The Effects of pH and Chelating Agent on Synthesis and Characterization of Ni Mo/γ- Alumina Nanocatalyst for Heavy Oil Hydrodesulfurization

In this research, various organic additives (as a chelating agent) were used to prepare NiMo/ 𝛾-Al۲O۳ 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 𝛾-Al۲O۳ in-situ by using the wetness impregnation method, under conditions ۶۰°C and calcination temperature ۵۲۰°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 ۲۱ 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 ۲ g/L at ۳۸۰°C, ۶۰ bar, and LHSV ۱.۵h-۱ showing an efficient catalyst with the conversion of ۹۰.۴۷%.

کلیدواژه ها:

molybdenum oxide ، Nickel oxide ، Nanostructures ، Hydrodesulfurization ، Chelating agent ، Heavy oil