ChemInform Abstract: Effect of the Support on the Structure of Mo-Based Hydrodesulfurization Catalysts: Activated Carbon versus Alumina.
Abstract
The structure of oxidic and sulfided Mo catalysts supported on activated carbon has been investigated by XPS, temp.-programmed sulfiding (TPS), and chemical sulfur analysis, and the results are compared with those reported in the literature for Mo/Al2O3 catalysts.
ChemInform Abstract
The structure of oxidic and sulfided Mo catalysts supported on activated carbon has been investigated by XPS, temp.-programmed sulfiding (TPS), and chemical sulfur analysis, and the results are compared with those reported in the literature for Mo/Al2O3 catalysts. At Mo loadings below 3 wt.%, the oxidic Mo phase is highly dispersed on carbon as isolated or polymerized monolayer species, whereas small three-dimensional particles are present at higher loadings. Upon sulfiding particle growth occurs, although the particle size remains below 4.6 nm even at high loadings. Only Mo(IV) is detected in the sulfided samples and MoS2 is found to be the major phase present after sulfidation. The higher catalytic activity for sulfided Mo/C compared to Mo/Al2O3 is explained by the absence of strong interactions with the carbon support.
