Abstract
In the field of heterogeneous catalysis there is an increasing need for the X-ray diffraction of catalyst compounds at elevated temperatures, especially under atmospheres comparable to those used in industrial applications. An “in-situ” diffraction system is presented which has a built-in high temperature chamber suitable for the use of inert (N2, Ar), oxidising (O2), reducing (H2) or organic atmospheres. This has been combined with a mass spectrometer for evolved gas analysis. Investigations of the thermal decomposition of silver(I)oxide (Ag2O) and the behaviour of the heteropoly catalyst H4[PVMo11O40] · n H2O during the oxydehydrogenation of isobutyric acid clearly show the usefulness of the presented apparatus.
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Herzog, B., Ilkenhans, T. & Schlögl, R. On the crystal structure of heterogeneous catalysts at reaction-conditions: “in-situ” X-ray powder diffraction. Fresenius J Anal Chem 349, 247–249 (1994). https://doi.org/10.1007/BF00323301
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DOI: https://doi.org/10.1007/BF00323301