Modeling of Noncatalytic Hydrogen Reduction of Molybdenum Disulfide in the Presence of Lime, by Complex Multistep Gas–Solid Reactions

Afsahi, M. Mehdi; Abolpour, Bahador; Kumar, R. Vasant; Sohrabi, Morteza

doi:10.1080/08827508.2011.635733

Cited by 9 publications

(13 citation statements)

References 25 publications

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“…3 [28,29] and as can be observed concentration ratio or partial pressure ratio of hydrogen to water vapor in the pellet is between 1 and 10 2 depending upon the conditions selected. Using Fig.…”

Section: Thermodynamic Aspectsmentioning

confidence: 99%

“…Experiments were carried out in a locally fabricated thermogravimetric assembly with the accuracy of l0 g using a Mettler Toledo balance (AB-S/FACT). Schematic diagram of the experimental setup and details description of the apparatus and pellet preparation has been reported in a previous study [29]. In all experiments, the hydrogen gas entered from the bottom of the furnace and was allowed to leave through the top of the apparatus.…”

Section: Apparatusmentioning

confidence: 99%

“…Component concentration vs. dimensionless distance at different temperatures in the pellet at t = 1000 s, for 4 mm cylindrical thickness of the pellet, 100% hydrogen concentration in the bulk, ε = 0.69, and solid mixing ratio, = 3[29].…”

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confidence: 99%

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Reaction kinetics of direct hydrogen reduction of molybdenum disulfide in the presence of lime: A single pellet experimental investigation

Afsahi

Kumar

Sohrabi

et al. 2014

Chemical Engineering and Processing: Process Intensification

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Section: Thermodynamic Aspectsmentioning

confidence: 99%

Section: Apparatusmentioning

confidence: 99%

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Reaction kinetics of direct hydrogen reduction of molybdenum disulfide in the presence of lime: A single pellet experimental investigation

Afsahi

Kumar

Sohrabi

et al. 2014

Chemical Engineering and Processing: Process Intensification

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“…Finally, they obtained the fitted reaction rate parameters using the experimental data in order to improve predictions. Afsahi et al (2011) used the concepts developed by this model for the mathematical modeling of similar hydrogen reduction of a porous pellet made up of a mixture of molybdenum disulfide and lime particles. Since reactions between lime and the atmosphere were under control during pellet making, adjustable parameters were not used in the modeling procedure.…”

Section: Introductionmentioning

confidence: 99%

A virtual model for non-catalytic successive gas-solid reactions

Abolpour

Afsahi

2017

MMMS

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Purpose Many of the industrially important processes follow a complex reaction scheme and more than one reaction takes place simultaneously for these systems. Design and scale up of these processes are important but due to the nature of the system and high numbers of the affected parameters, modeling of the complex reactions becomes correspondingly difficult. The purpose of this paper is to develop a general model, which can simplify modeling of such (or similar) complex reactions. Design/methodology/approach Virtual model is a generalized novel approach for modeling of these complex reactions. In this model, the complex reactions have been imagined as a simple reaction. Now, kinetic and structural parameters of this simple reaction have been obtained by fitting the model relationships with the experimental data. Findings In this work, the ability of the virtual model has been validated using the experimental data pertinent to the reduction of molybdenum disulfide and cuprous sulfide by hydrogen in the presence of lime. Originality/value Virtual model is a generalized novel approach for modeling of these complex reactions. In this model, the complex reactions have been imagined as a simple reaction.

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“…Hydrogen reduction of molybdenum disulphide in the presence of lime is a complex reaction that consists of at least two partial reactions as expressed by equations (1) and (2). The gaseous product from the first reaction (H 2 S) reacts with the solid reactant in the second reaction step (CaO) represented as follows Afsahi et al (2011) presented a mathematical model to predict the behaviour of a reaction represented in equation (3), a combination of reactions (1) and (2), within the pellet. They used the ideas developed by Sohn and Won (1985) for successive partial reactions.…”

Section: Introductionmentioning

confidence: 99%

An improved model of lime-enhanced reduction of molybdenum disulphide pellet by hydrogen

Afsahi

Abolpour

Kumar

2014

Mineral Processing and Extractive Metallurgy

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In this study, a mathematical model was developed to describe the progress of the successive gas-solid reactions occurring in a porous pellet and the model was applied to hydrogen reduction of molybdenum disulphide in the presence of lime. To carry out a realistic modelling for the multistep reactions, effect of the structural changes and non-isothermal conditions during the reaction within the pellet has been taken into account. The effect of structural change was implemented in the modelling through variation of the solid reactant grain sizes and effective diffusion. The results predicted by the model were evaluated and validated by comparing with the experimental data. Structural changes and non-isothermal conditions had no significant effect on the modelling results. Therefore, deviation of the model prediction from the experimental data can be ascribed to the side reaction occurring within the pellet. To compensate the effects of the side reaction, adapted parameters were obtained through the experimental data.

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Modeling of Noncatalytic Hydrogen Reduction of Molybdenum Disulfide in the Presence of Lime, by Complex Multistep Gas–Solid Reactions

Cited by 9 publications

References 25 publications

Reaction kinetics of direct hydrogen reduction of molybdenum disulfide in the presence of lime: A single pellet experimental investigation

Reaction kinetics of direct hydrogen reduction of molybdenum disulfide in the presence of lime: A single pellet experimental investigation

A virtual model for non-catalytic successive gas-solid reactions

An improved model of lime-enhanced reduction of molybdenum disulphide pellet by hydrogen

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