Effect of sulfiding pressure on the formation of the Ni site on View the MathML source and View the MathML source

The effect of sulfiding pressure on the surface structure of NiMo View the MathML source was investigated in the range of 0.1 to 5.1 MPa by in-situ FT-IR/DRA of adsorbed NO. The distribution of the Ni site and Mo (or W) site on the surface of every catalyst examined was sensitive to the sulfiding pressure. In the View the MathML source catalyst, the intensity of the Mo site-band was weaker when the catalyst was sulfided at a pressure above 1.1 MPa than when sulfided at 0.1 MPa, while the Ni site-band was insensitive to the sulfiding pressure. On the other hand, in the View the MathML source catalyst, the W site-band could not be discriminated distinctly in the range of 0.1 to 5.1 MPa and the Ni site-band sensitively decreased with increasing the sulfiding pressure. Comparing the results with those of the physical mixture of View the MathML source and View the MathML source, it was suggested that sulfiding induces the interaction between Ni and Mo in View the MathML source (or W in View the MathML source), and that the interaction between Ni and Mo was promoted by higher pressure sulfiding above 1.1 MPa.