Abstract
The hydrodesulfurization (HDS) of dibenzothiophene (DBT) was studied at 300 °C, 4.8 MPa H2 and 35 kPa H2S in the presence of 0 to 6 kPa 2-methylpyridine and 2-methylpiperidine. 2-Methylpyridine suppressed the hydrogenation pathway by a factor of 6 to 30, depending on its partial pressure, and moderately inhibited the direct desulfurization pathway of the HDS of DBT (by a factor of 2 or less). 2-Methylpiperidine suppressed the hydrogenation by a factor of 10 to 50 but promoted the direct desulfurization of DBT at low partial pressures of 2-methylpiperidine. Both pathways were inhibited at high concentrations of 2-methylpiperidine. Structural and electronic factors may account for the promoting effect of 2-methylpiperidine.
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Egorova, M., Prins, R. Promotion Effect of 2-Methylpiperidine on the Direct Desulfurization of Dibenzothiophene over NiMo/γ-Al2O3 . Catalysis Letters 92, 87–91 (2004). https://doi.org/10.1023/B:CATL.0000014344.37981.9c
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DOI: https://doi.org/10.1023/B:CATL.0000014344.37981.9c