Synthesis of high-surface-area Co-O-Si complex oxide for skeletal isomerization of 1-hexene and hydrodesulfurization of thiophene

The coprecipitation of sodium silicate with cobalt nitrate, combined with an n-butanol drying process, led to the formation of a Co-O-Si complex oxide (Co/Si atomic ratio ≈ 0.65) with atomically dispersed Co and Si atoms. The complex oxide had a high surface area (562 m2/g) and strong surface acidity. Sulfidation resulted in the formation of highly dispersed cobalt sulfide, which had high activity in the hydrodesulfurization (HDS) of thiophene (99.4%) and skeletal isomerization of 1-hexene (35%) at 573 K. The HDS activity was as high as that of the industrial catalyst Co-Mo/γ-Al2O3, although no Mo was present. The material could therefore be used for the skeletal isomerization of linear olefins during deep HDS of gasoline to reduce octane number loss caused by olefin saturation.

Graphical AbstractA Co-O-Si complex oxide containing 34 wt% Co was prepared by coprecipitation of Na2SiO3 and Co(NO3)2. It had a high surface area (562 m2/g), with highly dispersed Co and Si. After sulfidation, the catalyst (CS10) exhibited high activity in hydrodesulfurization (HDS) of thiophene (99.4%) and skeletal isomerization of 1-hexene (35%) at 573 K. It could therefore be used for the skeletal isomerization of linear olefins during deep HDS of gasoline, to reduce octane number loss caused by saturation of olefins.Figure optionsDownload as PowerPoint slide