Role of 3D Alumina Foam Support on the Formation and Dispersion of Active NiMoS Phase for Hydrodesulfurization Application

Umar, Mustapha; Tanimu, Abdulkadir; Ganiyu, Saheed A.; Dafalla, Hatim; Kozhevnikov, Ivan V.; Alhooshani, Khalid

doi:10.1021/acs.energyfuels.0c01236

Cited by 11 publications

(13 citation statements)

References 41 publications

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“…In recent years, sulfur oxides emitted from the combustion of sulfur-containing fossil fuels have caused serious damage to the environment; therefore, the production of ultraclean fuels is the development objective of petrochemical enterprises. − Hydrodesulfurization (HDS) is commonly used to remove sulfur from fossil fuels, and improving the reactivity of catalysts is the key to this technology . It has been found that bimetallic catalysts containing Mo (or W) as the active metal and Co (or Ni) as the promoter have outstanding HDS activity .…”

Section: Introductionmentioning

confidence: 99%

Surfactant-Confined Synthesis of CoMoS Catalysts Using Polyoxometalate Precursors for Superior Fuel Hydrodesulfurization

et al. 2021

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This article proposes a novel surfactant-confined preparation method that uses polyoxometalates (POMs) as the precursor to synthesize CoMo/Al2O3 catalysts. The proposed technique anchors a decyltrimethylammonium bromide (DTAB)-confined POM precursor on the Al2O3 support under a subcritical condition, which weakens the interaction between the metals and support and promotes the generation of reduced-size MoS2 phases with a high dispersion degree and improved stacking. The as-prepared CoMo/Al2O3 catalysts have a higher concentration of accessible CoMoS active sites than their counterparts synthesized by impregnation and hydrothermal methods, endowing them with superior catalytic activity for the hydrodesulfurization (HDS) of dibenzothiophene (DBT) and fluid catalytic cracking (FCC) diesel.

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Section: Introductionmentioning

confidence: 99%

Surfactant-Confined Synthesis of CoMoS Catalysts Using Polyoxometalate Precursors for Superior Fuel Hydrodesulfurization

et al. 2021

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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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“…The recent strict environmental regulations limiting the level of sulfur in the transportation fuel has prompted the need to develop highly active and stable hydrodesulfurization (HDS) catalysts . Previous studies have shown a tremendous improvement in the catalyst activity through changing the active metals or addition of promoters to the active metal, synthesis route, and changing or modification of active metal supports. − Textural and mechanical properties, high active metal dispersion, and low cost have made γ-Al 2 O 3 the most widely acceptable catalyst support for many industrial catalysts including the HDS catalyst . However, a big drawback of γ-Al 2 O 3 is that it shows strong metal–support interaction with active metals .…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Synergy Effect of Zr and Ce on the Catalytic Efficiency of NiMoS Grafted on SBA-15 for Oil Hydrodesulfurization

et al. 2021

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In this study, the synergy effect of biheteroatoms (ZrO x and CeO y ) and a Ni promoter on the catalytic performance of MoS 2 crystallites grafted on SBA-15 silica for the hydrodesulfurization (HDS) of dibenzothiophene (DBT) in diesel was investigated. The pyridine-Fourier transform infrared (py-FTIR) spectroscopy, ammonia temperature-programmed desorption (NH 3 -TPD), and X-ray photoelectron spectroscopy (XPS) analyses revealed that the surface acidity, number of active sites, and the dispersion of MoS 2 crystallites increased significantly with the incorporation of ZrO x and CeO y on SBA-15 than other supported catalysts evaluated. The ZrO x −CeO y −SBA-15-supported NiMo catalyst could remove 59% of DBT in diesel spiked with 1000 ppm of DBT after 1 h of reaction and up to 96% of DBT after 5 h of reaction. Density functional theory (DFT) simulations further gave interesting insights; a thin-film model of SBA-15 decorated with Zr and Ce indicates that the metal sites induced a strong hydrogen bond network leading to higher surface stability. Furthermore, Ce grafted on SBA-15 enhanced the adsorption of water molecules that increases the Bro̷ nsted acid sites and subsequently improved its catalytic efficiency. DFT simulation of thiophene HDS showed a stepwise rupture of thiophene C−S bonds with the second C−S bond breaking as the plausible rate-determining step.

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Role of 3D Alumina Foam Support on the Formation and Dispersion of Active NiMoS Phase for Hydrodesulfurization Application

Cited by 11 publications

References 41 publications

Surfactant-Confined Synthesis of CoMoS Catalysts Using Polyoxometalate Precursors for Superior Fuel Hydrodesulfurization

Surfactant-Confined Synthesis of CoMoS Catalysts Using Polyoxometalate Precursors for Superior Fuel Hydrodesulfurization

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

Experimental and Theoretical Investigation of the Synergy Effect of Zr and Ce on the Catalytic Efficiency of NiMoS Grafted on SBA-15 for Oil Hydrodesulfurization

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