The Effects of Methane Storage Capacity Using Upgraded Activated Carbon by KOH

In this study, a feasible experiment on adsorbed natural gas (ANG) was performed using activated carbons (ACs) with high surface areas. Upgraded ACs were prepared using chemical activation with potassium hydroxide, and were then applied as adsorbents for methane (CH4) storage. This study had three p...

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Bibliographic Details
Published in:Applied sciences 2018-09, Vol.8 (9), p.1596
Main Authors: Park, Jung, Lee, Gi, Hwang, Sang, Kim, Ji, Hong, Bum, Kim, Ho, Kim, Seokhwi
Format: Article
Language:English
Subjects:
Activated carbon
adsorbed natural gas
Adsorbents
Adsorption
Carbon dioxide
Compressed gas
Computer simulation
gas delivery
Gases
Heat
heat of adsorption
Heat transfer
Methane
Natural gas
Organic chemistry
Potash
Potassium
potassium hydroxide
Researchers
Storage capacity
Studies
Surface chemistry
Thermal conductivity
Vapor phases
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Summary:In this study, a feasible experiment on adsorbed natural gas (ANG) was performed using activated carbons (ACs) with high surface areas. Upgraded ACs were prepared using chemical activation with potassium hydroxide, and were then applied as adsorbents for methane (CH4) storage. This study had three principal objectives: (i) upgrade ACs with high surface areas; (ii) evaluate the factors regulating CH4 adsorption capacity; and (iii) assess discharge conditions for the delivery of CH4. The results showed that upgraded ACs with surface areas of 3052 m2/g had the highest CH4 storage capacity (0.32 g-CH4/g-ACs at 3.5 MPa), which was over two times higher than the surface area and storage capacity of low-grade ACs (surface area = 1152 m2/g, 0.10 g-CH4/g-ACs). Among the factors such as surface area, packing density, and heat of adsorption in the ANG system, the heat of adsorption played an important role in controlling CH4 adsorption. The released heat also affected the CH4 storage and enhanced available applications. During the discharge of gas from the ANG system, the residual amount of CH4 increased as the temperature decreased. The amount of delivered gas was confirmed using different evacuation flow rates at 0.4 MPa, and the highest efficiency of delivery was 98% at 0.1 L/min. The results of this research strongly suggested that the heat of adsorption should be controlled by both recharging and discharging processes to prevent rapid temperature change in the adsorbent bed.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8091596