Abstract
The activity and selectivity of alumina-supported Pt, Pd, and Pt-Pd in the hydrodesulfurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DM-DBT) were investigated, and all final, hydrocarbon products and partially hydrogenated intermediates were analyzed. Pd had a high activity in the hydrogenation of 4,6-DM-DBT, whereas the removal of sulfur from DBT and 4,6-DM-DBT and their intermediates occurred faster over Pt than over Pd. Bimetallic Pt-Pd catalysts were much more active than the combination of their monometallic constituents, proving a chemical synergism between the noble metals and the presence of alloyed particles. New sites with high hydrogenation activity explain why the hydrogenation of the products 3 , 3 ′ -dimethylcyclohexylbenzyl and 3 , 3 ′ -dimethylbiphenyl in the HDS of 4,6-DM-DBT, as well as the hydrogenation of 3 , 3 ′ -dimethylbiphenyl in the presence of DBT, were significant only over the Pt-Pd catalysts. In contrast to the metal sulfide catalysts, the hydrogenation route over the noble metal catalysts was faster for 4,6-DM-DBT than for DBT, which almost compensated for the loss of activity via the desulfurization pathway.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
