The role of metal–support interaction in Ag/CeO2 catalysts for CO and soot oxidation

Grabchenko, Maria V.; Mamontov, G. V.; Зайковский, В. И.; Parola, Valeria La; Liotta, Leonarda F.; Vodyankina, O. V.

doi:10.1016/j.apcatb.2019.118148

Cited by 190 publications

(105 citation statements)

References 99 publications

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“…The reason is that metallic nanoclusters on the surface increase the oxygen-vacancy concentration and improve the charge transfer. 232,233 Both results in an enhancement of catalytic activity at the metal/oxide interface. 234,235 The beneficial effect of using metallic nanoclusters has been shown for a variety of mesoporous oxides.…”

Section: Mesoporous Metal Oxides In Catalysismentioning

confidence: 99%

“…However, the metal nanoparticles on the surface not only affect the adsorption and dissociation reactions by activating the gas molecules (chemical sensitization) 257,259 but also facilitate oxygen-vacancy formation. 232,233 Shimizu et al studied the gas sensing properties of porous thick films of SnO 2 loaded with 1 wt% Pt or Pd. 260,270 While the sensitivity to H 2 and CH 4 at the surface was improved in the presence of noble metals, it deteriorated in the interior.…”

Section: Mesoporous Metal Oxides For Gas Sensorsmentioning

confidence: 99%

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Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

Celik

Brezesinski

et al. 2021

Phys. Chem. Chem. Phys.

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Section: Mesoporous Metal Oxides In Catalysismentioning

confidence: 99%

Section: Mesoporous Metal Oxides For Gas Sensorsmentioning

confidence: 99%

Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

Celik

Brezesinski

et al. 2021

Phys. Chem. Chem. Phys.

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“…There is, however, no consensus as to how silver impacts the reducibility of Ag-Au catalysts. Some studies show a trend of shifting to lower T max values with the increase in the Au content for some supports, such as ZnO [22], whereas those in which TiO 2 [10] and CeO 2 [13] were used as the supports do not. With only 7% conversion of CO for both the monometallic silver catalysts noted at 150 • C, compared to values of approximately 70% for all the gold-containing systems, it was concluded that, at this temperature, the effect of silver in the bimetallic systems is not in substantial conversion of CO, but in assisting Au in CO conversion, as the literature suggests.…”

Section: Resultsmentioning

confidence: 99%

“…Silver is known to bind to oxygen easily, which is beneficial in CO oxidation [10]. In the case of CO oxidation or PROX, there are very few studies that employ bimetallic Au-Ag systems.…”

Section: Introductionmentioning

confidence: 99%

Activity of Ag/CeZrO2, Ag+K/CeZrO2, and Ag-Au+K/CeZrO2 Systems for Lean Burn Exhaust Clean-Up

Iwanek

Liotta

Williams³

et al. 2021

Catalysts

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Herein, the activity of Ag and bimetallic Au-Ag catalysts, supported over Ce0.85Zr0.15O2 (CZ), was investigated in a complex stream, whose components included CO, C3H8, NO, O2, and, optionally, an injection of water vapor. In such a stream, three of the possible reactions that can occur are CO oxidation, propane combustion, and NO oxidation. The aim of these studies was to explore whether silver, due to its strong affinity to oxygen, will counteract the stabilization of oxygen by potassium. The effect of the presence of potassium ions on the activity of the monometallic silver catalysts is beneficial in the complex stream without water vapor in all three studied reactions, although it is negligible in the model CO stream. It has been shown that water vapor strongly suppresses the activity of the Ag+K/CZ catalyst, much more so than that of the Ag/CZ catalyst. The second purpose of the work was to determine whether the negative effect of potassium ions on the activity of nanogold catalyst can be countered by the addition of silver. Studies in a model stream for CO oxidation have shown that, for a catalyst preloaded with gold, the effect of potassium is nulled by silver, and the activity of AuAg + 0.15 at%K/CZ and AuAg + 0.30 at%K/CZ is the same as that of the monometallic Au catalyst. Conversely, when the reaction is carried out in a complex stream, containing CO, C3H8, NO, O2, and water vapor, the presence of water vapor leads to higher CO conversion as well as increased NO2 formation and slightly suppresses the C3H8 combustion.

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“…Venkataswamy et al reported nanostructured Ce 0.7 Mn 0.3 O 2–δ and Ce 0.7 Fe 0.3 O 2–δ solid solutions for diesel soot oxidation and determined that Mn-doped CeO 2 exhibited higher catalytic activity and better stability than the Fe-doped CeO 2 sample [32]. Grabchenko et al [33,34] reported that CeO 2 -based catalysts containing Ag within the CeO 2 structure can greatly improve the reactivity of CeO 2 toward soot oxidation. According to these reports, transition metals combined with ceria oxides can significantly affect the soot oxidation reaction by decreasing the onset temperature and the activation energy of the process.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

et al. 2019

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A series of NiO–CeO2 mixed oxide catalysts have been synthesized by a modified coprecipitation method at three different pH values (pH = 8, 9, and 10). The NiO–CeO2 mixed oxide samples were characterized by TGA, XRD, inductively coupled plasma atomic emission spectroscopy (ICP-AES), FTIR, Brunauer–Emmett–Teller (BET) surface area, H2 temperature-programmed reduction (H2-TPR), and electron microscopy (high-angle annular dark-field transmission electron microscopy/energy-dispersive X-ray spectroscopy (HAADF-TEM/EDS)). The catalytic activities of the samples for soot oxidation were investigated under loose and tight contact conditions. The catalysts exhibited a high BET surface area with average crystal sizes that varied with the pH values. Electron microscopy results showed the formation of small crystallites (~5 nm) of CeO2 supported on large plate-shaped particles of NiO (~20 nm thick). XRD showed that a proportion of the Ni2+ was incorporated into the ceria network, and it appeared that the amount on Ni2+ that replaced Ce4+ was higher when the synthesis of the mixed oxides was carried out at a lower pH. Among the synthesized catalysts, Ni-Ce-8 (pH = 8) exhibited the best catalytic performance.

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The role of metal–support interaction in Ag/CeO2 catalysts for CO and soot oxidation

Cited by 190 publications

References 99 publications

Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

Activity of Ag/CeZrO2, Ag+K/CeZrO2, and Ag-Au+K/CeZrO2 Systems for Lean Burn Exhaust Clean-Up

Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

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