Research advances in the ultra deep desulfurization of diesel fuel

Lowering sulfur content of diesel fuel has an important significance on improving the quality of tail gas exhausted from automobiles and protecting the environment.The production of ultra low sulfur diesel mainly depends on hydrodesulfurization and non-hydrodesulfurization technologies.The mechanism of deep hydrodesulfurization and brings forward research gaps needed to be resolved is outlined.The deep hydrodesulfurization of diesel fules requires the decomposition of refractory compounds such as 4,6-dimethyldibenzothiophene(4,6-DMDBT).Design approaches to the catalysts of deep hydrodesulfurization are discussed.New research development in recent years on catalysts and processes of diesel deep hydrodesulfurization are also introduced.Moreover,the non-hydrodesulfurization methods by adsorption,oxidation,or biology are presented.The organic combination of hydrodesulfurization and non-hydrodesulfurization technologies has a promising prospect in the production of ultra low sulfur diesel.