Evaluation of the impact of zeolites on the performance of Diesel Hydrodesulfurization catalysts

The removal of sulfur-containing compounds (SCCs) from oil cuts, in particular diesel, is considered a global environmental issue due to the negative impacts of combustion products of diesel fuel on human health. Among the various desulfurization methods, Hydrodesulfurization is known as an effective method for the complete removal of SCCs from diesel fuel. Nonetheless, there has been a great interest in the development of a new generation of highly efficient HDS catalysts to respond to stricter environmental regulations and prevent poisoning of expensive catalysts used in other units. In the meantime, zeolite catalysts are of considerable importance in chemical reactions occurring in chemical, petrochemical, and oil refining industries. This paper reviews recent advances and achievements on catalysts mixed with zeolites in the HDS process due to its high capacity in the removal of highly stable SCCs such as 4, 6 dimethyldibenzothiophene and improvement of the performance of HDS catalysts.