Performance of CoMoS/Al2O3 prepared by sonochemical and chemical vapor deposition methods in the hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene

• Published in: Applied catalysis. B, Environmental Vol. 58; no. 1-2; pp. 89 - 95
• Main Authors: Lee, Jung Joon, Kim, Heeyeon, Koh, Jae Hyun, Jo, Ara, Moon, Sang Heup
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 08.06.2005
• Subjects: 4,6-Dimethyldibenzothiophene; Chemical vapor deposition; Dibenzothiophene; Hydrodesulfurization; Sonochemistry; 4,6-Dimethyldibenzothiophene; Sonochemistry; Chemical vapor deposition; Hydrodesulfurization; Dibenzothiophene
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2004.12.001

Highly dispersed CoMoS/Al2O3 was prepared by dispersing MoS2 crystallites on Al2O3 by a sonochemical method, followed by the selective deposition of Co on the resulting MoS2 crystallites. The newly prepared catalyst contained larger amounts of CoMoS phase, a known active site for hydrodesulfurization (HDS), than a catalyst prepared by sequential impregnation and, as a result, exhibited a two to three times higher activity than that of the impregnated one for the HDS of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). The former catalyst promoted hydrogenation (HYD) route to a greater extent than direct desulfurization (DDS) route. Therefore, the extent of activity increase for the new catalyst was larger for 4,6-DMDBT HDS, which proceeds largely via the HYD route, than for DBT HDS, which proceeds largely by DDS.