Abstract
The effect of boron addition was studied on the surface structure of Co-MoS 2/Al 2O 3 catalysts prepared by an impregnation technique. A chemical vapor deposition (CVD) technique using Co(CO) 3NO was applied to evaluate the maximum potential hydrodesulfurization (HDS) activity of the catalysts, the extent of blocking of MoS 2 edges by cobalt sulfides, and the coverage of Co on the MoS 2 edges. The catalysts were characterized by means of UV–vis spectroscopy and magnetic susceptibility measurements. The addition of boron decreased the catalytic activity of Co-MoS 2/Al 2O 3 for the HDS of thiophene, irrespective of calcination and Co loading. However, the extent of increased HDS activity of Co-MoS 2/Al 2O 3 from the addition of Co using the CVD technique was greater for the boron-containing catalysts than for the corresponding boron-free catalysts. Characterization by the CVD technique showed that boron significantly increased the extent of blocking and decreased the Co coverage on MoS 2 edges. The surface structure of uncalcined Co-MoS 2/Al 2O 3 catalysts estimated by use of the CVD technique was substantiated by the magnetic property of Co.
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