Effect of carburization protocols on molybdenum carbide synthesis and study on its performance in CO hydrogenation

Tao, Mu‐Xuan; Xu, Jian; Yang, Yong; Li, Yongwang

doi:10.1016/j.cattod.2015.07.014

Cited by 95 publications

(51 citation statements)

References 61 publications

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“…A similar spectrum as the fresh Mo−ZrO 2 was observed (Figure ), indicating that the Mo species was stable under the reaction condition. Although molybdenum carbide (Mo 2 C) can form during syngas conversion, we did not observe the Mo 2 C species in used catalyst which possesses characteristic peak at 228 eV (Mo 3d) ,. Mo and co‐workers reported that under carburization conditions, Mo 2 C can only form at temperatures higher than 600 °C .…”

Section: Resultsmentioning

confidence: 60%

Selective Conversion of Syngas to Aromatics over a Mo−ZrO₂/H‐ZSM‐5 Bifunctional Catalyst

et al. 2019

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Direct conversion of syngas to aromatics is an extremely challenging target due to the complex reaction pathways. Herein, we present a well‐designed bifunctional catalyst composed of Mo‐doped ZrO2 nanoparticles and zeolite H‐ZSM‐5 for one‐step conversion of syngas to aromatics. The Mo−ZrO2 converts syngas to methanol as reaction intermediate, which can be successively converted to aromatics by H‐ZSM‐5. Hydrogenation ability of mixed oxides is pivotal to both selectivity and productivity of aromatics. We intensively clarify the individual role of catalyst components among CO activation, H2 activation and aromatization. With a Mo/Zr molar ratio of 1 : 68, the Mo−ZrO2/H‐ZSM‐5 resulted in 76 % selectivity of aromatics at 22 % CO conversion, and the productivity of aromatics reached 0.17 g gcat−1 h−1 at 400 °C and 4 MPa. Moreover, the distribution of aromatics can be tuned by surface modification of H‐ZSM‐5.

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Section: Resultsmentioning

confidence: 60%

Selective Conversion of Syngas to Aromatics over a Mo−ZrO₂/H‐ZSM‐5 Bifunctional Catalyst

et al. 2019

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“…Recently, Li et al. reported that MoC formation was favored when a higher concentration of hydrocarbon or a long‐chain hydrocarbon was used . Tang et al.…”

Section: Resultsmentioning

confidence: 99%

A Redox‐anchoring Approach to Well‐dispersed MoC_x/C Nanocomposite for Efficient Electrocatalytic Hydrogen Evolution

Zhou

Zhang

Huang

et al. 2017

Chemistry An Asian Journal

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Here we report a redox-anchoring strategy for synthesizing a non-noble metal carbide (MoC ) nanocomposite electrocatalyst for water electrolysis in acidic media, using glucose and ammonium heptamolybdate as carbon and Mo precursors, respectively, without the need of gaseous carbon sources such as CH . Specifically, the aldehyde groups of glucose are capable of reducing Mo to Mo (MoO ), and thus molybdenum species can be well anchored by a redox reaction onto a carbon matrix to prevent the aggregation of MoC nanoparticles during the following carbonization process. The morphology and chemical composition of the electrocatalysts were well characterized by BSE-SEM, TEM, XRD and XPS. The obtained MoC -2 sample showed a reasonably high hydrogen evolution reaction (HER) activity and excellent stability in an acidic electrolyte, and its overpotential required for a current density output of 20 mA cm is as low as 193 mV. Such a prominent performance is ascribed to the excellent dispersity and nano-size, and the large reactive surface area of MoC particles. This work may open a new way to the design and fabrication of other non-noble metal carbide nanocatalysts for various electrochemical applications.

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“…Instead, an oxidation is induced by illuminating a worn position of an MoS x film with high laser power (5.7 mW), see Figure 5b; MoO 3 -related Raman modes at 290 and 810 cm −1 are observed. Additionally, the background at about 800 cm −1 is increased, which is probably due to the presence of further molybdenum-oxygen stretching modes [27].…”

Section: Tribological Propertiesmentioning

confidence: 99%

Investigation of the Tribofilm Formation of HiPIMS Sputtered MoSx Thin Films in Different Environments by Raman Scattering

et al. 2019

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Understanding the generation of third body particles and their contribution to the formation of tribofilms of MoS x thin films is still challenging due to a large number of influencing factors. Besides the structure of the as-deposited MoS x films, the environment and the conditions during the Ball-on-disk tests affect tribofilms and thus the friction. Therefore, the influence of the surface pressure and sliding velocity in air, argon and nitrogen environments on the generation of the third body particles and the tribofilm formation of randomly oriented MoS x films is investigated. A high surface pressure is one major factor to achieve low friction, especially under humid conditions, which is important considering the use in industrial applications, for example dry-running screw machines. However, the mechanisms leading to that frictional behavior are still affected by the surrounding environment. While low friction is caused by a more extensive tribofilm formation in air, in argon and nitrogen, large size third body particles dispensed all over the contact area contribute to a lower friction. Raman scattering reveal a different chemistry of these particles reflected in the absence of laser-or temperature-induced surface oxidation compared to the as-deposited film and the wear track. The Raman scattering results are discussed with respect to the wear particle size, its chemical reactivity and strain-induced bonding changes.

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Effect of carburization protocols on molybdenum carbide synthesis and study on its performance in CO hydrogenation

Cited by 95 publications

References 61 publications

Selective Conversion of Syngas to Aromatics over a Mo−ZrO₂/H‐ZSM‐5 Bifunctional Catalyst

Selective Conversion of Syngas to Aromatics over a Mo−ZrO₂/H‐ZSM‐5 Bifunctional Catalyst

A Redox‐anchoring Approach to Well‐dispersed MoC_x/C Nanocomposite for Efficient Electrocatalytic Hydrogen Evolution

Investigation of the Tribofilm Formation of HiPIMS Sputtered MoSx Thin Films in Different Environments by Raman Scattering

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Effect of carburization protocols on molybdenum carbide synthesis and study on its performance in CO hydrogenation

Cited by 95 publications

References 61 publications

Selective Conversion of Syngas to Aromatics over a Mo−ZrO2/H‐ZSM‐5 Bifunctional Catalyst

Selective Conversion of Syngas to Aromatics over a Mo−ZrO2/H‐ZSM‐5 Bifunctional Catalyst

A Redox‐anchoring Approach to Well‐dispersed MoCx/C Nanocomposite for Efficient Electrocatalytic Hydrogen Evolution

Investigation of the Tribofilm Formation of HiPIMS Sputtered MoSx Thin Films in Different Environments by Raman Scattering

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Product

Resources

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Selective Conversion of Syngas to Aromatics over a Mo−ZrO₂/H‐ZSM‐5 Bifunctional Catalyst

Selective Conversion of Syngas to Aromatics over a Mo−ZrO₂/H‐ZSM‐5 Bifunctional Catalyst

A Redox‐anchoring Approach to Well‐dispersed MoC_x/C Nanocomposite for Efficient Electrocatalytic Hydrogen Evolution