Ultra-deep hydrodesulfurization of 4,6-dimethyldibenzothiophene over Mo sulfide catalysts supported on TiO2-Al2O3 composite

Youssef Saih*, Kohichi Segawa

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Highly dispersed TiO2 supported on alumina surface were prepared utilizing chemical vapor deposition method. Mo/TiO2-Al2O3 (TiO2 10 wt %) was more active in the HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) than Mo/Al2O3 and Mo/TiO2 catalysts under mild operating conditions. The use of TiO2-Al2O3 composites as a support for Mo sulfide catalysts promoted the HDS pathway, whereby the initial hydrogenation of one of the benzene rings adjacent to the S atom reduced the steric hindrance caused by the two methyl groups, thus increasing the 4,6-DMDBT reactivity. XPS investigations of the Mo catalysts before and after sulfidation suggested that the interaction between Mo and Al2O3 was stronger than that between Mo and TiO2-Al2O3 composite. The results also suggested a higher reducibility from oxidic to sulfidic Mo species on TiO2-coated alumina supports. The number of active sites for HDS, known to be the sulfur vacancies that were also called coordinatively unsaturated sites, had probably increased on TiO2-Al2O3 composites.

Original languageEnglish (US)
Title of host publicationKing Fahd University of Petroleum and Minerals Research Institute Annual Catalysts in Petroleum Refining and Petrochemicals Symposium Papers
Pages1-5
Number of pages5
StatePublished - 2002
Externally publishedYes
Event12th Saudi-Japanese Symposium Catalysts in Petroleum Refining and Petrochemicals - Dhahram, Saudi Arabia
Duration: Dec 15 2002Dec 16 2002

Other

Other12th Saudi-Japanese Symposium Catalysts in Petroleum Refining and Petrochemicals
CountrySaudi Arabia
CityDhahram
Period12/15/0212/16/02

ASJC Scopus subject areas

  • Catalysis

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