Direct Synthesis of Molycarbide by Molybdenite-Carbon Monoxide Reaction in the Presence of Lime

Rao, P.; Prasad, P. M.

doi:10.2320/matertrans1989.34.1229

Mater. Trans., JIM

1993

DOI: 10.2320/matertrans1989.34.1229

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Direct Synthesis of Molycarbide by Molybdenite-Carbon Monoxide Reaction in the Presence of Lime

P. Rao

P. M. Prasad

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Cited by 7 publications

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Kinetics of the direct synthesis of molycarbide by reduction-carburization of molybdenite in the presence of lime

Prasad

Mankhand

Rao³

et al. 2002

Metall Mater Trans B

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Kinetic studies were conducted on the carbon monoxide reduction of molybdenite in the presence of lime. Contrary to the expectation that the MoS 2 (s) ϩ CaO (s) ϩ CO (g) reaction will result in metal formation, molycarbide was found to form and no Mo was detected in the product. This is explained on the basis of thermochemical considerations, which indicate that the Mo 2 C formation is more feasible by eight orders of magnitude. The effects of quantity of lime in the charge, CO flow rate, temperature (1123 to 1298 K), and time of reduction have been studied. Kinetic analysis reveals that the results on the MoS 2 (s) conversion to Mo 2 C (s) fit into a modified parabolic rate law. Based on the thermochemical calculations and experimental findings, the probable reaction scheme has been identified. Molycarbide appears to form by a three-successive solid-gas reaction path consisting of (1) metal formation by the MoS 2 (s) ϩ CO (g) reaction followed by (2) in-situ carburization of Mo metal by CO (g), and finally (3) the scavenging of the COS (g) by lime, resulting in CaS (s). The latter two reactions drive the overall reaction forward. Further, out of these three consecutive reactions, progress of the overall MoS 2 ϩ CaO ϩ CO reaction seems to be governed by the intrinsic kinetics of the first one. Calcium molybdate, which forms as a transitory phase, plays a significant role by modifying the linear kinetics of the MoS 2 (s) ϩ CO (g) to one of parabolic nature.

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Kinetics of the direct synthesis of molycarbide by reduction-carburization of molybdenite in the presence of lime

Prasad

Mankhand

Rao³

et al. 2002

Metall Mater Trans B

Self Cite

View full text Add to dashboard Cite

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A Sulfur Emission-Free Route for the Synthesis of Mo and Mo2C via Carbothermal Reduction of MoS2

Chang

Zhang

Chou

2021

Metall Mater Trans B

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CaO-Assisted Carbothermal Reduction of MoS2 to Synthesize Molybdenum Powder

Chang

Zhang

Chou

2021

JOM

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Direct Synthesis of Molycarbide by Molybdenite-Carbon Monoxide Reaction in the Presence of Lime

Cited by 7 publications

References 10 publications

Kinetics of the direct synthesis of molycarbide by reduction-carburization of molybdenite in the presence of lime

Kinetics of the direct synthesis of molycarbide by reduction-carburization of molybdenite in the presence of lime

A Sulfur Emission-Free Route for the Synthesis of Mo and Mo2C via Carbothermal Reduction of MoS2

CaO-Assisted Carbothermal Reduction of MoS2 to Synthesize Molybdenum Powder

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