One-pot Solvothermal Preparation of the Porous NiS2//MoS2 Composite Catalyst with Enhanced Low-Temperature Hydrodesulfurization Activity

The simple preparation of mesoporous NiS2//MoS2 composite catalyst through a one-pot solvothermal method is presented. The improvement of the specific surface area (220 m(2)/g) and the construction of the porous structure are realized by this method in the case of no support. The organics acts as a microscopic binder contribute to uniform stacking of MoS2 with NiS, clusters. The composite structure including NiS, and MoS2 was obtained (proved by XRD, XPS, TEM, IR, UV-vis and RAMAN) and changed the microelectronic environment of the active metal surface (DFT calculation). The mesoporous NiS ₂//MoS2 catalyst (Ni, Mo ₁-200) showed an excellent hydrodesulfurization performance of dibenzothiophene (DBT conversion: 78 % at 260 degrees C) and a high ratio of direct desulfurization pathway (SDDS/HYD 16.6) at a low reaction temperature. By combining the character- ization and theoretical calculation results, the advantages of this NiS ₂//MOS, composite structure in synergistic catalysis was further confirmed.