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2015, Volume 9, Issue 3

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Frontiers of Chemical Science and Engineering >> 2015, Volume 9, Issue 3 doi: 10.1007/s11705-015-1535-1

HDS of dibenzothiophenes and hydrogenation of tetralin over a SiO

1. Natural Resources Canada, CanmetENERGY-Devon, One Oil Patch Drive, Devon, AB, T9G IA8, Canada. 2. Energy, Mining & Environment, National Research Council Canada, 4250 westbrook Mall, Vancouver, BC, V6J 1W5, Canada

Accepted: 2015-09-24 Available online: 2015-09-30
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Abstract

A one-step synthesized Ni-Mo-S catalyst supported on SiO 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 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 conversion of tetralin, 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.

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