In situ single‐step reduction and silicidation of MoO<sub>3</sub> to form MoSi<sub>2</sub>

Sharma, Piyush; Kaur, Taranpreet; Pandey, O. P.

doi:10.1111/jace.15994

Cited by 22 publications

(6 citation statements)

References 53 publications

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“…Figure shows the HP-DSC profiles of shale oil during oxidation at 5, 10, and 15 °C/min. As known from the HP-DSC and DSC profiles, − two major reaction regions occurred in the temperature range of 30–600 °C, termed as LTO and HTO. The HP-DSC characteristic parameters of each region are listed in Table .…”

Section: Results and Discussionmentioning

confidence: 99%

Oxidation Characteristics and Kinetics of Shale Oil Using High-Pressure Differential Scanning Calorimetry

Zhao

et al. 2021

Energy Fuels

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In situ combustion (ISC) has received much attention in the area of the development of shale oil reservoirs in recent years. The primary mechanism of interest for ISC is the oxidation kinetics of the shale oil with injected oxygen. In this paper, the oxidation characteristics of one shale oil collected from the Xinjiang oilfield were researched using high-pressure differential scanning calorimetry (HP-DSC). Then, the influences of quartz sand and shale detritus on the heat liberated of shale oil were analyzed. Subsequently, the kinetic parameters were determined using two iso-conversional models, Friedman and Ozawa–Flynn–Wall (OFW). The differential scanning calorimetry (DSC) profiles peaked at 317 and 454 °C with heat flows of 4.38 and 7.16 mW/mg, respectively, while the HP-DSC profiles peaked at 301 and 431 °C with heat flows of 32.6 and 7.92 mW/mg, respectively. This finding showed that the heat release yielded by shale oil oxidation was enhanced at 5 MPa compared to 0.1 MPa, especially in the low-temperature oxidation (LTO) region. The shale oil was subjected to a fairly higher heat release yielded by LTO rather than high-temperature oxidation (HTO) at 5 MPa, contrary to the DSC results measured at 0.1 MPa. The shale detritus could accelerate the oxidation reactions of shale oil. At the HTO interval, the activation energy was reduced apparently after the addition of shale detritus, suggesting that shale detritus generated a strong catalytic effect on reducing combustion difficulty. Therefore, it is believed that spontaneous ignition may be achieved during shale oil oxidation.

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Section: Results and Discussionmentioning

confidence: 99%

Oxidation Characteristics and Kinetics of Shale Oil Using High-Pressure Differential Scanning Calorimetry

Zhao

et al. 2021

Energy Fuels

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“…and change in Gibb's free energy(𝐺) are determined through following mathematical relations [38][39][40]]…”

Section: Pre-exponential Factor and Thermodynamic Parametersmentioning

confidence: 99%

Impact of natural antioxidant (silybin) on the thermal stability of Ultra High Molecular Weight Polyethylene: A Thermogravimetric Study

Khattar,

Jagriti,

Kainth

et al. 2024

Preprint

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The natural antioxidant (Silybin), with different concentrations, is introduced in Ultra High Molecular Weight Polyethylene (UHMWPE) and impact on thermal stability is observed. For this, thermograms are recorded at 5 oC/min heating rate in temperature region 50–600 oC through Thermogravimetric Analysis (TGA) technique. The model fitting (Coats and Redfern) kinetic approach is adopted to determine activation energy of each recorded thermograms to identify optimum silybin concentration. UHMWPE, with optimum silybin concentration, are further subjected to three other heating rates (10, 15 and 20 oC) in the same temperature region. By employing deconvolution (bi-Gaussian asymmetric function) approach, two iso-conversional kinetic models (Starink (SR) and Friedman (FR)) are utilized to obtain activation energies of the deconvoluted peaks. Further, the reaction mechanism involved in thermal decomposition, changes in entropy\(\left(S\right)\), change in enthalpy \(\left(H\right)\) and change in Gibbs free energy \(\left(G\right)\) are determined.

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“…It can be seen from Figure 7A,B that the acquired MoSi 2 grains have a spherical or elliptical morphology with the average crystallite A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Section: Morphologies and Grain Size Analysismentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] In addition, MoSi 2 is mainly used as the electrical heating element of industrial furnace and hightemperature structural material. 1,2 In the past few decades, many methods have been proposed for the preparation of MoSi 2 powder, such as conventional arc melting, self-propagating hightemperature synthesis, [9][10][11] mechanical alloying, 12,13 reduction method, 14,15 and plasma spraying. 16,17 However, most of the above processes select MoO 3 or Mo as the molybdenum source.…”

Section: Introductionmentioning

confidence: 99%

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

2021

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The extraction of metal from sulfide mineral is usually accompanied by the emission of sulfur-containing gas (e.g., SO 2 ), which will cause serious pollution to the environment. In this work, a sulfur-emission free route for preparing ultrafine molybdenum disilicide (MoSi 2 ) powder by silicothermic reduction of MoS 2 with the desulfurization agent of lime was proposed. The internal MoS 2 -Si mixture is wrapped in an external desulfurization layer composed of lime. After the reaction is completed, the prepared MoSi 2 can be easily separated from the desulfurization layer by using a non-chemical method. In addition, when the reaction temperature is higher than 1000°C, almost all S in MoS 2 is transformed to sulfurcontaining gas SiS, which can be fully captured by lime to generate CaS, Si, and CaSiO 3 . For the raw material with a MoS 2 :Si molar ratio of 1:4, after reacting at 1000, 1100, and 1200°C for 2 h, the average grain sizes of the obtained MoSi 2 powder are approximately 100, 300, and 800 nm, respectively. Moreover, when the reaction time is prolonged from 2 to 6 h at 1000°C, the average grain size of the acquired MoSi 2 powder is about 200 nm, and the residual sulfur content is about 0.12%. This work provides a new insight to extract metals or metal compounds from sulfide ores without releasing sulfur-containing gas.

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

Cited by 22 publications

References 53 publications

Oxidation Characteristics and Kinetics of Shale Oil Using High-Pressure Differential Scanning Calorimetry

Oxidation Characteristics and Kinetics of Shale Oil Using High-Pressure Differential Scanning Calorimetry

Impact of natural antioxidant (silybin) on the thermal stability of Ultra High Molecular Weight Polyethylene: A Thermogravimetric Study

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

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

Cited by 22 publications

References 53 publications

Oxidation Characteristics and Kinetics of Shale Oil Using High-Pressure Differential Scanning Calorimetry

Oxidation Characteristics and Kinetics of Shale Oil Using High-Pressure Differential Scanning Calorimetry

Impact of natural antioxidant (silybin) on the thermal stability of Ultra High Molecular Weight Polyethylene: A Thermogravimetric Study

A novel sulfur‐emission free route for preparing ultrafine MoSi2 powder by silicothermic reduction of MoS2

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

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂