期刊
JOURNAL OF CATALYSIS
卷 242, 期 1, 页码 207-216出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2006.06.009
关键词
hydrodesulfurization; 4,6-dimethyldibenzothiophene; dibenzothiophene; platinum; palladium; Pt-Pd catalysts
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. (c) 2006 Elsevier Inc. All rights reserved.
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