Oxidation of refractory sulfur compounds with molecular oxygen over a Ce-Mo-O catalyst

Oxidation of refractory sulfur compounds with molecular oxygen over a Ce-Mo-O catalyst

Green Chem., 2016, Advance Article
DOI: 10.1039/C6GC01357K, Paper

Yawei Shi, Guozhu Liu, Bofeng Zhang, Xiangwen Zhang
A Ce-Mo-O catalyst showed remarkable performance for aerobic oxidative desulfurization without sacrificial agents at 100 [degree]C and atmospheric pressure.

Oxidation of refractory sulfur compounds with molecular oxygen over a Ce–Mo–O catalyst

Yawei Shi,^a   Guozhu Liu,*^a   Bofeng Zhang^a and  Xiangwen Zhang*^a  

*

Corresponding authors

^a

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Centre of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
E-mail: gliu@tju.edu.cn, zhangxiangwen@tju.edu.cn
Fax: +86 22 27892340
Tel: +86 22 27892340

Green Chem., 2016, Advance Article

DOI: 10.1039/C6GC01357K

http://pubs.rsc.org/en/Content/ArticleLanding/2016/GC/C6GC01357K?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FGC+%28RSC+-+Green+Chem.+latest+articles%29#!divAbstract


A Ce–Mo–O catalyst prepared by a simple sol–gel method was proved to be highly active for aerobic oxidative desulfurization. Almost complete conversions of dibenzothiophene and 4,6-dimethyldibenzothiophene were achieved without any additional sacrificial agent at 100 °C and atmospheric pressure, and the conversion of benzothiophene could reach 97%. Reusability of the catalyst was also conducted, and >99% conversions could be achieved in three consecutive runs. As supported by carefully-designed control experiments, oxygen was activated by Ce species in the catalyst first, forming some reactive oxygen species, which oxidized DBT into DBTO₂ with the assistance of Mo species. Furthermore, selective quenching experiments indicated the generation of superoxide species during the reaction.





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