Synthesis, application and kinetic modeling of CeO<sub>x</sub>–Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene

Tanimu, Abdulkadir; Ganiyu, Saheed A.; Adamu, Sagir; Alhooshani, Khalid

doi:10.1039/c8re00330k

Cited by 14 publications

(27 citation statements)

References 46 publications

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“…In order to explore the adsorption kinetics of DBT with Si-MCM-41/SA porous hybrid membranes, the pseudo-second-order kinetic model [30,31] was used to fit and analyze the adsorption kinetic data. The pseudo-second order kinetic equation is as follows [32]:…”

Section: Figure 9 Effect Of Adsorption Time On Adsorption Capacitymentioning

confidence: 99%

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Lin¹,

Sun²,

Chen³

et al. 2022

Rev. Chim.

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In this paper, the novel Si-MCM-41/SA porous hybrid membrane was prepared by in-corporating inorganic mesoporous material Si-MCM-41 into sodium alginate (SA) matrix, then cross-linking with 5% glutaraldehyde and 1.0 mol/L hydrochloric acid. Using scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and atomic force microscope (AFM), the prepared Si-MCM-41 sample and Si-MCM-41/SA porous hybrid membrane were characterized. The adsorption kinetics of the dibenzothiophene (DBT) by the Si-MCM-41/SA porous hybrid membrane was explored. Meanwhile, the effects of Si-MCM-41 content, porogen addition amount, DBT concentration, solution temperature, toluene concentration and other factors on the adsorption property of the Si-MCM-41/SA porous hybrid membrane were studied. In addition, the selectivity and reusability of the Si-MCM-41/SA porous hybrid membrane were also explored. The results show that the Si-MCM-41/SA porous hybrid membrane has excellent adsorption capacity for DBT, reaching 350.74 mg/g, which is a great improvement over the pure SA membrane. Moreover, among three sulfides of thiophene, 3-methylthiophene and DBT, the Si-MCM-41/SA porous hybrid membrane has the highest adsorption selectivity for DBT. The Si-MCM-41/SA porous hybrid membrane can be reused at least 5 times. Therefore, it can be known that the Si-MCM-41/SA porous hybrid membrane is an ideal adsorption material with practical application prospects.

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Section: Figure 9 Effect Of Adsorption Time On Adsorption Capacitymentioning

confidence: 99%

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Lin¹,

Sun²,

Chen³

et al. 2022

Rev. Chim.

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“…[88] Mostly, the choice of active metals is based on the level of hydrotreating operation with Ni(Co)Mo(W) being used as a conventional and most popular active metals over six decades in a carrier-free or supported matrix due to low cost and availability. [89][90][91][92][93][94] Moreover, the conventional active has may be employed as sulfided monometallic composed of Mo or W, bimetallic (NiMo, CoMo, NiW, CoW), trimetallic (NiCoMo, NiMoW, CoMoW, NiCoW) and ternary or multicomponent active metals. [95][96][97][98][99][100][101] In addition, various landmarks of noble and other transition metals have been reported.…”

Section: Active Phasementioning

confidence: 99%

“…HDS active metals are usually referred to the active phase after sulfidation in a stream of sulfur containing precursor, with a few exception to metal‐free carbon catalysts [88] . Mostly, the choice of active metals is based on the level of hydrotreating operation with Ni(Co)Mo(W) being used as a conventional and most popular active metals over six decades in a carrier‐free or supported matrix due to low cost and availability [89–94] . Moreover, the conventional active has may be employed as sulfided monometallic composed of Mo or W, bimetallic (NiMo, CoMo, NiW, CoW), trimetallic (NiCoMo, NiMoW, CoMoW, NiCoW) and ternary or multicomponent active metals [95–101] .…”

Section: Active Phasementioning

confidence: 99%

Hierarchical Hybrid Supports and Synthesis Strategies for Hydrodesulfurization of Recalcitrance Organosulfur Compounds

Ganiyu

2021

Chemistry An Asian Journal

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It is undisputed that there is a paradigm shift in the global trend of crude oil towards being more sour and heavier than usual light sources. Consequently, the hydrotreating activity becomes a bottleneck with high content of S, N, metals and other impurities than expected. On the other hand, the price of petroleum products lately witnessed instability and fell to the lowest average price (<USD 20) in recent times. In the same vein, the regulation to control the emission of toxic compounds in the atmosphere become stricter as promulgated by various policymakers. In this sense, robust hydrotreating catalysts with characteristics efficient catalytic activity, selectivity and stability are highly desirable. Recently, different approaches have been used to improve and cushion the unprecedented effect emanated from economic, social and environmental challenges posed by heavy and sour crude sources, price instability of the refined products and regulation to lower the sulfur to minimum level or zero parts per millions (ppm). Importantly, the role of support in catalysis cannot be over emphasized, whilst the surface area and porosity, mechanical and thermal stability, dispersion of active metals, acidity/basicity have been greatly improved, the increased activity, stability and selectivity has been observed significantly. In this review, hybrid supports based on aluminosilicates (zeolitic types) and other notable supports from recent literatures were explored and discussed for Ni(Co)Mo(W) supported catalysts for hydrodesulfurization (HDS) activity of heavy organosulfur molecules. The emphasis on the hybrid supports’ varied characteristics for HDS of organosulfur molecules, where there are necessities for fast diffusion of reactants and products, better dispersion of MoS2 crystallites, high surface area and pore volume, and increased acidity of the catalysts are greatly emphasized. Furthermore, the progress made so far on different HDS active phases viz. noble metals, metal phosphides, intermetallic silicides, carbides and iron‐zinc are highlighted in this write‐up, irrespective of the support composition in the supported catalysts formulations. The need for application of predictive tools, like machine learning (ML) in the design and development of HDS catalysts, and performance evaluation of HDS activity towards achieving better catalytic operation was briefly highlighted. Finally, the review will serve as a summary of scientific efforts in this regards and bridge a gap for the newcomers to investigate the topic in a better way through proper selection and efficient catalysts design.

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“…Therefore, it is important to increase the interaction between the metal and supports by means of modification. It has been reported that the doping of titanium, cerium, and other heteroatoms into the mesoporous molecular sieve has enhanced the performance of the support. − When using 2.5-wt %-ceria-modified SBA-15 support, the metal–support interaction, the dispersion of the active phase, and the acidity of the catalyst are all in the optimal range. Compared with the activity of the unmodified catalyst at the normal reaction temperature (350 °C), even at a lower reaction temperature (325 °C), the HDS performance of the Ce-modified catalyst can almost reach twice that of the former.…”

Section: Developments Of Ultradeep Hydrodesulfurization Catalystsmentioning

confidence: 99%

Ultradeep Hydrodesulfurization of Diesel: Mechanisms, Catalyst Design Strategies, and Challenges

Weng

Cao

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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With the increasingly strict diesel standards in the countries of the world, deep processing of diesel oil to ultralow sulfur levels is receiving more and more attention. This paper mainly reviews the reaction mechanism, catalysts, and process conditions of diesel hydrodesulfurization, and it provides new research directions for producing ultralow sulfur diesel (ULSD). In terms of mechanism, the sterically hindered sulfides, nitrides, aromatic compounds, and hydrogen sulfide affect the direct desulfurization and hydrogenate pathways of the hydrodesulfurization reaction to varying degrees. In order to eliminate these effects, the properties of high-dispersion active metals, large pore size, high specific surface area, high content of medium-weak acid, and a certain amount of Bronsted acid support are beneficial to further improve the activity of the catalyst, to produce ULSD that meets market demand. This article also reviews the influences of process conditions (for instance, temperature, hydrogen pressure, liquid hourly space velocity, and hydrogen consumption) on the diesel ultradeep hydrodesulfurization reaction, and it finds those moderately high temperatures and high hydrogen partial pressures, as well as low space velocity, to be beneficial. In short, the development of new catalysts is the current research hotspot in the field of ultradeep hydrodesulfurization of diesel, and further research is still needed.

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Synthesis, application and kinetic modeling of CeO_x–Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene

Abstract: CeOx–Si–CoMo catalysts for efficient hydrodesulfurization (HDS) activity of dibenzothiophene: role of ceria in catalyst activity and product selectivity.

Cited by 14 publications

References 46 publications

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Hierarchical Hybrid Supports and Synthesis Strategies for Hydrodesulfurization of Recalcitrance Organosulfur Compounds

Ultradeep Hydrodesulfurization of Diesel: Mechanisms, Catalyst Design Strategies, and Challenges

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Synthesis, application and kinetic modeling of CeOx–Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene

Abstract: CeOx–Si–CoMo catalysts for efficient hydrodesulfurization (HDS) activity of dibenzothiophene: role of ceria in catalyst activity and product selectivity.

Cited by 14 publications

References 46 publications

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

Hierarchical Hybrid Supports and Synthesis Strategies for Hydrodesulfurization of Recalcitrance Organosulfur Compounds

Ultradeep Hydrodesulfurization of Diesel: Mechanisms, Catalyst Design Strategies, and Challenges

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Synthesis, application and kinetic modeling of CeO_x–Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene