Nano-structural investigation of Ag/Al2O3 catalyst for selective removal of O2 with excess H2 in the presence of C2H4

Inceesungvorn, Burapat; López-Castro, Juan de Dios; Calvino, José J.; Bernal, S.; Meunier, Frédéric; Hardacre, Christopher; Griffin, Ken; Delgado, J.J.

doi:10.1016/j.apcata.2010.07.035

Cited by 23 publications

(22 citation statements)

References 33 publications

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“…In this work it was noted that under vacuum or reductive conditions, migration of Ag from clusters could only occur in the form of free metallic Ag atoms. 113 It has also been observed with DRUV, EXAFS and UV-Vis, that even under mild reduction conditions [114][115][116] including vacuum conditions 117 silver has a tendency to aggregate. For instance, EXAFS showed that upon exposure to a SCR mix, Ag + ions aggregate to form a range of active clusters of Agn δ+ (average n value of 3).…”

Section: Silvermentioning

confidence: 85%

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Morgan¹,

Goguet²,

Hardacre³

2015

ACS Catal.

165

152

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Catalyst deactivation is ultimately inevitable, and one of the processes known to cause deactivation is sintering of metal particles. Consequently, numerous methods to reverse the sintering process by re-dispersing metal nanoparticles have been developed. These methods are discussed in this perspective, and the reported mechanisms of re-dispersion are summarized. Additionally, the longer term practical use of such treatments, and the benefits this can bring, is briefly disclosed.

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Section: Silvermentioning

confidence: 85%

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Morgan¹,

Goguet²,

Hardacre³

2015

ACS Catal.

165

152

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“…Figure 3 shows the UV-DR spectra of CF, BT-CF and BF-CF-AgNPs. It can be seen that CF has two absorbance peaks at 226 nm and 275 nm, which is respectively attributed to the −C=O and benzyl groups in side chains of the collagen molecule (Inceesungvorn et al 2010;Yamamoto et al 2005). However, BT-CF exhibits relatively strong absorbance in the wavelength region of 220-415 nm.…”

Section: Tem and Sem Observationsmentioning

confidence: 95%

Silver nanoparticles stabilized by tannin grafted collagen fiber: synthesis, characterization and antifungal activity

Gao

et al. 2011

Ann Microbiol

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A novel antifungal nano-silver agent (BT-CFAgNPs) was synthesized by using bayberry tannin (BT) grafted collagen fiber (CF) as support, and the antifungal behaviors of the nano-silver were investigated by using Saccharomyces cerevisiae as a typical fungus. Bayberry tannin (BT), a kind of natural polyphenol, was grafted onto the CF surface to improve the loading capacity and control the size of the Ag nanoparticles. The main physical and chemical properties of this antifungal agent were characterized by means of Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Ultravioletvisible Diffusion Reflection Spectrum (UV-DR), X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS). It was found that this antifungal agent is in a highly ordered fibrous state. The average diameter of the Ag nanoparticles was 3.78 nm and the nanoparticles were well dispersed on BT-CF. Antifungal experiments demonstrated that BT-CF-AgNPs exhibited high antifungal activity. The number of living cells went down to zero when a cell suspension of S. cerevisiae (10 5 CFU/mL) was cultivated with BT-CF-AgNPs at 303 K for 14 h. The minimal inhibitory concentration (MIC) of BT-CF-AgNPs against S. cerevisiae was 12 μg Ag/mL. It was observed that the S. cerevisiae cells were damaged after being cultivated with BT-CF-AgNPs, accompanied by the formation of "pits" in the cell wall, while the accumulation of silver nanoparticles in the cell membrane results in the death of the cell. The present investigation indicated that BT-CF-AgNPs can be applied as a new type of antifungal material.

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“…Based on the results obtained and literature data [2,3,6], we can hypothesize that the active site in Ag/Al 2 O 3 /cordierite catalysts during selective reduction of NO by ethanol is silver, stabilized on the aluminum oxide surface in the form of Ag + cations or Ag n d+ nanoclusters (n £ 8) up to 1 nm in size, while on 4-10 nm nanoparticles of metallic silver [7] predominantly exhaustive oxidation of the alcohol by oxygen occurs without its participation in the process of NO reduction [11]:…”

Section: Resultsmentioning

confidence: 95%

“…1), we identified absorption bands with maxima at 220, 270-280, 400, and 460 nm. The absorption bands at about 220 nm are due to the electronic transitions 4d 10 ®4d 9 5s 1 in the highly dispersed Ag + cations [6,7]. The bands in the 250-390 nm region are due to charge transfer in Ag n d+ nanoclusters (n £ 8) [6][7][8], while the absorption bands at wavelengths 400-480 nm indicate the presence of nanoparticles of metallic silver in the samples [7].…”

Section: Resultsmentioning

confidence: 95%

Role of active components of an Ag/Al2O3/cordierite catalyst in selective reduction of NO by ethanol

et al. 2012

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International audienceWe show that the activity of silver/aluminum oxide catalysts in selective reduction of nitrogen oxides by ethanol increases as the Al2O3 content increases, and is determined by the optimal silver content for which Ag + cations and Ag n nanoclusters form on the Al2O3 surface. The role of silver in Ag/Al2O3/cordierite is to regulate the redox and acid-base properties of the surface of the catalyst

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Nano-structural investigation of Ag/Al2O3 catalyst for selective removal of O2 with excess H2 in the presence of C2H4

Cited by 23 publications

References 33 publications

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Silver nanoparticles stabilized by tannin grafted collagen fiber: synthesis, characterization and antifungal activity

Role of active components of an Ag/Al2O3/cordierite catalyst in selective reduction of NO by ethanol

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