Effect of the second metal of Anderson type heteropolycompounds on hydrogenation and hydrodesulphurization properties of XMo6(S)/Al2O3 and Ni3-XMo6(S)/Al2O3 catalysts

The catalysts of the XMo6(S)/Al2O3 and Ni3-XMo6(S)/Al2O3 structures were prepared from heteropolycompounds (HPCs) of Anderson type (where X = Co, Ni, Cr, Mn, Fe, Cu, Zn, Ga). The precursors and synthesized catalysts were characterized by FTIR, XRD, EXAFS, HRTEM techniques. The prepared catalysts were examined in model reactions of thiophene HDS and benzene HYD and in hydrotreating (HDT) of diesel fraction. The correlations between the catalytic activities in HDS and HYD and the heats of thiophene adsorption depending on the nature of the heteroatom prove that it plays an important role in the formation and behavior of the HYD and HDS active sites. It was found that heteropolycompounds are effective precursors of a multilayered active phase of hydrotreating catalysts.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (146 K)Download as PowerPoint slideResearch highlights▶ The nature of a heteroatom of heteropolycompounds effects catalytic activity. ▶ Heteropolycompounds are effective precursors of a multilayered active phase. ▶ Heteroatom X optimizes electron density on the Mo atom. ▶ So it promotes productivities of the active sites in HDS and HYD reactions.