Effect of Ni/Mo on the preparation of non-loaded NiMoSx catalysts and the hydrogenation performance of coal tar

Abstract

Efficient and clean utilization of coal tar is one of the key technologies for efficient and clean utilization of coal. Molybdenum disulfide has been favored for its superior catalytic hydrogenation of poor-quality oil. Molybdenum disulfide catalysts doped with different contents of nickel were synthesized by a two-step method. By SEM, XRD, Raman analyses, and other analyses. non-loaded NiMoSx-0.1 catalysts with larger lateral dimensions, fewer layers, and the appearance of specific active sites at both Basal and Edge positions were synthesized when Ni/Mo = 0.1 compared to undoped molybdenum disulfide. When Ni/Mo is continuously increased, the conversion of the intermediate MoS4-xOx is severely affected, which decreases the amount of MoS2 generated and increases the number of MoS2 layers and transverse dimensions. NiMoSx-0.1 promotes the conversion of CA to CN and enhances the hydrogenation and cracking of coal tar. The total gasoline and diesel content of the hydrotreating product was increased by 13.6 % with no coke production, in addition to the viscosity, density, and average molecular mass decreasing by 90 %, 5 %, and 33 %, respectively.