Desulphurization of diesel fuels using intermediate Lewis acids loaded on activated charcoal and alumina

Mguni, Liberty L.; Yao, Yali; Nkomzwayo, Thulisile; Liu, Xinying; Hildebrandt, Diane; Glasser, David

doi:10.1080/00986445.2018.1511983

Cited by 22 publications

(6 citation statements)

References 36 publications

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“…This high concentration of Brönsted acid sites can be attributed to AC surface functional groups, which act as proton donors that are thermally degraded during calcination. The intermediate Lewis acid sites of the Ni 2+ ions are classified as electrophiles, while the sulfur compounds in model diesel are intermediate Lewis bases and act as nucleophiles . Therefore, an increase in the Lewis acidity of the adsorbent would lead to increased acid–base interactions during adsorption, thus enhancing sulfur uptake during desulfurization.…”

Section: Resultsmentioning

confidence: 99%

“…The intermediate Lewis acid sites of the Ni 2+ ions are classified as electrophiles, while the sulfur compounds in model diesel are intermediate Lewis bases and act as nucleophiles. 42 Therefore, an increase in the Lewis acidity of the adsorbent would lead to increased acid−base interactions during adsorption, thus enhancing sulfur uptake during desulfurization. S2a).…”

Section: Adsorbent Characterization 311 Bet Analysismentioning

confidence: 99%

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Competitive Adsorption in a Multicomponent Diesel System Using Nickel Oxide/Activated Carbon

Nkomzwayo

Mguni

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Nickel oxide, which acts as an intermediate Lewis acid, was loaded onto activated carbon (AC) to enhance the adsorption selectivity of AC in the desulfurization of model diesel. The total sulfur adsorption capacity increased from 2.46 to 4.42 mg-S•g adsorbent −1 and the total sulfur removal increased from 46.8 to 84.5% using the AC and Ni (10%) O/ AC adsorbents, respectively. Multicomponent isothermal modeling showed that the incorporation of NiO onto AC significantly improved the synergistic interactions between the thiophenic compounds while mitigating competitive interactions between the more steric 4,6-dimethyl dibenzothiophene (4,6-DMDBT) and 4-methyl-dibenzothiophene (4-MDBT) compounds. The mitigation was attributed to new adsorbatespecific sites created by loading NiO on AC. Spent adsorbent characterization and pyridine adsorption-IR analysis suggested that higher desulfurization performance of the Ni (10%) O/AC adsorbent was attributed to an increase in the adsorbent's Lewis acidity upon loading with NiO, leading to increased Ni−S acid−base interactions, in addition to π-complexation.

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Section: Resultsmentioning

confidence: 99%

Section: Adsorbent Characterization 311 Bet Analysismentioning

confidence: 99%

Competitive Adsorption in a Multicomponent Diesel System Using Nickel Oxide/Activated Carbon

Nkomzwayo

Mguni

Liu

et al. 2023

Ind. Eng. Chem. Res.

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“…67,84 The smaller size of the Th molecule also enabled it to penetrate deeply and without steric hindrance into the pore channel of (1.00) Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) under the attraction of the active sites in the core−shell synergy. 85 The Th molecules tended to lean toward organic linkers, and the dispersion interaction of Th with organic linkers compensated well for the partial loss of electrostatic interaction between open active sites and Th. In addition, the hardness of the adsorbent surface varied with the loaded metal ions, which had a significant impact on the adsorption of TSCs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Cu 2+ desorption from the activated carbon surface required 69 kJ/mol, whereas Ni 2+ required 75 kJ/mol, which was consistent with the phenomenon that (0.50) Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) had a stronger adsorption ability toward DBT . On the other hand, (1.00) Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) with a higher Cu 2+ content exhibited a significantly larger specific surface area, exposing more effective active sites and promoting Th adsorption. , The smaller size of the Th molecule also enabled it to penetrate deeply and without steric hindrance into the pore channel of (1.00) Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) under the attraction of the active sites in the core–shell synergy . The Th molecules tended to lean toward organic linkers, and the dispersion interaction of Th with organic linkers compensated well for the partial loss of electrostatic interaction between open active sites and Th.…”

Section: Resultsmentioning

confidence: 99%

Boosting the Adsorption Performance of Thiophenic Sulfur Compounds with a Multimetallic Dual Metal–Organic Framework Composite

Fang

Zou

et al. 2022

Langmuir

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Adsorptive desulfurization over metal−organic frameworks (MOFs) remains a challenge in maintaining good performance in the presence of water. Herein, multimetallic Fe/ Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) is first achieved through phase-competition-driven growth technology. The adsorption performance of thiophene (Th), benzothiophene (BT), and dibenzothiophene (DBT) in model fuels is systematically investigated at mild temperature and follows the order Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) > MOF-5 > MIL-88B. Excellent adsorptive activity is mainly ascribed to the associative effects of multimetal active sites, suitable pore sizes and shapes, acid−base interactions, and complexation. Meanwhile, MIL-88B exhibits a "brick-wall" effect and effectively enhances the water stability of Fe/Ni/ Cu/Zn-(MIL-88B)-on-(MOF-5) more than does MOF-5. Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) exhibits superior stability even after being immersed in water for 5 days, maintaining 77, 77, and 81% of the initial DBT, BT, and Th uptake capacities. After five periods of regeneration, more than 90% of the desulfurization capacity of Fe/Ni/Cu/Zn-(MIL-88B)-on-(MOF-5) was recovered. This work provides a new strategy for the synthesis of desirable MOF-on-MOF, promoting its potential application to adsorption desulfurization.

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“…All of which are found in fuels [9,01]. Desulfurization using solvent extraction [00], adsorption [12,13], photo-oxidation [14], and ionic liquid desulfurization was developed as an alternative to hydrodesulfurization to decrease the sulfur content of petroleum products [15]. Adsorption desulfurization is considered one of the most promising methods for many reasons, such as requiring mild operating conditions, producing a good desulfurization effect, and providing high selectivity to thiophene compounds [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Desulfurization of Real Diesel Fuel onto Mesoporous Silica MCM-41 Implementing Batch Adsorption Process: Equilibrium, Kinetics, and Thermodynamic Studies

Kadhum¹,

Albayati²

2022

ETJ

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Desulphurization of diesel fuels using intermediate Lewis acids loaded on activated charcoal and alumina

Cited by 22 publications

References 36 publications

Competitive Adsorption in a Multicomponent Diesel System Using Nickel Oxide/Activated Carbon

Competitive Adsorption in a Multicomponent Diesel System Using Nickel Oxide/Activated Carbon

Boosting the Adsorption Performance of Thiophenic Sulfur Compounds with a Multimetallic Dual Metal–Organic Framework Composite

Desulfurization of Real Diesel Fuel onto Mesoporous Silica MCM-41 Implementing Batch Adsorption Process: Equilibrium, Kinetics, and Thermodynamic Studies

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