Towards oxidative denitrogenation of fuel oils: Vanadium oxide-catalysed oxidation of quinoline and adsorptive removal of quinoline-N-oxide using 2,6-pyridine-polybenzimidazole nanofibers

Ogunlaja, Adeniyi S.; Abdul-quadir, M. S.; Kleyi, Phumelele; Ferg, E.E.; Watts, Paul; Tshentu, Zenixole R.

doi:10.1016/j.arabjc.2017.05.010

Cited by 25 publications

(25 citation statements)

References 39 publications

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“…The ODN process, in turn, has not been as extensively studied as ODS (as demonstrated in Figure 6). There is a broader range of possible reaction products than ODS during the oxidation of N-containing compounds due to the several bonds of N-compounds that are prone to oxidation [46]. For instance, quinoline (QN) oxidation gives reaction intermediates: 5-hydroxyquinoline and 8-hydroxyquinoline are the major products.…”

Section: Oxidative Desulfurization (Ods) and Denitrogenation (Odn)mentioning

confidence: 99%

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

et al. 2021

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Sulfur (S) and nitrogen (N) are elements naturally found in petroleum-based fuels. S- and N-based compounds in liquid fuels are associated with a series of health and environmental issues. Thus, legislation has become stricter worldwide regarding their content and related emissions. Traditional treatment systems (namely hydrodesulfurization and hydrodenitrogenation) fail to achieve the desired levels of S and N contents in fuels without compromising combustion parameters. Thus, oxidative treatments (oxidative desulfurization–ODS, and oxidative denitrogenation-ODN) are emerging as alternatives to producing ultra-low-sulfur and nitrogen fuels. This paper presents a thorough review of ODS and ODN processes applying carbon-based materials, either in hybrid forms or as catalysts on their own. Focus is brought to the role of the carbonaceous structure in oxidative treatments. Furthermore, a special section related to the use of amphiphilic carbon-based catalysts, which have some advantages related to a closer interaction with the oily and aqueous phases, is discussed.

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Section: Oxidative Desulfurization (Ods) and Denitrogenation (Odn)mentioning

confidence: 99%

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

et al. 2021

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“…The optimization of adsorption process in the present study has resulted in improved adsorption capacities much higher than those reported in our previous study. 38 PBI nanofibres gave slow kinetics reaching equilibrium at 480 min, this was probably due to surface area and porosity of functional nanofibres. However, our functional polymer compared well with the reported indole MIPs when selectively was considered (Table 8).…”

Section: Figure 13mentioning

confidence: 99%

Selective Removal of Organonitrogen Compounds in Fuel using Functional Polybenzimidazole Nanofibres: A Combined Experimental and Theoretical Study

et al. 2019

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Organonitrogen compounds present in fuel oils are deleterious to the environment as well as refining catalysts. Herein, functional polybenzimidazole (PBI) nanofibres fabricated in the presence of N-compounds (nitrogen-containing compounds) were employed for the selective adsorption of quinoline, pyrimidine and carbazole, largely found in diesel fuel. Adsorption capacities of 11.5 mg g-1 , 11.8 mg g-1 and 11.0 mg g-1 were observed for pyrimidine, carbazole and quinoline, respectively. Density functional theory (DFT) studies indicated ð-ð interactions/stacking and hydrogen bond interactions between the nitrogen atom of N-compounds and PBI. The study clearly shows the potential of PBI material use for the selective removal of organonitrogen compounds in fuels.

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“…The oxidation of nitrogen containing organic compounds such as quinoline does not necessarily oxidizes the nitrogen, however it is a complex reaction. Studies in literature [25] showed that the carbon with least electron density in the ring of organonitrogen compound is oxidized by peroxides and then followed by ring opening. Further oxidation will result in formation of various oxygenates of organonitrogen compounds, which can be then removed from gas oil via adsorption or extraction due to increase in polarity of oxygenated nitrogen compounds.…”

Section: Oxidative Desulfurization and Denitrogenationmentioning

confidence: 99%

“…Further oxidation leads to ring opening and formation of various oxygenated products of ketone and carboxylic acid category. A study by Ogunlaja et al [25] also reported the oxidation of nitrogen in quinoline to form of quinoline N-oxide. The oxidation follows the order indole > quinoline > acridine > carbazole.…”

Section: Introductionmentioning

confidence: 97%

“…The oxidation of nitrogen containing aromatic compounds such as quinoline, indole and carbazole is a complex reaction. According to the literature [24][25][26], it was found that the peroxide group oxidizes that carbon in aromatic ring, which is having least electron density to form -oxy or -oxyl compounds. Further oxidation leads to ring opening and formation of various oxygenated products of ketone and carboxylic acid category.…”

Section: Introductionmentioning

confidence: 99%

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Hydrotreatment Followed by Oxidative Desulfurization and Denitrogenation to Attain Low Sulphur and Nitrogen Bitumen Derived Gas Oils

et al. 2018

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To lower the sulphur content below 500 ppm and to increase the quality of bitumen derived heavy oil, a combination of hydrotreating followed by oxidative desulfurization (ODS) and oxidative denitrogenation (ODN) is proposed in this work. NiMo/γ-Al2O3 catalyst was synthesized and used to hydrotreat heavy gas oil (HGO) and light gas oil (LGO) at typical operating conditions of 370–390 °C, 9 MPa, 1–1.5 h−1 space velocity and 600:1 H2 to oil ratio. γ-Alumina and alumina-titania supported Mo, P, Mn and W catalysts were synthesized and characterized using X-ray diffractions, N2 adsorption-desorption using Brunauer–Emmett–Teller (BET) method, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). All catalysts were tested for the oxidation of sulphur and nitrogen aromatic compounds present in LGO and HGO using tert-butyl hydroperoxide (TBHP) as oxidant. The oxidized sulphur and nitrogen compounds were extracted using adsorption on activated carbon and liquid-liquid extraction using methanol. The determination of oxidation states of each metal using XPS confirmed the structure of metal oxides in the catalyst. Thus, the catalytic activity determined in terms of sulphur and nitrogen removal is related to their physico-chemical properties. In agreement with literature, a simplistic mechanism for the oxidative desulfurization is also presented. Mo was found to be more active in comparison to W. Presence of Ti in the support has shown 8–12% increase in ODS and ODN. The MnPMo/γ-Al2O3-TiO2 catalyst showed the best activity for sulphur and nitrogen removal. The role of Mn and P as promoters to molybdenum was also discussed. Further three-stage ODS and ODN was performed to achieve less than 500 ppm in HGO and LGO. The combination of hydrotreatment, ODS and ODN has resulted in removal of 98.8 wt.% sulphur and 94.7 wt.% nitrogen from HGO and removal of 98.5 wt.% sulphur and 97.8 wt.% nitrogen from LGO.

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Towards oxidative denitrogenation of fuel oils: Vanadium oxide-catalysed oxidation of quinoline and adsorptive removal of quinoline-N-oxide using 2,6-pyridine-polybenzimidazole nanofibers

Cited by 25 publications

References 39 publications

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

Selective Removal of Organonitrogen Compounds in Fuel using Functional Polybenzimidazole Nanofibres: A Combined Experimental and Theoretical Study

Hydrotreatment Followed by Oxidative Desulfurization and Denitrogenation to Attain Low Sulphur and Nitrogen Bitumen Derived Gas Oils

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