Highly catalytic oxidative desulfurization and denitrogenation of diesel using anchored-silica-gel vanadium-substituted Dawson-type polyoxometalate

Abstract

The aim of this article is to study the extractive-catalytic oxidative desulfurization (ECODS) of the model oil containing several model S-containing compounds as well as N-containing compound using a heterogeneous vanadium substituted Dawson-type polyoxometalate catalyst under atmospheric pressure and temperature lower than 100 o C. The catalyst was prepared by ion exchange with alkyl ammonium derivatives covalently anchored to silica gel.The potential of this methodology was illustrated by oxidation of 100% quinoline and 80% of total sulfur in model oil containing 500 ppmw sulfur and 70% of total sulfur in model oil 1500 ppmw in less than 30 minutes of reaction, in the absence of solvent. However, when acetonitrile was employed as an extractive solvent, the desulfurization was increased considerably. Under the reaction conditions, activated catalyst and acetonitrile, solvent to oil ratio 1:6, could remove approximately 100% of quinoline, 95% of sulfur from 500-ppmw model oil, 87% of sulfur from 1500-ppmw model oil in less than 30 min. The catalyst is very active in ECODS and can be reused fifth times from 500-ppmw model oil and third times from 1500-ppmw model oil without an important decrease in activity. The ECODS could remove 83% of total sulfur from 1235-ppmw-S real diesel.

Batch Oxidative Desulfurization of Model Light Gasoil over a Bimetallic Nanocatalyst

“…To investigate the catalytic performance of the nanocatalyst, batch ODS reactions were carried out following previously published methodologies [20,26,40]. The operating variables, such as reaction temperature, reaction time, catalyst dose, and oxidant flow rate, were carefully optimized for safe conditions and sulfur removal efficiency.…”

“…Hence, the effect of reaction time on the conversion of DBT by Cat-ODS was optimized. Three time periods (20,40, and 60 min) were considered in batch Cat-ODS of the model LGO. As shown in Fig.…”

“…In petroleum refineries, the removal of organic sulfur from petroleum distillates such as diesel fuel is mainly achieved by conventional hydrodesulfurization (HDS). However, due to its severe operating conditions in terms of high reaction temperature and pressure, HDS has high operating costs and is less effective in eliminating refractory sulfur compounds; hence, it may not be the optimum desulfurization process [19,20]. Recently, sophisticated technologies such as catalytic oxidative desulfurization (Cat-ODS), selective adsorption, biodesulfurization, and oxidation-extraction have been used for the production of ultralow-sulfur fuels [21][22][23].…”

Ultra‐deep catalytic adsorptive desulfurization of diesel fuel using Ti‐silica gel adsorbent at low Ti‐loading

“…Sulfur oxides (SO x ) emission from the combustion of transportation fuels has attracted much attention due to the environmental destruction and threat to human health 1–3 . To mitigate the air pollution (e.g., haze and acid rain) caused by toxic SO x , stringent regulations are implemented to limit the S‐concentration in the diesel fuel to less than 15 or 10 ppm‐S 4,5 . Even lower sulfur concentrations are required in proton‐exchange membrane fuel cell (<1 ppm‐S), solid oxide fuel cell (<3 ppm‐S), and so forth 6–8 .…”

Liquid Polymer Eutectic Mixture for Integrated Extractive-Oxidative Desulfurization of Fuel Oil: An Optimization Study via Response Surface Methodology

“…Some of the non-conventional ways to remove sulfur are currently being tested including biodesulfurization (BDS) [3][4][5], adsorptive desulfurization (ADS) [6][7][8], extractive desulfurization (EDS) [9][10][11][12], and oxidative desulfurization (ODS) [13,14]. Compared to BDS and ADS, EDS could be operated at mild conditions with the use of suitable extractant to desulfurize fuel oil.…”