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Methane Cracking over Cobalt Molybdenum Carbides.

I Alshibane¹, S Laassiri¹, J L Rico²

¹1WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, Glasgow, G12 8QQ UK.

Catalysis Letters

|April 23, 2019

Summary

This study investigated cobalt-molybdenum carbides and nitrides for methane cracking. Results indicate complex phase compositions and carbon deposition, influencing catalytic activity.

Keywords:

Catalytic decomposition Cobalt molybdenum carbide Cobalt molybdenum nitride Methane cracking

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Area of Science:

Catalysis
Materials Science
Chemical Engineering

Background:

Methane cracking is crucial for hydrogen production and carbon materials.
Cobalt-molybdenum compounds are promising catalysts for hydrocarbon conversions.
Understanding structure-activity relationships is key to optimizing catalyst performance.

Purpose of the Study:

To evaluate the catalytic behavior of cobalt-molybdenum carbides (Co3Mo3C, Co6Mo6C) and nitrides (Co3Mo3N, Co6Mo6N) in methane cracking.
To establish the relationship between the chemical composition of these catalysts and their methane cracking activity.
To characterize the phases present and carbon deposition after the reaction.

Main Methods:

Synthesis and characterization of cobalt-molybdenum carbide and nitride catalysts.
Methane cracking reaction experiments under defined conditions.
Post-reaction analysis of catalyst samples using techniques like X-ray diffraction (XRD) and microscopy.

Main Results:

Catalytic activity varied among the studied cobalt-molybdenum compounds.
Post-reaction samples exhibited complex phase compositions, including Co3Mo3C, alpha-cobalt (α-Co), and beta-molybdenum carbide (β-Mo2C).
Different forms of carbon were deposited on the catalysts during the methane cracking reaction.

Conclusions:

The chemical composition of cobalt-molybdenum carbides and nitrides significantly influences their methane cracking activity.
The presence of specific catalytic phases (Co3Mo3C, α-Co, β-Mo2C) and carbon deposition are critical factors in the reaction outcome.
Further research is needed to elucidate the precise mechanisms of carbon formation and its impact on catalyst deactivation.