Sensitivity of supported MoS2-based catalysts to carbon monoxide for selective HDS of FCC gasoline: Effect of nickel or cobalt as promoter

- Higher activity of HDS and HYD activities of the gasoline model feed in the presence of nickel and cobalt as promoter.
- Strong inhibiting effect induced by CO only with CoMoS/Al2O3.
- Higher adsorption energy of CO on CoMoS/Al2O3.
- NiMoS and MoS2, almost unsensitive to CO for HDS and hydrogenation reactions.
- No selectivity modification in presence of CO.

The impact of CO, a by-product of biomass transformation, on the transformation of a model FCC gasoline composed of 2-methylthiophene (2MT) and 2,3-dimethylbut-2-ene (23DMB2N) molecules, over MoS2 based catalyst supported over alumina was investigated. More specifically, the effect of the presence and the type of the promoter (Ni or Co) was studied. A gain in activity in HDS of 2MT and hydrogenation of olefins has been confirmed in the presence of the catalysts promoted by cobalt or nickel. However, surpringly, depending on the promoter (Ni or Co), the effect of the presence of CO is really different. In fact, while the carbon monoxide has a significant negative impact on the CoMoS/Al2O3 catalyst for the transformation of model molecules, no effect is observed for other catalysts. These differences could be attributed to a lower adsorption energy of CO on the non-promoted catalyst and promoted by nickel relative to the catalyst promoted by cobalt as calculated.

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