Study on reduction of MoS2 powders with activated carbon to produce Mo2C under vacuum conditions

Zhang, Guohua; Chang, He‐Qiang; Wang, Lu; Chou, Kuo‐Chih

doi:10.1007/s12613-018-1585-8

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…An alternative explanation is the formation of CH 3 SH adsorption structures. Mo carbide formation can be excluded, since our low-temperature, sulfur-rich HDS environment is far away from the conditions for which Mo 2 C or MoS x C y formation were observed 31–33 .…”

Section: Resultsmentioning

confidence: 95%

In situ observations of an active MoS2 model hydrodesulfurization catalyst

et al. 2019

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The hydrodesulfurization process is one of the cornerstones of the chemical industry, removing harmful sulfur from oil to produce clean hydrocarbons. The reaction is catalyzed by the edges of MoS 2 nanoislands and is operated in hydrogen-oil mixtures at 5–160 bar and 260–380 °C. Until now, it has remained unclear how these harsh conditions affect the structure of the catalyst. Using a special-purpose high-pressure scanning tunneling microscope, we provide direct observations of an active MoS 2 model catalyst under reaction conditions. We show that the active edge sites adapt their sulfur, hydrogen, and hydrocarbon coverages depending on the gas environment. By comparing these observations to density functional theory calculations, we propose that the dominant edge structure during the desulfurization of CH 3 SH contains a mixture of adsorbed sulfur and CH 3 SH.

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Section: Resultsmentioning

confidence: 95%

In situ observations of an active MoS2 model hydrodesulfurization catalyst

et al. 2019

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“…Among the transition-metal carbides, molybdenum carbide (Mo 2 C) has received increased attention in recent years. 10) Because of its high hardness, high melting point, and wear resistance, Mo 2 C has been widely applied as a reinforcement material in in steel and in metal ceramics. 11,12) It is worth mentioning that Mo 2 C is also an effective grain growth inhibitor due to its high solubility and mobility in the metal matrix phase.…”

Section: Mechanical Properties and Microstructures Of Mo 2 C Strengthmentioning

confidence: 99%

Mechanical Properties and Microstructures of Mo<sub>2</sub>C Strengthened Vanadis 4 Extra Alloy Steel by Powder Metallurgy and Heat Treatments

Chang

Chuang

Huang³

2019

ISIJ Int.

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In this work, different ratios of molybdenum carbide (1, 3 and 5 mass% Mo 2 C) powders were added to Vanadis 4 extra alloy steel powders and then mixed by ball milling for 6 h. The composite powders underwent vacuum sintering at 1 200, 1 220, 1 240, 1 260 and 1 280°C for 1 h, respectively. The results showed that the optimal sintering temperature for the addition of 5 mass% Mo 2 C powders was 1 220°C. It also represented that the apparent porosity was 0.18%, and that a transverse rupture strength (TRS) value of 2 281.3 MPa and a hardness value of 79.2 HRA were obtained, respectively. Additionally, the TRS value was obviously enhanced to 2 437.6 and 2 491.4 MPa by the addition of 5 mass% Mo 2 C powders after heat treatment and sub-zero plus heat treatments, respectively. Meanwhile, the hardness value also increased to 80.6 and 81.3 HRA, respectively, whereas the Mo-rich M 6 C carbides distributed in the grain boundaries, and V-rich MC carbides appeared in the grain and grain boundaries after sub-zero plus heat treatments. Significantly, a series of heat treatment processes is effective in improving the microstructure and strengthening the mechanical properties of the sintered Vanadis 4 extra composites.

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“…among these carbides, molybdenum carbide (Mo 2 C) has received considerable attention as a refractory hard material because it offers attractive properties such as high hardness, high melting point, and high chemical stability. it has been widely applied as a reinforcement 1 material in metal ceramics [15,16]. Moreover, Mo 2 C is also the most effective grain growth inhibitor due to its excellent solubility and mobility in the metal matrix phase during the liquid phase sintering (LPS) of the PM process [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Microstructure and Strengthening Mechanisms of Mo2C Powders Being Added to Ti-8Nb-4Co Alloy Via the Vacuum Sintering Process

Chang,

Liao,

Huang

et al. 2023

Archives of Metallurgy and Materials

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EffEcts of thEMicrostructurE and strEngthEning MEchanisMs of Mo 2 c PowdErs BEing addEd to ti-8nb-4co alloy Via thE VacuuM sintEring ProcEssThis study utilizes Ti-8nb-4Co alloys added to different proportions of Mo 2 C powders (1, 3, and 5 mass%) by the vacuum sintering process of powder metallurgy and simultaneously vacuum sinters the alloys at 1240, 1270, 1300, and 1330°C for 1 h, respectively. The experimental results indicate that when 3 mass% Mo 2 C powders were added to the Ti-8nb-4Co alloys, the specimens possessed the optimal mechanical properties after sintering at 1300°C for 1 h. The relative density was 98.02%, and the hardness and TRS were enhanced to 69.6 hRa and 1816.7 MPa, respectively. in addition, the microstructure of vacuum sintered Ti-8nb-4Co-3Mo 2 C alloys has both α and β-phase structures, as well as TiC precipitates. EBSD results confirm that the Mo 2 C in situ produced TiC during the sintering process and was uniformly dispersed in the grain boundary. Moreover, the reduced molybdenum atom acted as a β-phase stabilizing element and solid-solution in the titanium matrix.

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Study on reduction of MoS2 powders with activated carbon to produce Mo2C under vacuum conditions

Cited by 15 publications

References 27 publications

In situ observations of an active MoS2 model hydrodesulfurization catalyst

In situ observations of an active MoS2 model hydrodesulfurization catalyst

Mechanical Properties and Microstructures of Mo<sub>2</sub>C Strengthened Vanadis 4 Extra Alloy Steel by Powder Metallurgy and Heat Treatments

Effects of the Microstructure and Strengthening Mechanisms of Mo2C Powders Being Added to Ti-8Nb-4Co Alloy Via the Vacuum Sintering Process

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