The Effects Of Ph And Chelating Agent On Synthesis And Characterization Of Ni Mo/Gamma-Alumina Nanocatalyst For Heavy Oil Hydrodesulfurization

In this research, various organic additives (as a chelating agent) were used to prepare NiMo/gamma-Al2O3 bimetallic catalysts. Then effects of additives and pH variation were studied on textural properties, morphology and size of nanocatalyst particles, interaction, and loading of active metals on a support. Additionally, this research evaluated the activity of catalysts and compared them with commercial and catalysts in the absence of additives. The metal oxide nanoparticles were prepared and impregnated on gamma-Al2O3 in-situ by using the wetness impregnation method, under conditions 60 degrees C and calcination temperature 520 degrees C. The supported nanocatalyst was calcined to remove the volatile materials and gases. The catalysts were characterized by TPR, BET, BJH, AAS, FT-IR, SEM, and XRD. The prepared nanocatalyst displayed the enhanced catalytic activity for the heavy oil hydrodesulfurization (HDS) containing 21 g/L sulfur. At the acidic pH, the activity of the catalyst was promoted by using EDTA compound as a chelating agent. The sulfur content of the feed was decreased up to 2 g/L at 380 degrees C, 60 bar, and LHSV 1.5h(-1) showing an efficient catalyst with the conversion of 90.47%.