Papers by Silvia Ronchetti
Materials Research Bulletin, 2010
In situ high temperature X-ray diffraction under reducing atmosphere is used for the first time... more In situ high temperature X-ray diffraction under reducing atmosphere is used for the first time to study the thermal stability and transformations of Co-and Fe-exchanged A and X zeolites. TG-DTA and ex situ XRD characterization were also carried out. The ...
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Powder Diffraction, 1997
ABSTRACT
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ChemInform, 2001
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Materials Science Forum, 1998
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Studies in Surface Science and Catalysis, 2001
The results obtained from the investigation of the crystallochemical properties of a family of mi... more The results obtained from the investigation of the crystallochemical properties of a family of mixed Li-vanadates of general formula LiCoyNi(1−y)VO4 are reported. This kind of material is believed to be a valid alternative to the traditional positive electrode materials in the Li-ion cell, an electrochemical power source of outstanding importance in the portable electronics field. The powders, prepared via two
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Materials Chemistry and Physics, 2003
Three kinds of Mn-containing perovskites, LaMnO3, La0.9MnO3 and LaMn0.9O3, have been investigated... more Three kinds of Mn-containing perovskites, LaMnO3, La0.9MnO3 and LaMn0.9O3, have been investigated for methane combustion in the temperature range 475–600°C. It has been possible to evidence that LaMn0.9O3 shows the greatest catalytic activity, probably because of its surface area, and also because its defect structure is favourable for development of active sites. The conversion observed as a function of temperature
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Solid State Ionics, 2002
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Polymer International, 2010
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Polymer, 2007
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Materials Science and Engineering: B, 2001
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Materials Research Bulletin, 1999
The ternary phase diagram AlâOâ-SiOâ-LaâOâ was investigated at 1,300 C. The samples were prepared... more The ternary phase diagram AlâOâ-SiOâ-LaâOâ was investigated at 1,300 C. The samples were prepared by wet chemical route (sol-gel synthesis) and characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), and EDX microprobe analysis. The XRD powder pattern data of LaââSiâOââ compound, as obtained by us, reconfirm the structure proposed in the literature, though with significantly different lattice parameters. No
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Materials Research Bulletin, 2010
In situ high temperature X-ray diffraction under reducing atmosphere is used for the first time... more In situ high temperature X-ray diffraction under reducing atmosphere is used for the first time to study the thermal stability and transformations of Co-and Fe-exchanged A and X zeolites. TG-DTA and ex situ XRD characterization were also carried out. The ...
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Materials Research Bulletin, 1999
Metal vanadates of K, Rb, and Cs and their solid solutions were prepared by reaction between carb... more Metal vanadates of K, Rb, and Cs and their solid solutions were prepared by reaction between carbonates and vanadium(V) oxide, characterized by X-ray diffraction and tested as catalysts for carbon combustion. These vanadates are all orthorhombic but show different lattice parameters depending on the ionic radius of alkali metals. A complete solubility in the solid state was found to exist
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Materials Chemistry and Physics, 2002
ABSTRACT Perovskite LaFeO3 and derived materials La(1−ϵ)FeO(3−1.5ϵ) with ϵ=0.1, 0.2, 0.3 have bee... more ABSTRACT Perovskite LaFeO3 and derived materials La(1−ϵ)FeO(3−1.5ϵ) with ϵ=0.1, 0.2, 0.3 have been prepared as polycrystalline powders by thermal low-temperature decomposition of La and Fe nitrates, a method which ensures a high surface area. They have been used in catalytic methane combustion in the range 300–450°C, showing a 100% selectivity to carbon dioxide. The reaction is indeed characterised by two ranges with different dependence of the reaction rate on temperature, as shown by the Arrhenius plot, whose slope decreases markedly above about 375°C. Temperature programmed desorption experiments of oxygen allowed us to ascertain the presence of two surface oxygen species, whose desorption occurs, respectively before and after the above indicated temperature on this basis, we propose here an hypothesis on the way of working of the catalysts. The characterisation of the catalysts has been then completed by means of temperature programmed reduction, whose results contribute to strengthen the hypothesis that the catalyst reduction operated by methane involves a smaller number of lattice planes than reduction of hydrogen.
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Journal of Thermal Analysis, 1996
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Journal of Thermal Analysis and Calorimetry, 2008
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Journal of the European Ceramic Society, 2008
Two structural models representative of the average structure of mullite Al2(Al2+2xSi2−2x)O10−x□x... more Two structural models representative of the average structure of mullite Al2(Al2+2xSi2−2x)O10−x□x have been developed. The models have been used to perform a quantum mechanical (ab initio) calculation with the Castep program (Accelrys®) in order to evaluate the internal energy of mullite with a compositional range of x=0.25–0.492. In addition, the real sillimanite structure (x=0) has been compared with the computational
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Journal of the European Ceramic Society, 2000
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Journal of the European Ceramic Society, 2001
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The Journal of Supercritical Fluids, 2009
... a Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Du... more ... a Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy. Received 26 June 2008; revised 19 January 2009; accepted 20 January 2009. Available online 30 January 2009. Abstract. ...
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Papers by Silvia Ronchetti