Methane hydrate efficient formation in a 3D-rGO/SDBS composite

Area of Science:

• Materials Science
• Chemical Engineering
• Energy Storage

Background:

• Solidified Natural Gas (SNG) technology relies on efficient methane hydrate generation and storage.
• Optimizing storage space and material composition is crucial for industrial SNG applications.
• Current research explores novel promoters to enhance methane hydrate kinetics.

Purpose of the Study:

• To investigate the impact of sodium dodecylbenzene sulfonate (SDBS), graphene oxide (GO), 3D-reduced graphene oxide (3D-rGO), and 3D-rGO/SDBS on methane hydrate formation.
• To evaluate the efficiency of 3D-rGO/SDBS as a promoter for methane storage capacity and generation rate.
• To elucidate the mechanism behind the kinetic promotion effects of 3D graphene materials on methane hydrate.

Main Methods:

• Synthesis and characterization of 3D-rGO and 3D-rGO/SDBS.
• Experimental investigation of methane hydrate formation in the presence of different additives (SDBS, GO, 3D-rGO, 3D-rGO/SDBS).
• Measurement of methane storage capacity, induction time, and formation rate.

Main Results:

• 3D-rGO/SDBS demonstrated a significant heterogeneous effect and interconnected 3D structure, enabling rapid nucleation.
• The presence of 3D-rGO/SDBS enhanced gas dissolution, dispersion, and gas-liquid mass transfer.
• A maximum methane storage capacity of 188 v/v_w (87% of theoretical) was achieved with 600 ppm 3D-rGO/SDBS, with reduced induction time and accelerated formation rate.

Conclusions:

• 3D-rGO/SDBS acts as an effective promoter for methane hydrate formation, significantly improving kinetic performance.
• The study provides valuable data and theoretical insights into hydrate-promoting mechanisms for SNG technology.
• 3D graphene materials show great potential for developing new promoters in the field of SNG.