Articles | Volume 4, issue 1
J. Sens. Sens. Syst., 4, 143–149, 2015
J. Sens. Sens. Syst., 4, 143–149, 2015

Regular research article 13 Apr 2015

Regular research article | 13 Apr 2015

Is it possible to detect in situ the sulfur loading of a fixed bed catalysts with a sensor?

P. Fremerey et al.

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Cited articles

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Blachnik, R.: Taschenbuch für Chemiker und Physiker: Elemente, anorganische Verbindungen und Materialien, Minerale, Band 3, Springer, Heidelberg, 644 pp., 1998.
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Bjorklund, R. B., Söderberg, D., and Lundström, I.: Electrical-conductance Responses of Catalysts Exposed to Pulses of H2 and O2, Journal of Chemical Society, Faraday Transactions, 81, 1715–1724, 1985.
Cruz-Estrada, R. H. and Folkes, M. J.: Structure formation and modelling of the electrical conductivity in SBS-polyaniline blends: Part I: Percolation theory approach, J. Mater. Sci. Lett., 21, 1427–1429, 2002.
Short summary
A concept to measure in situ sulfidation of silica pellet catalysts loaded with nickel is evaluated. During sulfidation between 100 and 400°C nickel sulfides form. The electrical impedance of the pellets was recorded in situ. At first, the particles are highly insulating but during sulfidation their conductivity increases by decades. Since nickel sulfides are less conductive than nickel, the strong conductivity increase may be due to conducting percolation paths that form during sulfidation.