NDLI: The effect of small micropores on methane adsorption of coals from Northern China

Content Provider	Springer Nature Link
Author	An, Feng Hua Cheng, Yuan Ping Wu, Dong Mei Wang, Liang
Copyright Year	2012
Abstract	In this study, the effect of coal micropores on the adsorption properties, especially the Langmuir pressure (P L ), was investigated by testing 11 coal samples from Northern China. The adsorption of CO2 at 273 K was utilized to analyze the pore size distribution. The results of these coals show that micropore volume and micropore surface area are the major factors affecting the Langmuir volume (V L ) but have weaker effects on P L . Micropore filling theory considers that some smaller micropores with an obvious overlapping adsorption force cause volume filling adsorption. These micropores firstly reach saturated adsorption, controlling the adsorption volume at the low-pressure stage and thus have a great effect on P L . Four times the methane molecular diameter, 1.5 nm, was assumed as the critical pore size with obvious overlapping adsorption force. The relationship between P L and the proportion of the pore volume below 1.5 nm to the micropore volume was investigated, and it was found that the higher the volume proportion of these small micropores was, the smaller the P L was, though two data points deviated from this trend. The reason for the anomalous coal samples could be the deviation from the assumed critical pore size of 1.5 nm for volume filling and the effects of the various micropore surface properties, which await further study.The micropore surface increases with increasing coal rank, as does V L . The proportion of pore volume below 1.5 nm increases with coal rank, and P L reverses. However, these relationships are discrete.
Starting Page	83
Ending Page	90
Page Count	8
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	19
Issue Number	1
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2012-10-17
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Langmuir volume Langmuir pressure Micropore filling theory Pore size distribution Coal rank Industrial Chemistry/Chemical Engineering Surfaces and Interfaces, Thin Films Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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