Synthesis and Characterization of New nano catalyst Mo-Ni /TiO2- γAl2O3 for Hydrodesulphurization of Iraqi Gas Oil

Abstract

A new nano-sized NiMo/TiO2-γ-Al2O3 was prepared as a Hydrodesulphurization catalyst for Iraqi gas oil with sulfur content of 8980 ppm, supplied from Al-Dura Refinery. Sol-gel method was used to prepare TiO2- γ-Al2O3 nano catalyst support with 64% TiO2, 32% Al2O3, Ni-Mo/TiO-γ-Al2O3 catalyst was prepared under vacuum impregnation conditions to loading metals with percentage 3.8 wt.% and 14 wt.% for nickel and molybdenum respectively while the percentage for alumina, and titanium became 21.7, and 58.61 respectively. The synthesized TiO2- γ-Al2O3 nanocomposites and Ni-Mo /TiO2- γ-Al2O3 Nano catalyst were then characterized by XRD, AFM, and BET surface area, SEM, XRF, and FTIR. The performance of the synthesized catalyst for removing sulfur compounds was conducted through the pilot HDS laboratory unit, various temperatures range 275oC to 375°C, LHSV 1 h-1 were studied; moreover, the effect of LHSV 1 to 4 h-1 on the percentage of sulfur removal was also studied at the temperature of the best removal with constant pressure 35 bar and H2/HC ratio 200cm3/200cm3. The sulfur content results generally revealed that there was a substantial decrease at all operating conditions used, while the maximum sulfur removal was 87.75% in gas oil on Ni-Mo/TiO2-γ-Al2O3 catalyst at temperature 375˚C and LHSV 1h-1.

Synergistic Influence of Non-Thermal Plasma and Hydrogen Peroxide on Oxidative Desulfurization (ODS) of Model Fuel

“…The development of an effective desulfurization process for petroleum products is important in terms of environmental pollution, economy, product quality, and strict environmental laws. Using a variety of procedures, including hydrodesulfurization 7,8 . Oxidative desulfurization, bio-desulfurization 9 , deep eutectic solvent extraction, and adsorptive desulfurization 10 , desulfurization processes have been carefully studied 11 .…”

“…The oxidative desulfurization system oxidizes refractory sulfur compounds in fuel feedstocks in a series of steps to produce sulfones (first to the sulfoxide, then to the sulfone). Solvent extraction is used to remove the sulfones that result from the chemical conversion of reactive oxygen species in oxidants to sulfone molecules 13 , oxidative desulfurization appears to be a viable technology because of its potential benefits. A few of these are the lack of hydrogen, the low operating temperatures, and the strong oxidation reactivity of the most refractory sulfur-containing compounds, such dibenzothiophene, and its alkylated derivatives 14 .…”