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• W2003949596 abstract "A continuous gas flow magic angle spinning (MAS) NMR probehead has been developed, which enables simultaneously the observation of catalytic events occurring on catalyst surfaces and the on-line identification of the gas products in the output using mass spectrometry. The temperature inside the MAS rotor in the probe has been controlled and measured by 207Pb MAS NMR spectroscopy of Pb(NO3)2. The hydrogenation of toluene to methylcyclohexane on Pt/ZrO2–SO4 (sulfated zirconia) has been used to demonstrate the ability of this probe to study heterogeneous reaction in situ in flow conditions (operando). The MAS NMR and mass spectrometry were in good qualitative agreement for the analysis of the reaction products. The reaction performed in parallel under similar conditions on a conventional fixed bed catalytic reactor shows that the reactant diffusion and their interaction with the active sites in the MAS NMR reactor are comparable in both conventional and NMR experiments. To cite this article: V. Sundaramurthy et al., C. R. Chimie 9 (2006). Une sonde RMN MAS (rotation à l'angle magique) en « flux de gaz continu » a été développée. Elle permet l'observation des événements catalytiques se produisant à la surface d'un catalyseur et simultanément l'analyse en ligne des produits de réaction par spectrométrie de masse. La température interne du rotor MAS a été mesurée et contrôlée par RMN du plomb (207Pb) dans Pb(NO3)2. La réaction d'hydrogénation du toluène en méthylcyclohexane conduite sur Pt/ZrO2–SO4 (zircone sulfatée) a été choisie pour démontrer la capacité de la sonde à suivre une réaction in situ dans des conditions de flux continu (operando). L'analyse des produits par spectroscopie RMN et spectroscopie de masse a montré un bon accord qualitatif. La réaction réalisée dans des conditions similaires dans un réacteur catalytique en lit fixe conventionnel montre que la diffusion des réactifs et leur interaction avec les sites actifs dans le réacteur RMN MAS sont comparables dans les deux expériences. Pour citer cet article : V. Sundaramurthy et al., C. R. Chimie 9 (2006)." @default.
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• W2003949596 date "2006-03-01" @default.
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• W2003949596 title "A continuous gas flow MAS NMR probe for operando studies of hydrocarbon conversion on heterogeneous catalysts" @default.
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• W2003949596 doi "https://doi.org/10.1016/j.crci.2005.06.019" @default.
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