of metal deposition order on the synergistic activity of Au–Cu and Au–Ce metal oxide catalysts for CO oxidation

Cited by 53 publications

References 72 publications

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

Structural Isomerism of Two Ce‐BTC for Fabricating Pt/CeO₂ Nanorods toward Low‐Temperature CO Oxidation

Au–Ag/CeO2 and Au–Cu/CeO2 Catalysts for Volatile Organic Compounds Oxidation and CO Preferential Oxidation

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The effect of metal deposition order on the synergistic activity of Au–Cu and Au–Ce metal oxide catalysts for CO oxidation

Cited by 53 publications

References 72 publications

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

Application of Au–Cu nanowires fabricated by laser ablation in superfluid helium as catalysts for CO oxidation

Structural Isomerism of Two Ce‐BTC for Fabricating Pt/CeO2 Nanorods toward Low‐Temperature CO Oxidation

Au–Ag/CeO2 and Au–Cu/CeO2 Catalysts for Volatile Organic Compounds Oxidation and CO Preferential Oxidation

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Structural Isomerism of Two Ce‐BTC for Fabricating Pt/CeO₂ Nanorods toward Low‐Temperature CO Oxidation