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- W2018049773 abstract "The bulk and surface characterization of tungsten carbide samples, using X-ray diffraction, XPS and chemisorption techniques are described. The aim is to establish links between the preparation factors of tungsten carbides and their catalytic properties. XPS observations have shown that tungsten carbide samples were superficially oxidized as a result of the passivation treatment to which they were submitted in order to prevent them from igniting spontaneously upon exposure to air. According to XPS data, the surface oxide was completely removed by reduction in H2 at 300 °C. No detectable variation of the lattice constants of the carbide samples could be evidenced by X-ray diffraction, which could be ascribed either to the nature of their oxide precursor or to their final composition (W2CWC ratio). On the other hand, variations of the surface CW ratio (as estimated by XPS) versus the conversion to WC have been evidenced and tentatively related to the mechanism of WC formation. The results of H2O2 titration experiments have confirmed the analogy reported previously between the chemisorptive properties of tungsten carbides and noble metal catalysts; they have been interpreted in terms of the surface accessible to gaseous molecules such as H2 and O2 (referred to below as “pseudometallic surface”). The extent of the pseudometallic surface has been found to be negligible for carbides prepared in pure CO, and it decreases for increasing conversions to WC of samples prepared in COCO2 mixtures. These observations are correlated with the accumulation of free carbon on the surface of the samples during the progress of the carburization reaction. The pseudometallic surface of tungsten carbides can therefore be interpreted as the fraction of their surface not covered by an impervious layer of pregraphitic carbon." @default.
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- W2018049773 date "1986-06-01" @default.
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- W2018049773 title "Control of the catalytic activity of tungsten carbides II. Physicochemical characterizations of tungsten carbides" @default.
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- W2018049773 doi "https://doi.org/10.1016/0021-9517(86)90367-2" @default.
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