Recent Progress in the Research of  Ultra-deep Hydrodesulfurization of Diesel Fuels  


Ultra-Deep Hydrodesulfurization of Diesel Fuels on Trimetallic NiMoW Sulfide Catalysts

Lu Wang, Yongna Zhang, Yuliang Zhang, Zongxuan Jiang*, Can Li* 

Published online on October 27, 2009.  DOI: 10.1002/chem.200901997 

Keywords: Ultra-deep Hydrodesulfurization 4,6-dimethyldibenzothiophene (4,6-DMDBT) Diesel NiMoW Sulfide Catalyst


Developing ultra-deep hydrodesulfurization (HDS) catalysts with super high activity has been one of the most challenging and important subjects because increasingly stringent environmental regulations for the sulfur content in diesel fuels have been enacted throughout the world. A novel tri-metallic NiMoW catalyst was prepared by a surfactant-assisted co-precipitation method using hydrotalcite-like basic nickel carbonate as the nickel source. The NiMoW-3 exhibits much higher overall rate constant than the CoNiMoW/Al2O3 commercial catalysts for the HDS of 4,6-DMDBT and the apparent activation energy correspondingly decreases from 176 kJ•mol-1 to 140 kJ•mol-1. In the HDS of actual diesel, the sulfur content could be lowered from about 1400 ppm to less than 1 ppm. The characterization results show that the NiMoW sulfide catalyst has unique multi-layered structure, in which the Ni7S6 with layered structure acts as a support and Mo, W or MoW sulfide particles are deposited on the surface and interlayer galleries of the Ni7S6 support. It is proposed that Mo-W-S species deposited on Ni7S6 support may generate the highly active sites for the HDS.