Synthesis of cube MgO@AC and catalytic performance of its supported CoMo for hydrodesulfurization of 4,6-dimethyldibenzothiophene

Yu, Zhiqing; Wang, Xiaohan; Liu, Haoran; Huang, Weixing; Deng, Kaixin; Liu, Xiaoyue; Xiao, Zhihua; Wei, Qiang; Zhou, Yasong

doi:10.1016/j.fuel.2023.128072

Cited by 5 publications

(1 citation statement)

References 54 publications

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“…The valence state of Mo changes prominently from Mo 6+ to Mo 5+ and Mo 4+ after sulfidation. The Co 2p spectrum (Figure b) shows peaks at approximately 778.4 and 793.8 eV attributed to Co 2p 3/2 and Co 2p 1/2 of CoMoS phases, respectively. − The peaks at 781.2 and 797.8 eV are ascribed to Co 2+ . The Co 2p spectrum indicates that presulfide-based CoMo/Al 2 O 3 possesses a high percentage of cobalt in CoMoS (43.4%) at the surface .…”

Section: Resultsmentioning

confidence: 99%

Roles of the Comproportionation Reaction in SO₂ Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

Sun,

Huang,

Jia

et al. 2023

Environ. Sci. Technol.

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SO 2 reduction with CH 4 to produce elemental sulfur (S 8 ) or other sulfides is typically challenging due to high energy barriers and catalyst poisoning by SO 2 . Herein, we report that a comproportionation reaction (CR) induced by H 2 S recirculating significantly accelerates the reactions, altering reaction pathways and enabling flexible adjustment of the products from S 8 to sulfides. Results show that SO 2 can be fully reduced to H 2 S at a lower temperature of 650 °C, compared to the 800 °C required for the direct reduction (DR), effectively eliminating catalyst poisoning. The kinetic rate constant is significantly improved, with CR at 650 °C exhibiting about 3-fold higher value than DR at 750 °C. Additionally, the apparent activation energy decreases from 128 to 37 kJ/mol with H 2 S, altering the reaction route. This CR resolves the challenges related to robust sulfur−oxygen bond activation and enhances CH 4 dissociation. During the process, the well-dispersed lamellar MoS 2 crystallites with Co promoters (CoMoS) act as active species. H 2 S facilitates the comproportionation reaction, reducing SO 2 to a nascent sulfur (S x *). Subsequently, CH 4 efficiently activates CoMoS in the absence of SO 2 , forming H 2 S. This shifts the mechanism from Mars−van Krevelen (MvK) in DR to sequential Langmuir−Hinshelwood (L-H) and MvK in CR. Additionally, it mitigates sulfation poisoning through this rapid activation reaction pathway. This unique comproportionation reaction provides a novel strategy for efficient sulfur resource utilization.

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Section: Resultsmentioning

confidence: 99%

Roles of the Comproportionation Reaction in SO₂ Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

Sun,

Huang,

Jia

et al. 2023

Environ. Sci. Technol.

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The superior HDS catalyst derived from a new Waugh Co-Mo polyoxometalate via cationic substitution

Liang,

Wu,

et al. 2024

Fuel

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The organic–inorganic dual anchoring strategy based on organic chelators and lacunary polyoxometalates for the preparation of efficient CoWS hydrodesulfurization catalysts

Bao,

Zhang,

Yan

et al. 2024

Fuel

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Synthesis of cube MgO@AC and catalytic performance of its supported CoMo for hydrodesulfurization of 4,6-dimethyldibenzothiophene

Cited by 5 publications

References 54 publications

Roles of the Comproportionation Reaction in SO₂ Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

Roles of the Comproportionation Reaction in SO₂ Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

The superior HDS catalyst derived from a new Waugh Co-Mo polyoxometalate via cationic substitution

The organic–inorganic dual anchoring strategy based on organic chelators and lacunary polyoxometalates for the preparation of efficient CoWS hydrodesulfurization catalysts

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Synthesis of cube MgO@AC and catalytic performance of its supported CoMo for hydrodesulfurization of 4,6-dimethyldibenzothiophene

Cited by 5 publications

References 54 publications

Roles of the Comproportionation Reaction in SO2 Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

Roles of the Comproportionation Reaction in SO2 Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

The superior HDS catalyst derived from a new Waugh Co-Mo polyoxometalate via cationic substitution

The organic–inorganic dual anchoring strategy based on organic chelators and lacunary polyoxometalates for the preparation of efficient CoWS hydrodesulfurization catalysts

Contact Info

Product

Resources

About

Roles of the Comproportionation Reaction in SO₂ Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

Roles of the Comproportionation Reaction in SO₂ Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides