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TitleHDS of dibenzothiophenes and hydrogenation of tetralin over SiO2 supported Ni-Mo-S catalyst
AuthorWei, Q; Chen, J; Song, C; Li, G
SourceFrontiers of Chemical Science and Engineering vol. 9, no. 3, 2015 p. 336-348, https://doi.org/10.1007/s11705-015-1535-1
Year2015
PublisherSpringer Nature
Documentserial
Lang.English
Mediaon-line; digital
File formatPDF
Subjectsenergy; oil sands; crude; GHG; modeling; modeling and simulation; simulation; upgrading
Illustrationsgraphs; tables
ProgramProgram of Energy Research and Development (PERD)
Released2015 09 09
AbstractA one-step synthesized Ni-Mo-S catalyst supported on SiO2 was prepared and used for hydrodesulphurization (HDS) of dibenzothiophene (DBT), and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT), and for hydrogenation of tetralin. The catalyst showed relatively high HDS activity with complete conversion of DBT and 4,6-DMDBT at temperature of 280 °C and a constant pressure of 435 psi. The HDS conversions of DBTand 4,6-DMDBT increased with increasing temperature and pressure, and decreasing liquid hourly space velocity (LHSV). The HDS of DBT proceeded mostly through the direct desulphurization (DDS) pathway whereas that of 4,6-DMDBT occurred mainly through the hydrogenationdesulphurization (HYD) pathway. Although the catalyst showed up to 24% hydrogenation/dehydrogenation conversion of tetralin, it had low conversion and selectivity for ring opening and contraction due to the competitive adsorption of DBTand 4,6-DMDBT and insufficient acidic sites on the catalyst surface.
Summary(Plain Language Summary, not published)
A one-step synthesized NiMoS2/SiO2 catalyst was used for hydrodesulphurization of dibenzothiophene (DBT), and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT), and for hydrogenation of tetralin. The catalyst was non-acidic and the results reflected the activity of sulphur compounds on the active sites of the catalyst. The experimental results showed that the catalyst had a high activity and was not deactivated during the tests. DBT and 4,6-DMDBT were completely desulphurized at reaction temperatures of 270 and 280oC, respectively, with constant operating pressure of 435 psi. The desulphurization conversion of DBT and 4,6-DMDBT increased with increasing reaction temperature and pressure, and with decreasing liquid hourly space velocity (LHSV). The direct desulphurization (DDS) selectivity of DBT was much higher than that of 4,6-DMDBT, indicating that the HDS of DBT was carried out via the DDS pathway at active non-acidic metal sites whereas the HDS of 4,6-DMDBT was achieved via the hydrogenation desulphurization (HY-DS) pathway. The hydrogenation conversion of tetralin was low compared to other published studies with acidic supported catalysts. The selectivity of hydrogenation (ring opening/contraction) for tetralin had the same trend as that of HDS for S-containing compounds as the reaction conditions changed. The hydrogenation selectivity of tetralin increased with increasing pressure and temperature. Although the DDS reaction of DBT showed that the cleavage of C-S bond did not need acid sites, the low hydrogenation conversion of tetralin was due to not only the competitive adsorption with S-containing compounds but also the lack of acid sites.
GEOSCAN ID298914