A 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 ...A 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℃ and a constant pressure of 435 psi. The HDS conversions of DBT and 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 hydrogenation- desulphurization （HYD） pathway. Although the catalyst showed up to 24% hydrogenation/dehydrogenation con- version oftetralin, it had low conversion and selectivity for ring opening and contraction due to the competitive adsorption of DBT and 4,6-DMDBT and insufficient acidic sites on the catalyst surface.展开更多
文摘A 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℃ and a constant pressure of 435 psi. The HDS conversions of DBT and 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 hydrogenation- desulphurization （HYD） pathway. Although the catalyst showed up to 24% hydrogenation/dehydrogenation con- version oftetralin, it had low conversion and selectivity for ring opening and contraction due to the competitive adsorption of DBT and 4,6-DMDBT and insufficient acidic sites on the catalyst surface.
