Structure, microstructure, and size dependent catalytic properties of nanostructured ruthenium dioxide

Nowakowski, Paweł; Dallas, J.-P.; Villain, S.; Kopia, Agnieszka; Gavarri, J.R.

doi:10.1016/j.jssc.2008.01.047

Cited by 11 publications

(13 citation statements)

References 28 publications

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“…The information on strain and the particle size of the nanocrystals could be obtained from the FWHM of the diffraction peaks. The FWHMs can be expressed as a linear combination of the contributions from the strain (e) and the particle size (D) through the following relation [26]:…”

Section: Structure and Morphologymentioning

confidence: 99%

Hydrothermal synthesis and characterization of CuCrO2 laminar nanocrystals

Zhou

Fang

Deng

et al. 2008

Journal of Crystal Growth

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Section: Structure and Morphologymentioning

confidence: 99%

Hydrothermal synthesis and characterization of CuCrO2 laminar nanocrystals

Zhou

Fang

Deng

et al. 2008

Journal of Crystal Growth

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“…It is necessary to remind that the ceria coated carbon nanotubes have an average dimension (500 nm × 50 nm) larger than the dimensions of isolated ceria nano-grains (linear dimension of about 10 nm). If the nature of solid-gas interactions was assumed unchanged in all samples, then we could have expected a decreasing reactivity of the composite samples, because of decreasing number of active sites (the catalytic efficiency, therefore active sites number, was mainly correlated to the grain size) [36]: this is not the case in our experiments. So, we can conclude that ceria coated carbon nanotubes present specific catalytic activities and are at the origin of the improved conversion of CO into CO 2 .…”

Section: Solid-gas Interactions and Ftir Analysesmentioning

confidence: 77%

Electrical properties and reactivity under air–CO flows of composite systems based on ceria coated carbon nanotubes

David

Arab

Guinneton

et al. 2011

Chemical Engineering Journal

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, et al.. Electrical properties and reactivity under air-CO flows of composite systems based on ceria coated carbon nanotubes. Chemical Engineering Journal, Elsevier, 2011Elsevier, , vol. 171, pp. 272-278. 10.1016Elsevier, /j.cej.2011 This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 8690 OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Nanocomposite systems of ceria nanoparticles and Double Walled Carbon Nanotubes (DWNTs) coated with nano-ceria (n-CeO 2 ) were elaborated using a classical sol gel method. Three samples noted as [n-CeO 2 + xDWNTs] with variable weight fractions x = 0, 5 and 15 wt.% of DWNTs were obtained. The samples were characterized by X-ray diffraction and electron microscopy. The electrical conductivity of [n-CeO 2 + xDWNTs] compacted pellets systems was determined from electrical impedance spectrometry, under air, between 120 and 400• C. In this temperature range, all samples were semi-conducting with a weak variation of activation energy. However, the conductivity strongly increased with the weight fraction of ceria coated carbon nanotubes. Finally, the solid-gas interactions between air-CO flows and these systems were studied as a function of time and temperature, by means of Fourier transform infrared (FTIR) spectroscopy. The oxidation kinetics of CO into CO 2 was analyzed from the evolutions of FTIR absorption band intensities. As the carbon nanotube fraction x increased, the conversion efficiency was strongly improved.

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“…Previous studies [25][26][27] provide evidence of the strong correlation of the catalytic activity (gas conversion) with various parameters: grain size (surface area), temperature and conduction properties. Several studies have been done on CO oxidation of lanthanum nickelates and cobaltates with perovskite structure.…”

Section: Catalytic Activitymentioning

confidence: 98%

LaNi0.3Co0.7O3-δ and SrFe0.2Co0.8O3-δ Ceramic Materials: Structural and Catalytic Reactivity under CO Stream

et al. 2014

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Abstract:In this study, we presented the synthesis of LaNi 0.3 Co 0.7 O 3−δ (LNCO) and SrCo 0.8 Fe 0.2 O 3−δ (SFCO) perovskites and their catalytic reactivity under CO gas flow. The synthesis method is based on the complexation method combining ethylenediaminetetraacetic acid (EDTA)-citrate. The as-prepared materials were characterized using X-ray diffraction/Rietveld refinement and electron microscopy. The diffractograms and Rietveld refinement showed that the EDTA-citrate method allows us to obtain monophasic powders with submicronic size. The structural analyses revealed different morphologies linked to the crystallinity of LNCO and SFCO, and to the mean crystallite size. The catalytic performances of LNCO and SFCO were studied in situ by Fourier Transform InfraRed spectrometer as a function of time and temperature. The catalytic process gave rise to total oxidation with carbon dioxide and water production. LNCO and SFCO exhibit the same profile for catalytic activity with a conversion rate of twice as high for LNCO. Below 150 °C, the kinetic conversion is slow, but beyond this temperature they reach rapidly the complete transformation at 250 °C and 275 °C for LNCO and SFCO, respectively. OPEN ACCESSCatalysts 2014, 4 78

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Structure, microstructure, and size dependent catalytic properties of nanostructured ruthenium dioxide

Cited by 11 publications

References 28 publications

Hydrothermal synthesis and characterization of CuCrO2 laminar nanocrystals

Hydrothermal synthesis and characterization of CuCrO2 laminar nanocrystals

Electrical properties and reactivity under air–CO flows of composite systems based on ceria coated carbon nanotubes

LaNi0.3Co0.7O3-δ and SrFe0.2Co0.8O3-δ Ceramic Materials: Structural and Catalytic Reactivity under CO Stream

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