Investigation of Oxidative Desulfurization of Light Naphtha by NiMo/𝛾-Al2O3 Catalyst

Document Type: Research Article

Authors

1 science department, science and research branch, islamic azad university, tehran, iran

2 Department of Chemistry, Tehran Science and Research Branch, Islamic Azad University of, Tehran, I.R. IRAN

3 Department of chemistry, Islamic Azad University,Buinzahra Branch,Buinzahra,Iran

Abstract

In this research, we investigated the effects of parameters, including reaction time, reaction temperature, mass ratio (mcat./mfeed), and volume ratio (VH2O2/Vfeed) on sulfur removal conversion of light naphtha under oxidative desulfurization (ODS) reaction. So to achieve this goal, several active catalysts are prepared while molybdenum (Mo) was used as an active metal. Nickel (Ni) was the promoter. 𝛾-alumina (𝛾-Al2O3) was used as a support and modified by chelate agents such as citric acid (C6H8O7), ethylene diamine tetra acetic acid (EDTA), poly ethylene glycol (PEG), Sorbitol, and urea ((NH4)2CO). These catalysts were synthesized by using wetness impregnation in-situ method. Then they were applied to the ODS process for light naphtha. These catalysts were characterized by N2-adsorbtion desorption isotherms (BET, BJH), scanning electron microscope (SEM), temperature programmed desorption (NH3-TPD) and FTIR analysis. The catalyst that synthesized in the presence of sorbitol, had the best performance. The optimization conditions for this catalyst were m (catalyst)/m (feed)= 0.013, reaction temperature of 35 °C, 50 mL of feed, 0.5 g of catalyst, 1 hour reaction time, and V (H2O2)/VFeed = 0.045. It revealed the maximum performance for ODS reaction of the real feed. Under these circumstances, the sulfur of light naphtha decreased from 160 ppm to 38 ppm during the reaction.

Keywords