From Gas to Liquid Phase Sulfidation: An IR Spectroscopy Study

Abstract

A side by side characterization of gas and liquid phase activation of a CoMo/Al 2 O 3 hydrodesulfurization (HDS) catalyst is reported using thiophene HDS as a test reaction and CO adsorption monitored by infrared spectroscopy. The liquid phase sulfidation (high pressure, dimethyldisulfide) leads to the formation of CoMoS sites with higher intrinsic activity compared to the gas phase (H 2 S/H 2 ).

Catalysis by sulfides: Advanced IR/CO spectroscopy for the identification of the most active sites in hydrodesulfurization reactions

“…The and CoMo/SiO 2 were considered as a basis for partitioning the area of the bands assigned to CO adsorption on non-promoted and promoted sites on the spectra obtained at CO saturation. Two peaks at about 2098 and 2110 cm -1 were used for non-promoted sites [27,41]; three peaks at about Quantification of sites was performed distinguishing non-and promoted sites and using extinction coefficients of 15 and 43 cm•µmol -1 respectively [28,40]. The quantification of the Mo sites and main components of CoMoS sites is summarized in Table 3.…”