A TEM and UV–visible study of silver reduction by ethanol in Ag–alumina catalysts

Sayah, Elie; Brouri, Dalil; Wu, Yeke; Musi, Andrea; Costa, Patrick Da; Massiani, Pascale

doi:10.1016/j.apcata.2011.08.016

Cited by 36 publications

(28 citation statements)

References 52 publications

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“…The reduction of silver ion was attributed to the presence of ethanol as solvent in sol-gel process. 49 Both data are in line with the deep gray color (due to the presence of metallic silver particles) observed for BG doped with higher silver content.…”

Section: Resultssupporting

confidence: 82%

“…As silver in 5Ag and 10Ag is in ionic and metallic form, silver can be released in both forms when come into contact with physiological fluid. The reduction of silver ion was attributed to the presence of ethanol as solvent in sol‐gel process . Both data are in line with the deep gray color (due to the presence of metallic silver particles) observed for BG doped with higher silver content.…”

Section: Resultsmentioning

confidence: 97%

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Bioactive Glass: An In‐Vitro Comparative Study of Doping with Nanoscale Copper and Silver Particles

Goh

Alshemary

Akram

et al. 2014

Int J of Appl Glass Sci

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Bioactive glasses (BGs) based on 50SiO2‐45CaO‐5P2O5 system doped with 1, 5, and 10 mol% CuO or Ag2O were separately synthesized using quick alkali sol‐gel method. Scanning electron microscope (SEM) analysis of the samples confirmed the formation of nano‐sized BGs, whereas Fourier transform infrared (FTIR) spectra showed characteristic peaks for silica and phosphate groups. X‐ray diffraction (XRD) pattern of the heat‐treated (700°C) samples revealed the presence of crystalline metallic silver phase in all Ag‐doped samples, while the XRD pattern of Cu‐doped and control sample (50Si‐45CaO‐5P2O5) also heat‐treated at 700°C confirmed their amorphous nature. Ultraviolet–visible (UV‐Vis) studies along with Energy‐dispersive X‐ray spectroscopy (EDX) analysis confirmed the successful incorporation of Cu and Ag in bioglass. Antibacterial properties of the synthesized BGs were investigated by quantitative viable count method, and the results were related to the ion release profiles of the samples studied by flame atomic absorption spectroscopy (FAAS). Fast initial release of Ag observed in this study makes Ag‐doped BG a better rapid bacteria‐killing agent than Cu‐doped BG, which exhibited a prolonged release of ions, suggesting that it may be a better candidate for long‐term antibacterial protection.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 97%

Bioactive Glass: An In‐Vitro Comparative Study of Doping with Nanoscale Copper and Silver Particles

Goh

Alshemary

Akram

et al. 2014

Int J of Appl Glass Sci

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“…Often, the assessment of element spatial association relies upon visual inspection to identify structures of different compositions in the elemental maps [6][7][8]. However, this approach is insufficient when interpretable motifs do not exist or when the length scale of composition heterogeneity is similar to that of the map resolution.…”

Section: Introductionmentioning

confidence: 99%

Investigations of element spatial correlation in Mn-promoted Co-based Fischer–Tropsch synthesis catalysts

Johnson

Werner

Bustillo

et al. 2015

Journal of Catalysis

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a b s t r a c tMaking connections between performance and structure in bimetallic catalysts requires knowledge of how the two elements are spatially associated. Elemental maps obtained by analytical TEM methods are an invaluable tool for identifying the location of different elements, but for many samples, visual inspection of elemental maps is insufficient for assessing the degree of element spatial correlation. This is particularly true for beam-sensitive materials where short mapping acquisition times lead to images with high noise and low color depth. In these situations, statistical analysis of elemental maps can be used to identify spatial correlations among the elements in a sample. In this work, the relationship between catalyst performance and bimetallic spatial association was explored using Mn-promoted Cobased Fischer-Tropsch synthesis catalysts prepared by different pretreatment methods. Mn was used as a catalyst additive to suppress methane formation. Catalysts that underwent calcination before reduction produced more methane and fewer long-chain hydrocarbons than catalysts that were directly reduced. The extent to which Co and Mn were spatially associated was assessed using correlation metrics, colocation plots, and histograms generated using data from STEM-EDS maps. Although both catalysts yielded visually similar elemental maps, the results of statistical analysis suggested that the calcined catalyst exhibited greater spatial segregation between the Co and Mn. These findings support the hypothesis that having Mn in close proximity to the Co is essential for the manifestation of Mn promotion effects in Co-based FTS catalysts.

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“…4a are deconvoluted by fitting Gaussian peaks in the wavelength range 220-650 nm. Table 1 shows the wavelength of the apex of each fitted peak and the peak assignments, which are based on previous literature [28][29][30][31][32]. Fig.…”

Section: Oxidation and Reductionmentioning

confidence: 99%

Role of hydrogen formation and silver phase for methanol-SCR over silver/alumina

2015

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A TEM and UV–visible study of silver reduction by ethanol in Ag–alumina catalysts

Cited by 36 publications

References 52 publications

Bioactive Glass: An In‐Vitro Comparative Study of Doping with Nanoscale Copper and Silver Particles

Bioactive Glass: An In‐Vitro Comparative Study of Doping with Nanoscale Copper and Silver Particles

Investigations of element spatial correlation in Mn-promoted Co-based Fischer–Tropsch synthesis catalysts

Role of hydrogen formation and silver phase for methanol-SCR over silver/alumina

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