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The modification of activated carbons and the pore structure effect on enrichment of coal‐bed methane
Author(s) -
Zhao GuoFeng,
Bai Peng,
Zhu HongMei,
Yan RiXiong,
Liu XinMei,
Yan ZiFeng
Publication year - 2008
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.147
Subject(s) - adsorption , methane , chemistry , desorption , oxidizing agent , titration , coal , nitrogen , specific surface area , activated carbon , pressure swing adsorption , chemical engineering , analytical chemistry (journal) , inorganic chemistry , chromatography , organic chemistry , catalysis , engineering
A series of activated carbons (ACs) were modified with HNO 3 , H 2 O 2 , O 2 and N 2 heat treatment in order to alter the pore structure and investigate the influence of the pore structure on enriching coal‐bed methane. The pore structure and surface chemical property of all samples were characterized by physical adsorption of nitrogen at 77 K, infrared spectroscopy methods (FT‐IR), temperature‐programmed desorption (TPD) and Boehm titrations. Results showed that oxidizing treatments with HNO 3 , H 2 O 2 and O 2 affected the pore structure significantly and introduced oxygen surface groups that could be removed under N 2 heat treatment. All the samples were evaluated in the simple pressure swing adsorption (PSA) apparatus and the evaluation results indicated that the concentration of enriched methane increased with the surface area of AC and the most optimum pore size with the best enrichment performance is in the range 0.758–0.776 nm. Copyright © 2008 Curtin University of Technology and John Wiley & Sons, Ltd.