Co-K and Mo-K edges Quick-XAS study of the sulphidation properties of Mo/Al2O3 and CoMo/Al2O3 catalysts

Amélie Rochet (1, 2, 3) , Bertrand Baubet (3) , Virginie Moizan-Baslé (3) , Christophe Pichon (3) , Valérie Briois (2)

1 LNLS - Laboratório Nacional de Luz Sìncrotron
2 SSOLEIL - Synchrotron SOLEIL
3 IFPEN - IFP Energies nouvelles

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 the 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 has been identified as intermediate for Mo/Al 2 O 3 and a MoS 3-like species has been observed for both catalysts.

Mots clés: Hydrodesulphurisation; Time-resolved XAS; Chemometric methods; Intermediates; CoMo/Al2O3; Mo/Al2O3

Domaines: Chimie; Catalyse

Amélie Rochet, Bertrand Baubet, Virginie Moizan-Baslé, Christophe Pichon, Valérie Briois. Co-K and Mo-K edges Quick-XAS study of the sulphidation properties of Mo/Al2O3 and CoMo/Al2O3 catalysts. Comptes Rendus. Chimie, 2016, 19 (10), pp.1337-1351. ⟨10.1016/j.crci.2016.01.009⟩. ⟨hal-01453004⟩