New bimetallic Mo2C–WC/Al2O3 membrane catalysts in the dry reforming of methane

Kislov, V.R.; Скудин, В. В.; Adamu, Ajiya Dahiru

doi:10.1134/s0023158417010049

Cited by 8 publications

(9 citation statements)

References 9 publications

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“…For the first time, the possibility of the formation of solid solutions in the system was demonstrated in [43]. Then this was confirmed by researchers using different methods for the synthesis of carbides (metallurgical, electrochemical, chemical vapor deposition with further carburization) [17,21,44].…”

Section: Synthesis Of Binary Carbidesmentioning

confidence: 91%

“…Tungsten carbide is characterized by a higher oxophilicity, and when it is incorporated into the structure of molybdenum carbide, the metallic properties of molybdenum carbide change [15]. The presence of a synergistic effect in binary carbide Mo 2 C-W 2 C was confirmed for many catalytic processes including hydrogen evolution reaction (HER), dry reforming of methane, and conversion of aromatic hydrocarbons [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…In the first stage, binary trioxides MoO 3 -WO 3 are synthesized, which are then subjected to temperature-programmed carburization in the second stage. The synthesis of trioxides can be carried out by different methods: mechanical stirring, coprecipitation, hydrothermal synthesis, and freeze-drying [10,19,20]; electrochemical deposition [21]; chemical vapor deposition [17]; precipitation from solutions [22]; thermal decomposition of salts [23]; or the sol-gel method [24]. Gas mixture of methane/hydrogen or propane/hydrogen [25][26][27][28][29] as a carburizing agent are usually used.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Microporous Mo2C-W2C Binary Carbides by Thermal Decomposition of Molybdenum-Tungsten Blues

Гаврилова

Myachina

Dyakonov³

et al. 2020

Nanomaterials

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Molybdenum and tungsten carbides are perspective catalytic systems. Their activity in many reactions is comparable to the activity of platinum group metals. The development of the synthesis method for of highly dispersed binary molybdenum and tungsten carbides is an important task. Dispersions of molybdenum-tungsten blue were used as a precursor for synthesis of binary molybdenum and tungsten carbides. The synthesis of carbides was carried out by thermal decomposition of molybdenum-tungsten blue xerogels in an inert atmosphere. The binary carbides were characterized by XRD, TGA, SEM and nitrogen adsorption. The influence of the molar ratio reducing agent/Me [R]/[ΣMe], molar ratio molybdenum/tungsten [Mo]/[W] on phase composition, and morphology and porous structure of binary carbides was investigated. Samples of binary molybdenum and tungsten carbides with a highly developed porous structure and a specific surface area were synthesized.

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Section: Synthesis Of Binary Carbidesmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Microporous Mo2C-W2C Binary Carbides by Thermal Decomposition of Molybdenum-Tungsten Blues

Гаврилова

Myachina

Dyakonov³

et al. 2020

Nanomaterials

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“…It was observed that an increasing W content led to decreasing activity relative to monometallic Mo carbides, but the selectivity toward the more desired products such as benzene and xylene increased. Wang et al used a bimetallic carbide catalyst consisting of Mo 2 C and WC for the electrochemical hydrogen evolution reaction . Here they found that electrochemical activation can partially remove surface carbon that in turn changed the surface hydrophilicity, leading them to hypothesize that the contribution of the residual carbon protects the carbide from oxidation, maintaining high activity and stability of the catalyst …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Supported Mixed MoW Carbide Catalysts

et al. 2023

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For mixed MoW carbide catalysts, the relationship between synthesis conditions, evolution of (mixed) phases, extent of mixing, and catalytic performance of supported Mo/W carbides remains unclear. In this study, we prepared a series of carbon nanofibersupported mixed Mo/W-carbide catalysts with varying Mo and W compositions using either temperature-programmed reduction (TPR) or carbothermal reduction (CR). Regardless of the synthesis method, all bimetallic catalysts (Mo:W bulk ratios of 1:3, 1:1, and 3:1) were mixed at the nanoscale, although the Mo/W ratio in individual nanoparticles varied from the expected bulk values. Moreover, the crystal structures of the produced phases and nanoparticle sizes differed depending on the synthesis method. When using the TPR method, a cubic carbide (MeC 1−x ) phase with 3−4 nm nanoparticles was obtained, while a hexagonal phase (Me 2 C) with 4−5 nm nanoparticles was found when using the CR method. The TPR-synthesized carbides exhibited higher activity for the hydrodeoxygenation of fatty acids, tentatively attributed to a combination of crystal structure and particle size.

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“…Research efforts on nickel–alumina catalysts have focused on improving the coke and sinter resistance by minimizing the particle size and adding small amounts of noble metals (NMs) . However, due to the high costs associated with noble metals, more recent efforts have turned the focus to earth-abundant systems such as transition metal carbides (TMCs). − …”

Section: Introductionmentioning

confidence: 99%

Impact of Morphological Effects on the Activity and Stability of Tungsten Carbide Catalysts for Dry Methane Reforming

Mounfield

Román‐Leshkov

2019

Energy Fuels

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Fundamental understanding of the effects of phase and exposed facets of transition metal carbide (TMC) catalysts on reactivity is a route to preparing more active and stable materials for targeted applications. In this work, two geometries of tungsten carbide nanomaterials, nanorods, and nanoparticles with different exposed facets were synthesized to investigate the impact of morphological effects on the catalytic performance for the dry methane reforming (DMR) reaction. β-W 2 C nanoparticles maintained high activity and exhibited less coke formation for more than 40,000 turnovers, while α-WC nanorods began to deactivate after only 8000 turnovers. The difference in reactivity is attributed to the promotion of coke formation by the exposed facets of the nanorods, while the diverse facets of the nanoparticles inhibit coke formation and promote the DMR reaction. The synthesis of a variety of TMC morphologies provides an avenue for the future study and design of viable catalysts for a wide range of applications.

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New bimetallic Mo2C–WC/Al2O3 membrane catalysts in the dry reforming of methane

Cited by 8 publications

References 9 publications

Synthesis of Microporous Mo2C-W2C Binary Carbides by Thermal Decomposition of Molybdenum-Tungsten Blues

Synthesis of Microporous Mo2C-W2C Binary Carbides by Thermal Decomposition of Molybdenum-Tungsten Blues

Synthesis and Characterization of Supported Mixed MoW Carbide Catalysts

Impact of Morphological Effects on the Activity and Stability of Tungsten Carbide Catalysts for Dry Methane Reforming

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