Adsorption of probe molecules to investigate by EPR the redox properties of silver loaded on ceria

Skaf, Mira; Hany, Sara; Aouad, Samer; Labaki, Madona; Abi‐Aad, Edmond; Aboukaı̈s, Antoine

doi:10.1016/j.chemphys.2018.10.015

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…Then, NO 2 and CO were chosen as probe molecules for the investigation of the film surface characteristics at the sensors’ optimal temperature for R-(+)-limonene sensing. Gas concentrations of 25 ppm and 3 ppm for CO and NO 2 , respectively, were selected according to their relative TLV-TWA [ 30 , 31 ].…”

Section: Methodsmentioning

confidence: 99%

New Approach for the Detection of Sub-ppm Limonene: An Investigation through Chemoresistive Metal-Oxide Semiconductors

Rossi

Spagnoli

Tralli

et al. 2023

Sensors

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R-(+)-limonene, one of the major constituents of citrus oils, is a monoterpene that is widely used as a fragrance additive in cosmetics, foods, and industrial solvents. Nowadays, its detection mainly relies on bulky and expensive analytical methods and only a few research works proved its revelation through affordable and portable sensors, such as electrochemical and quartz crystal microbalance sensors. In response to the demand for effective miniaturized sensing devices to be integrated into Internet of Things systems, this study represents a pioneering investigation of chemoresistive gas sensor capabilities addressed to R-(+)-limonene detection. An array of seven metal-oxide sensors was exploited to perform a complete electrical characterization of the target analyte. The experimental evidence allowed us to identify the WO3-based sensor as the most promising candidate for R-(+)-limonene detection. The material was highly sensitive already at sub-ppm concentrations (response of 2.5 at 100 ppb), consistent with applicative parameters, and it resulted in selective vs. different gases at a lower operating temperature (200 °C) than the other sensors tested. Furthermore, it exhibited a humidity-independent behavior under real-life conditions (relative humidity > 20%). Finally, the WO3 sensor also demonstrated a remarkable cross-selectivity, thus enabling its exploitation in cutting-edge applications.

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Section: Methodsmentioning

confidence: 99%

New Approach for the Detection of Sub-ppm Limonene: An Investigation through Chemoresistive Metal-Oxide Semiconductors

Rossi

Spagnoli

Tralli

et al. 2023

Sensors

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show abstract

“…This fact may be responsible for the acceleration of the reaction and the regeneration of the active sites, through successive redox cycles. M. Skaf et al have demonstrated the ability for Ag species (Ag 0 and Ag + ) supported on ceria to adsorb oxygen molecules through redox cycles [77]. The Ag-zirconia synergic effect has been observed from the characterization techniques, and the formation of a metastable tetragonal phase is observed by XRD, leading to the generation of oxygen vacancies.…”

Section: Soot C ∆Tmaxmentioning

confidence: 99%

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

et al. 2019

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This work presents the physicochemical characterization and activity of zirconia-supported silver catalysts for the oxidation of pollutants present in diesel engine exhaust (propane, propene, naphthalene and soot). A series of silver-supported catalysts AgxZ (x = 1, 5 and 10 wt.%, Z = zirconia) were prepared, which were studied by various characterization techniques. The results show that silver is mainly found under the form of small metal nanoparticles (<10 nm) dispersed over the support. The metallic phase coexists with the AgOx oxidic phases. Silver is introduced onto the zirconia, generating Ag–ZrO2 catalysts with high activity for the oxidation of propene and naphthalene. These catalysts also show some activity for soot combustion. Silver species can contribute with zirconia in the catalytic redox cycle, through a synergistic effect, providing sites that facilitate the migration and availability of oxygen, which is favored by the presence of structural defects. This is a novel application of the AgOx–Ag/ZrO2 system in the combustion reaction of propene and naphthalene. The results are highly promising, given that the T50 values found for both model molecules are quite low.

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An investigation of CeO2: Local structures of doped Ag2+ and oxidation of adsorbed CO

Ding

Zhang

Chu

2021

Molecular Catalysis

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Adsorption of probe molecules to investigate by EPR the redox properties of silver loaded on ceria

Cited by 3 publications

References 43 publications

New Approach for the Detection of Sub-ppm Limonene: An Investigation through Chemoresistive Metal-Oxide Semiconductors

New Approach for the Detection of Sub-ppm Limonene: An Investigation through Chemoresistive Metal-Oxide Semiconductors

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

An investigation of CeO2: Local structures of doped Ag2+ and oxidation of adsorbed CO

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