Effect of glycol on the formation of active species and sulfidation mechanism of CoMoP/Al2O3 hydrotreating catalysts

The present work is focused on the role of an organic promoter (triethyleneglycol – TEG) on the activity of hydrotreating catalysts. By impregnating such compound on oxidic industrial catalyst, an enhancement of the catalytic activity in the HDS conversion of 4,6-DMDBT as well as SRGO HDS was obtained. Using several physico-chemical techniques and in situ characterization (Raman, XAS), it was found that TEG affected the coordination of Co and Mo in the oxidic species. During the activation procedure, the presence of TEG slows down the sulfidation and allows the genesis of more active “CoMoS” species.

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• Effect of triethyleneglycol (TEG) impregnated on oxidic catalysts on the HDS performance.
• TEG enhanced the formation of heteropolyanion entities by redissolution/redispersion of the active species.
• Effect of retardation of the additive on the sulfidation followed by Raman and XAS spectroscopy.