Evolution of structural and thermal properties of carbon-coated TaC nanopowder synthesized by single step reduction of Ta-ethoxide

Brar, Loveleen K.; Singla, Gourav; Pandey, O.P.

doi:10.1039/c4ra12105h

Cited by 29 publications

(15 citation statements)

References 40 publications

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“…The N 2 adsorption-desorption isotherm becomes a type II isotherm and the hysteresis loop disappears in the middle relative pressure. [30] It can be seen from the pore size distribution map inserted in the figure that the micropore Table S1, it can be found that the specific surface area, the micropore volume and the total pore volume of the Fe/AC desulfurizer are reduced, and the average pore diameter is increased. It may be due to the formation of elemental S, iron sulfide and sulfate in the pores of the desulfurizer after desulfurization of Fe/AC, causing clogging of the desulfurizer channel.…”

Section: N 2 Adsorption-desorption Analysis Of Fe/ac Desulfurizersmentioning

confidence: 96%

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

et al. 2020

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Fe/activated carbon desulfurizer is prepared by precipitation method using activated carbon as carrier to remove H2S. The desulfurizer before and after desulfurization was characterized by XRD, XPS, SEM and N2 adsorption–desorption. The results show that the active component of desulfurizer is Fe2O3, which reacts with H2S to form FeS, elemental sulfur and Fe2(SO4)3. The sulfide block the pores, causing the specific surface area, pore volume and fractal dimension to decrease after desulfurization. The effects of gas flow rate, particle size and temperature on the removal of H2S were investigated by solid‐bed reactor. Based on the above experimental data, an improved unreacted shrinking core model is used to study the kinetics of Fe/activated carbon desulfurization at low temperature. The improved unreacted shrinking core model is used to analyzing experimental data, in which the activation energies of surface reaction and internal diffusion were determined to be 0.8801 and 3.301 kJ/mol, respectively.

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Section: N 2 Adsorption-desorption Analysis Of Fe/ac Desulfurizersmentioning

confidence: 96%

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

et al. 2020

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“…Tantalum carbide (TaC) has attractive physical and chemical properties such as a high melting point, high modulus, and hardness values, good ductile behavior at high temperature, high chemical stability, and excellent resistance to oxidation. These properties make TaC a promising material for many applications such as metallic materials reinforcement, electronic devices, rocket nozzle and scramjet component, catalyst support material for ammonia decomposition and acidic‐polymer‐electrolyte membrane for water electrolyzers . A TaC coating on metallic materials can endow the substrate with remarkable properties while preserving its nature.…”

Section: Introductionmentioning

confidence: 99%

“…These properties make TaC a promising material for many applications such as metallic materials reinforcement, electronic devices, rocket nozzle and scramjet component, catalyst support material for ammonia decomposition and acidicpolymer-electrolyte membrane for water electrolyzers. [1][2][3][4][5] A TaC coating on metallic materials can endow the substrate with remarkable properties while preserving its nature. Especially, a layer of tantalum carbide can provide other materials an opportunity to be used as high temperature structural materials.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical deposition of tantalum carbide coatings in molten LiCl‐KCl‐K₂CO₃

Song

Meng

et al. 2018

J Am Ceram Soc

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A method for the preparation of tantalum carbide (TaC) coatings on tantalum by electrochemical reduction in carbonate ions in molten LiCl‐KCl was developed. Carbide coatings were obtained on the tantalum substrate at 900°C with a bias voltage of −1.8 V versus the graphite counter electrode. The phase composition, morphology and strength of the carbide coating were characterized by XRD, SEM, and XPS analyses, as well as scratch testing. Kinetic mechanism for the formation of TaC coatings and evolution of chemical bonds between the carbide layer and substrate were schematically discussed. The coatings consist of a single phase of TaC with a thickness of approximately 5 μm. Ta2O5 and tantalate derivatives in molten salt restrict TaC formation. Electro‐deoxidation of Ta substrate can favorably eliminate tantalum‐involved compounds to produce TaC. TaC coatings improve the surface strength of Ta substrate obviously. The formation of a metal‐carbon solid solution in molten salt determines the existence of excess carbon on Ta substrate. Chemical bonds on the TaC coating were investigated in comparison with those at the interface of the metal‐oxygen‐carbon and carbon film.

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“…In our previous reports, we have successfully synthesized various transition‐metal carbides (TMCs) viz. Mo 2 C, NbC, WC, VC, TaC, and Cr 3 C 7 in a specially designed autoclave at low temperatures. Magnesium (Mg) as a reducing agent plays a vital role during the synthesis of TMCs.…”

Section: Introductionmentioning

confidence: 99%

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

2018

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Nanocrystalline molybdenum disilicide (MoSi2) is synthesized in a specially designed autoclave at 900°C. The XRD results revealed that the formation of MoSi2 is favorable with the blend of MoO3, Si, and Mg powders. The HR‐TEM and SAED patterns confirm the formation of MoSi2 phase. The structural parameters (crystallite size, strain, stress, and deformation energy density) are calculated using the Williamson‐Hall (W‐H) analysis. The formation mechanism involved in the synthesis of MoSi2 is proposed. The nonisothermal oxidation kinetics (~1200°C) of MoSi2 phase is examined through the thermal analysis techniques. The activation energy is determined by the Kissinger‐Akahira‐Sunsose isoconversional kinetic model. Finally, the reaction mechanism involved during the oxidation of MoSi2 phase is identified using the integral master‐plots method.

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Evolution of structural and thermal properties of carbon-coated TaC nanopowder synthesized by single step reduction of Ta-ethoxide

Abstract: Carbon-coated nano-TaC has been synthesized at 800 °C using tantalum-ethoxide by single step chemical reaction route and no external carbon source

Cited by 29 publications

References 40 publications

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

Electrochemical deposition of tantalum carbide coatings in molten LiCl‐KCl‐K₂CO₃

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

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Evolution of structural and thermal properties of carbon-coated TaC nanopowder synthesized by single step reduction of Ta-ethoxide

Abstract: Carbon-coated nano-TaC has been synthesized at 800 °C using tantalum-ethoxide by single step chemical reaction route and no external carbon source

Cited by 29 publications

References 40 publications

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H2S at Low Temperature

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H2S at Low Temperature

Electrochemical deposition of tantalum carbide coatings in molten LiCl‐KCl‐K2CO3

In situ single‐step reduction and silicidation of MoO3 to form MoSi2

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Product

Resources

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Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

Electrochemical deposition of tantalum carbide coatings in molten LiCl‐KCl‐K₂CO₃

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂