Carbon monoxide oxidation on lithium fluoride supported gold nanoparticles: A significance of F-centers

Тваури, И.В.; Gergieva, B. E.; Magkoeva, V.D.; Grigorkina, G. S.; Bliev, A. P.; Ашхотов, О. Г.; Созаев, В. А.; Fukutani, Katsuyuki; Магкоев, Т. Т.

doi:10.1016/j.ssc.2015.04.017

Cited by 6 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Later on, Goodman and coworkers [8] also found magnesium oxide to be an effective electron donor to negatively charge supported Au particles via charge transfer from anionic vacancies (F-centers) and thus activating them as catalysts for CO oxidation. Catalytic activation of LiF supported Au particles via charge transfer from anionic vacancies has also been recently reported by Tvauri et al [9]. Electron-rich Au nanoparticles are predicted to adsorb dioxygen more strongly and to activate the O-O bond via charge transfer from Au to form a superoxo-like species [10], as well as facilitating the activation of CO [11].…”

Section: Introductionsupporting

confidence: 59%

Carbon Monoxide Oxidation over Gold Nanoparticles Deposited onto Alumina Film Grown on Mo(110) Substrate: An Effect of Charge Tunneling through the Oxide Film

Магкоев

2021

Materials

View full text Add to dashboard Cite

Formation of gold nanosized particles supported by aluminum oxide film grown on Mo(110) substrate and oxidation of carbon monoxide molecules on their surface have been in-situ studied in ultra-high vacuum by means of Auger electron spectroscopy (AES), reflection-absorption infrared spectroscopy (RAIRS), low energy electron diffraction (LEED), atomic force microscopy (AFM), temperature-programmed desorption (TPD), and work function measurements. The main focus was to follow how the thickness of the alumina film influences the efficiency of CO oxidation in an attempt to find out evidence of the possible effect of electron tunneling between the metal substrate and the Au particle through the oxide interlayer. Providing the largest degree of surface identity of the studied metal/oxide system at different thicknesses of the alumina film (two, four, six, and eight monolayers), it was found that the CO oxidation efficiency, defined as CO2 to CO TPD peaks intensity ratio, exponentially decays with the oxide film thickness growth. Taking into account the known fact that the CO oxidation efficiency depends on the amount of excess charge acquired by Au particle, the latter suggests that electron tunneling adds efficiency to the oxidation process, although not significantly.

show abstract

Section: Introductionsupporting

confidence: 59%

Carbon Monoxide Oxidation over Gold Nanoparticles Deposited onto Alumina Film Grown on Mo(110) Substrate: An Effect of Charge Tunneling through the Oxide Film

Магкоев

2021

Materials

View full text Add to dashboard Cite

show abstract

“…Investigations have been carried out in ultra-high vacuum chamber (base pressure: 10 -10 Torr) by means of atomic force microscopy (AFM), reflection-absorption infrared spectroscopy (RAIRS), X-ray and ultraviolet photoelectron spectroscopy (XPS, UPS) using Al K α (1486.6 eV) and He II (40.8 eV) irradiation, respectively [16,17]. RAIRS was designed in configuration, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Adsorption and Interaction of Carbon Dioxide and Water on the Molybdenum Oxide Surface

Grigorkina¹,

Рамонова²,

Kibizov³

et al. 2017

View full text Add to dashboard Cite

By means of X-ray and ultraviolet photoelectron spectroscopy (XPS, UPS), atomic force microscopy (AFM) and reflection-absorption infrared spectroscopy (RAIRS) it is shown that methanol is formed from carbon dioxide and water on the surface of reduced molybdenum oxide substrate MoO x (x<2) under pulsed laser irradiation at photon energy of 6.4 eV, pulse duration 9 ns and laser fluence of 4 mJ/cm 2. The key factor is MoO x defect enhanced photoinduced substrate mediated CO 2 and H 2 O bond activation, leading to formation of reaction intermediates: CH 2 O 2 → CH 2 O → O-CH 3 , forming finally methanol.

show abstract

“…Once the AuNPs catalyst is applied to industrial practical applications, the separation of AuNPs from the catalytic reaction system requires a faster approach. Considering the above problems, AuNPs immobilization on solid supports is regarded as a conventional and feasible method [ 26 , 27 , 28 , 29 , 30 , 31 ]. Chairam et al synthesized mung bean starch-AuNPs composite, which acted as both the reducing and stabilizing agents [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical AuNPs-Loaded Fe3O4/Polymers Nanocomposites Constructed by Electrospinning with Enhanced and Magnetically Recyclable Catalytic Capacities

et al. 2017

View full text Add to dashboard Cite

Gold nanoparticles (AuNPs) have attracted widespread attention for their excellent catalytic activity, as well as their unusual physical and chemical properties. The main challenges come from the agglomeration and time-consuming separation of gold nanoparticles, which have greatly baffled the development and application in liquid phase selective reduction. To solve these problems, we propose the preparation of polyvinyl alcohol(PVA)/poly(acrylic acid)(PAA)/Fe3O4 nanocomposites with loaded AuNPs. The obtained PVA/PAA/Fe3O4 composite membrane by electrospinning demonstrated high structural stability, a large specific surface area, and more active sites, which is conducive to promoting good dispersion of AuNPs on membrane surfaces. The subsequently prepared PVA/PAA/Fe3O4@AuNPs nanocomposites exhibited satisfactory nanostructures, robust thermal stability, and a favorable magnetic response for recycling. In addition, the PVA/PAA/Fe3O4@AuNPs nanocomposites showed a remarkable catalytic capacity in the catalytic reduction of p-nitrophenol and 2-nitroaniline solutions. In addition, the regeneration studies toward p-nitrophenol for different consecutive cycles demonstrate that the as-prepared PVA/PAA/Fe3O4@AuNPs nanocomposites have outstanding stability and recycling in catalytic reduction.

show abstract

Carbon monoxide oxidation on lithium fluoride supported gold nanoparticles: A significance of F-centers

Cited by 6 publications

References 21 publications

Carbon Monoxide Oxidation over Gold Nanoparticles Deposited onto Alumina Film Grown on Mo(110) Substrate: An Effect of Charge Tunneling through the Oxide Film

Carbon Monoxide Oxidation over Gold Nanoparticles Deposited onto Alumina Film Grown on Mo(110) Substrate: An Effect of Charge Tunneling through the Oxide Film

Adsorption and Interaction of Carbon Dioxide and Water on the Molybdenum Oxide Surface

Hierarchical AuNPs-Loaded Fe3O4/Polymers Nanocomposites Constructed by Electrospinning with Enhanced and Magnetically Recyclable Catalytic Capacities

Contact Info

Product

Resources

About