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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Related Experiment Video

Updated: Sep 10, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Published on: November 28, 2017

Molybdenum disulfide nanosheets intercalated between graphite layers.

Koya San-Yoshi¹, Takehiko Sasaki², Takeshi Kubota³

¹Chemistry Course, Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, Ueda, Morioka, Iwate 020-8551, Japan. mshirai@iwate-u.ac.jp.

Chemical Communications (Cambridge, England)

|August 26, 2025

Summary

Molybdenum disulfide-graphite intercalation compounds (MoS2-GICs) show enhanced catalytic activity for hydrodesulfurization and hydrogenation reactions. These novel materials outperform traditional supported catalysts in key chemical processes.

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Last Updated: Sep 10, 2025

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Published on: December 20, 2016

Area of Science:

Materials Science
Catalysis
Nanotechnology

Background:

Molybdenum disulfide (MoS2) is a key catalyst for hydrodesulfurization (HDS) and hydrogenation.
Developing advanced MoS2 structures can improve catalytic performance.
Graphite intercalation compounds offer unique structural properties for catalyst design.

Purpose of the Study:

To synthesize and characterize molybdenum disulfide-graphite intercalation compounds (MoS2-GICs).
To evaluate the catalytic activity of MoS2-GICs in hydrodesulfurization (HDS) of dibenzothiophene (DBT).
To assess the performance of MoS2-GICs in naphthalene hydrogenation.

Main Methods:

Synthesis of MoS2-GICs via intercalation of molybdenum chloride into graphite followed by sulfidation.
Characterization of the synthesized materials (details not provided in abstract).
Evaluation of catalytic performance in a batch reaction system.

Main Results:

MoS2-GICs were successfully synthesized with controlled MoS2 layer thickness.
MoS2-GICs exhibited superior activity and selectivity for DBT hydrodesulfurization compared to MoS2/Gmix.
MoS2-GICs showed enhanced activity for naphthalene hydrogenation over MoS2/Gmix.

Conclusions:

MoS2-GICs represent a promising class of catalysts with improved performance.
The unique structure of MoS2-GICs enhances their efficacy in HDS and hydrogenation.
This synthesis approach offers a pathway to advanced catalytic materials.