Adsorptive desulfurization using period 4 transition metals oxide: A study of Lewis acid strength derived from the adsorbent ionic-covalent parameter

Nkomzwayo, Thulisile; Mguni, Liberty L.; Hildebrandt, Diane; Yao, Yali

doi:10.1016/j.cej.2022.136484

Cited by 18 publications

(9 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The improvement in the adsorption activity upon the addition of Ni has been observed in different systems such as zeolite, , MOFs, aluminosilicates, and carbon materials . Our previous study on ADS using period four transition metal oxides showed that the NiO-modified adsorbents have a higher selectivity for sulfur removal, and it also indicated a direct relationship between metal acidity and sulfur adsorption selectivity …”

Section: Introductionmentioning

confidence: 92%

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

Nkomzwayo

Mguni

Liu

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 92%

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

Nkomzwayo

Mguni

Liu

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Two isotherm models, Langmuir and Freundlich, were plotted in Figure 8, with mathematical eqs 5 and 6, respectively. where R L indicates adsorption favorability, K L is a constant to reflect the energy of adsorption and affinity of the binding sites (L/mg), and C 0 (mg/L) is the initial concentration of the analytes 6) where q e (mg/g) is a number of analytes on the absorbent's surface, n and K F (mg/g) are the constants to reflect the adsorption intensity and capacity, and C e is the concentration of DBT at equilibrium in solution (mg/L). Langmuir clarifies that the ADS of DBT occurs on homogeneous active surfaces of the adsorbent with uniform adsorption energy between adsorbates.…”

Section: ■ Adsorption Isothermsmentioning

confidence: 99%

“…Numerous adsorbents have been utilized for sulfur removal from both models and real fuel oils, which are metal oxide, molecular sieve, AC, etc. ; of which AC is convenient to acquire the oils with desirable ultralow sulfur content due to their high surface density of functional groups, extensive pore structure, low cost, and large and tunable specific surface area. , The AC surface area is broadly influenced by the carbonaceous material’s precursors and methods of preparation, the adsorption affinity of both refractory and aromatic compounds of sulfur, and the receptivity for modification.…”

Section: Introductionmentioning

confidence: 99%

“…This technique selectively adsorbs sulfur compounds from fuel oils over other constituents onto the surface of an adsorbent by chemical or physical interaction under mild operating conditions. 4,5 Numerous adsorbents have been utilized for sulfur removal from both models and real fuel oils, which are metal oxide, 6 molecular sieve, 7 AC, 8 etc. ; of which AC is convenient to acquire the oils with desirable ultralow sulfur content due to their high surface density of functional groups, extensive pore structure, low cost, and large and tunable specific surface area.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of Activated Carbon Derived from Glycerin Pitch for Desulfurization of Model Fuel Oil and Electrode Application

Zulkefli,

Rahim,

Chua

et al. 2024

Langmuir

View full text Add to dashboard Cite

One of the world's challenging energy issues is introducing practical and affordable technology for organosulfur removal in fuel. Adsorptive desulfurization (ADS) can address this issue if highly effective activated carbon (AC) derived from industrial waste with excellent textural properties is used. In this study, the derived ACs from glycerin pitch loaded with P and Fe (AC/P and AC/Fe) were used as adsorbents for the ADS of model fuel oils, such as dibenzothiophene (DBT) at mild operating conditions. Under the optimized experimental conditions, 0.3 g of adsorbent dosage, 60 min reaction time, 30 °C temperature, and pH 4, the maximal DBT removal of 96.28 and 43.64%, respectively, for AC/P and AC/Fe was realized. The results indicated that the phosphorus-doped AC/P increases the selectivity of the ADS mechanism for DBT removal. Kinetic investigations disclosed that the adsorption process follows second-pseudo-order kinetics and the Langmuir adsorption isotherm model. The adsorbents remained active for five successive reuses, indicating their robust real-world applications. The electrochemical properties of the fabricated carbon electrodes were analyzed via cyclic voltammetry by coating the ACs with polytetrafluoroethylene (PTFE) as a binder. The transition-metal-doped AC/Fe, though exhibiting 5 times lower surface area, showed the highest specific capacitance at a scan rate of 5 mVs–1 (0.65 μF cm–2). Similarly, the extended AC:PTFE capacitor at a 10% binder ratio offered the maximum capacitance value (1.13 μF cm–2). The synthesized ACs demonstrated potential application as an electrode material, and hence glycerin pitch could be a low-cost precursor to improve the feasibility of commercial production of AC.

show abstract

“…Recent environmental regulations stipulate that diesel fuel should contain less S as per the standard [ 5 , 6 ]. Several technologies for deep desulfurization of fuels have been proposed, such as hydrodesulfurization (HDS), selective adsorption, extractive separation, and oxidative desulfurization (ODS) [ [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] ]. Although HDS is a common and effective sulfur removal method in petroleum refineries, its high running costs due to hydrogen consumption, high temperatures, and extended residence time make it an inappropriate method for producing fuel oil with extremely low sulfur content [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous SnO2–MoO3 catalyst for diesel oxidative desulfurization: Impact of the SnO2/MoO3 ratio on catalytic efficiency

Lesafi,

Pogrebnaya,

King'ondu

2023

Heliyon

View full text Add to dashboard Cite

Adsorptive desulfurization using period 4 transition metals oxide: A study of Lewis acid strength derived from the adsorbent ionic-covalent parameter

Cited by 18 publications

References 46 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

Fabrication of Activated Carbon Derived from Glycerin Pitch for Desulfurization of Model Fuel Oil and Electrode Application

Mesoporous SnO2–MoO3 catalyst for diesel oxidative desulfurization: Impact of the SnO2/MoO3 ratio on catalytic efficiency

Contact Info

Product

Resources

About