Support effects on the chemical property and catalytic activity of Co-Mo HDS catalyst in sulfur recovery

Pour, Ali Nakhaei; Rashidi, Alimorad; Jozani, Kherolah Jafari; Mohajeri, Afshan; Khorami, Payman

doi:10.1016/s1003-9953(09)60032-3

Cited by 32 publications

(12 citation statements)

References 18 publications

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“…Apart from the aforementioned applications, CNTs have also been utilized for the desulfurization of diesel fuel, 666 oil hydrocarbons aerobic oxidation, 557 hydrodesulfurization process 667,668 and so forth.…”

Section: Other Reactionsmentioning

confidence: 99%

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

et al. 2015

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Carbon nanotubes are promising materials for various applications. In recent years, progress in manufacturing and functionalizing carbon nanotubes has been made to achieve the control of bulk and surface properties including the wettability, acid-base properties, adsorption, electric conductivity and capacitance. In order to gain the optimal benefit of carbon nanotubes, comprehensive understanding on manufacturing and functionalizing carbon nanotubes ought to be systematically developed. This review summarizes methodologies of manufacturing carbon nanotubes via arc discharge, laser ablation and chemical vapor deposition and functionalizing carbon nanotubes through surface oxidation and activation, doping of heteroatoms, halogenation, sulfonation, grafting, polymer coating, noncovalent functionalization and nanoparticle attachment. The characterization techniques detecting the bulk nature and surface properties as well as the effects of various functionalization approaches on modifying the surface properties for specific applications in catalysis including heterogeneous catalysis, photocatalysis, photoelectrocatalysis and electrocatalysis are highlighted.

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Section: Other Reactionsmentioning

confidence: 99%

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

et al. 2015

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“…Thus, e.g., carbon materials interact less with the precursor oxidic phases, allowing a more complete formation of the active sulfides when employing conventional active phases. [32][33][34][35][36] Therefore, the synthesis of hybrid metal oxide/carbon materials bearing supported metal oxide nanoparticles highly dispersed on the carbonaceous support remains an interesting route for the preparation of novel catalysts [37][38][39][40] with a superior performance in hydroprocessing, particularly in deep hydrodesulphurisation.…”

Section: Introductionmentioning

confidence: 99%

Novel MoO₂/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

et al. 2013

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Novel MoO(2)/C nano/microcomposites were prepared via a bottom-up approach by hydrothermal carbonization of a solution of glucose as a carbon precursor in the presence of polyoxometalates (POMs: phosphomolybdic acid [H(3)PMo(12)O(40)] and ammonium heptamolybdate tetrahydrate [(NH(4))(6)Mo(7)O(24)]·4H(2)O). The structural characterization by FT-IR, XRPD, SEM and TEM analyses revealed the controlled formation of hierarchical MoO(2)/C composites with different morphologies: strawberry-like, based on carbon microspheres decorated with MoO(2) nanoparticles; MoO(2)/C core-shell composites; and irregular aggregates in combination with ring-like microstructures bearing amorphous Mo species. These composites can be fine-tuned by varying reaction time, glucose/POM ratio and type of POM precursor. Subsequent transformations in the solid state through calcinations of MoO(2)/C core-shell composites in air lead to hollow nanostructured molybdenum trioxide microspheres together with nanorods and plate microcrystals or cauliflower-like composites (MoO(2)/C). In addition, the MoO(2)/C composite undergoes a morphology evolution to urchin-like composites when it is calcined under nitrogen atmosphere (MoO(2)/C-N(2)). The MoO(2)/C strawberry-like and MoO(2)/C-N(2) composites were transformed into Mo carbide and nitride supported on carbon microspheres (Mo(2)C/C, MoN/C, and MoN/C-N(2)). These phases were tested as precursors in thiophene hydrodesulphurization (HDS) at 400 °C, observing the following trend in relation to the thiophene steady-state conversion: MoN/C-N(2)> MoN/C > Mo(2)C/C > MoO(2)/C-N(2) > MoO(2)/C. According to these conversion values, a direct correlation was observed between higher HDS activity and decreasing crystal size as estimated from the Scherrer equation. These results suggest that such composites represent interesting and promising precursors for HDS catalysts, where the activity and stability can be modified either by chemical or structural changes of the composites under different conditions.

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“…However, the reaction temperature was relatively high, and the stability and longevity required improvement. To date, catalysts with cobalt (Co)/molybdenum (Mo) as active components have been widely used in the hydrodesulfurization (HDS) process to remove sulfur from petroleum products, of which cobalt oxide has been mainly used to achieve low-temperature denitrification. , It has been found that copper (Cu)–Co and Fe–Co double transition metal systems not only can enhance the surface synergistic oxygen vacancies but also can significantly reduce the reaction temperature. , Therefore, cobalt oxide was selected as the active component to prepare a Fe–Co transition metal component catalyst.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO₂ with CO over an Iron/BFS Catalyst

et al. 2021

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To realize high-value sulfur recovery and decrease the reaction temperature, a cobalt-doped modified iron-based catalyst was prepared from blast furnace slag (BFS), which is a byproduct of steelmaking. The effects of the carrier and active components on the catalytic reduction performance were studied, and the mechanism of the optimized modification to promote catalytic reduction was explored. When the mass ratio of cobalt tetroxide, ferric oxide, and the carrier in the catalyst was 4:15:81, the temperature required for the reaction was reduced to 400 °C, and the SO2 conversion rate and average sulfur yield were maintained above 90 and 80% within 2 h, respectively. The results of an in situ diffuse reflectance infrared Fourier-transform spectroscopy experiment and density functional theory calculations revealed that the catalytic mechanism followed both the redox route and the cosine intermediate route. The cobalt-doped modification increased the intermediate acidic sites on the catalyst surface and widened the adsorption temperature range of the catalyst, thus positively promoting the catalytic reaction.

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Support effects on the chemical property and catalytic activity of Co-Mo HDS catalyst in sulfur recovery

Cited by 32 publications

References 18 publications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Novel MoO₂/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO₂ with CO over an Iron/BFS Catalyst

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Support effects on the chemical property and catalytic activity of Co-Mo HDS catalyst in sulfur recovery

Cited by 32 publications

References 18 publications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Novel MoO2/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO2 with CO over an Iron/BFS Catalyst

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Product

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Novel MoO₂/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO₂ with CO over an Iron/BFS Catalyst