Effect of Surface Chemistry and Textural Properties of Activated Carbons for CH4 Selective Adsorption through Low-Concentration Coal Bed Methane

2016 ◽  
Vol 61 (6) ◽  
pp. 2120-2127 ◽  
Author(s):  
Hongyan Pan ◽  
Yun Yi ◽  
Qian Lin ◽  
Guangyan Xiang ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Selective Adsorption ◽  
Textural Properties ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Low Concentration ◽  
Effect Of Surface

Revisiting the Effect of Surface Chemistry on Adsorption of Water on Activated Carbons

1999 ◽  
Vol 103 (19) ◽  
pp. 3877-3884 ◽  
Author(s):  
Issa I. Salame ◽  
Andrey Bagreev ◽  
Teresa J. Bandosz
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Adsorption Of Water ◽  
Effect Of Surface

scholarly journals Effects of micropore structure of activated carbons on the CH4/N2 adsorption separation and the enrichment of coal-bed methane

Clean Energy ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 329-338
Author(s):  
Jinhua Zhang ◽  
Lanting Li ◽  
Qiang Qin
Keyword(s):  
Pore Structure ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Chemical Properties ◽  
Dynamic Effect ◽  
Decisive Role ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Separation Coefficient ◽  
Separation Performance

Abstract In the process of enriching CH4 from coal-bed methane, the separation of CH4/N2 is very difficult to accomplish by an adsorption process due to the similar physico-chemical properties of the two molecules. A series of coconut-shell-based granular activated carbons (GACs) with different pore structures were prepared, which were characterized by different methods. The influence of the pore structure on the separation properties was investigated in detail. The results show that one of the carbons prepared (GAC-3) has high CH4 equilibrium adsorption capacity (3.28 mol·kg–1) at 298 K and equilibrium separation coefficient (3.95). The CH4/N2 separation on the GACs is controlled by adsorption equilibrium as compared with the dynamic effect. Taking the specific surface area, for example, the common characterization index of the pore structure is not enough to judge the separation performance of the GACs. However, the microstructure of carbon materials plays a decisive role for CH4/N2 separation. According to the pore-structure analysis, the effective pore size for the CH4/N2 separation is from 0.4 to 0.9 nm, with the optimum effect occurring in the range of 0.6–0.7 nm, followed by the range of 0.7~0.9 nm. Also, a four-bed vacuum pressure swing adsorption process was adopted to evaluate the performance of GACs for the separation of CH4 from nitrogen.

A New Safety Enrichment Method for Low Concentration Coal Bed Methane-Proportion Pressure Swing Adsorption

2011 ◽  
Vol 233-235 ◽  
pp. 2276-2280 ◽  
Author(s):  
Yong Ling Li ◽  
Ying Shu Liu ◽  
Xiong Yang
Keyword(s):  
Pressure Swing Adsorption ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Carbon Molecular Sieve ◽  
Enrichment Method ◽  
Adsorption Characteristic ◽  
Low Concentration ◽  
Explosion Limit ◽  
Pressure Swing ◽  
Enrichment Process

Based on pressure swing adsorption, Proportion Pressure Swing Adsorption (PPSA), a new enrichment method with high safety, was suggested to enrich the low concentration coal bed gas. A mixture of active carbon (CA) and carbon molecular sieve (CMS) was employed as adsorbent in the process of PPSA. The methane and oxygen in coal bed gas were adsorbed simultaneously. The experimental study was carried out in order to verify the feasibility of this method. The equilibrium adsorption characteristic of CA and CMS were tested. The results showed that both concentrations of CH4 and O2 in desorption gas could be controlled well and would not exceed the explosion limit in enrichment process by adjusting the mass ratio of CMS5/AC1. Therefore, the new method, PPSA, can guarantee the safety in enrichment of coal bed methane.

Effect of Surface Chemistry on Sorption of Water and Methanol on Activated Carbons

Langmuir ◽  
1996 ◽  
Vol 12 (26) ◽  
pp. 6480-6486 ◽  
Author(s):  
Teresa J. Bandosz ◽  
Jacek Jagiełło ◽  
James A. Schwarz ◽  
Andrzej Krzyzanowski
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Effect Of Surface

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

2018 ◽  
Vol 32 (4) ◽  
pp. 4547-4558 ◽  
Author(s):  
Yong Jiao ◽  
Liyang Wang ◽  
Liqin Zhang ◽  
Wenting An ◽  
Wei Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
High Stability ◽  
Solid Oxide ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Oxide Fuel ◽  
Low Concentration ◽  
Direct Operation
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