Hydrodesulfurization of dibenzothiophene using CoMo/Al-HMS nanocatalyst synthesized by supercritical deposition

The developed CoMo/Al-HMS nanocatalyst (3.4 wt% Co and 9.4 wt% Mo) via supercritical methanol–carbon dioxide deposition was characterized by different techniques (adsorption–desorption of nitrogen, oxygen chemisorption, XRD, TPR, TEM and EDAX) and tested in the hydrodesulfurization of dibenzothiophene. The results indicated that supercritical impregnation of Co and Mo into support has a positive effect on the catalyst activity. The higher catalyst performance is attributed to higher and more uniform dispersed deposition of the catalytic metals on the support with increased active surface area. The results of hydrodesulfurization of dibenzothiophene demonstrated enhanced activity for the new catalyst in terms of increased conversion, selectivity and rate constant. Furthermore, addition of aromatics in the feed showed less inhibition effect of CoMo/Al-HMS nanocatalyst with respect to the commercial catalyst.

Graphical abstractThe developed CoMo/Al-HMS nanocatalyst by supercritical deposition was tested in the HDS of DBT and the results revealed higher activity compared to the commercial catalyst. The higher obtained performance for the new nanocatalyst is due to increased Mo and Ni uniform dispersed deposition on the Al-HMS support, and higher reaction rate constant and conversion.Figure optionsDownload full-size imageDownload as PowerPoint slide