Inhibiting effects in hydrodesulfurization of 4,6-diethyldibenzothiophene

摘要

This study addresses some of the inhibiting aspects of the hydrodesulfurization (HDS)of 4,6-diethyldibenzothiophene on a sulfided CoMo/Al_2O_3-SiO_2 catalyst at relatively low hydrogen pressures.It is shown that thermodynamic equilibrium does not play a significant role in inhibiting sulfur removal at 2.17 MPa hydrogen pressure at least up to 370 deg C.Both 3-ethylcarbazole and naphthalene inhibit the HDS rate,with the former being far more potent.Other electron-rich or electron-deficient substituted carbazoles are also strong inhibitors,suggesting that hte substituent-induced electronic effect is not a factor governing the poisoning potancy of the carbazole family.Operatingat high temperatures is more effective in mitigating the inhibiting effect than operating at high hydrogen pressures.A strong inhibiting effect can lead to falsification fo teh overall HDS kinetics.