The sulphidation process of two catalysts (Mo/Al 2 O 3 and CoMo/Al 2 O 3 ) has been investigated by time-resolved X-ray Absorption Spectroscopy. With the unique edge jumping capability available at the SOLEIL synchrotron, studies of cobalt and molybdenum species have been conducted simultaneously on the same bimetallic catalyst. A methodology combining Principal Component Analysis and Multivariate Curve Resolution with Alternating Least Squares methods unravels a 3-stepped or 4-stepped sulphidation process for the bimetallic and monometallic catalysts, respectively. An oxysulphide-based molybdenum species has been identified as an intermediate for Mo/Al 2 O 3 and a MoS 3 -like species has been observed for both catalysts.
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Rochet et al. (2016) studied this question.
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