Influence of Pore Structure of Coal-based Activated Carbon on Separation of Low-concentration Gas

In this study, low rank bituminous coal was used as raw material for the preparation of a series of coal based activated carbons(CACs) with similar surface properties but different pore structures, and these CACs could be used to enrich methane from low concentration gas by pressure swing adsorption...

Full description

Saved in:
Bibliographic Details
Published inMei kuang an quan Vol. 51; no. 12; pp. 23 - 26
Main Author ZHANG Yachao, FU Hanghang, WANG Fujun, WENG Qi, DOU Chengyi
Format Journal Article
LanguageChinese
Published Editorial Office of Safety in Coal Mines 01.12.2020
Subjects
activated carbon
ch4 enrichment
chemical activation
low-concentration gas
pore structure
Online AccessGet full text

Cover

More Information
Summary:In this study, low rank bituminous coal was used as raw material for the preparation of a series of coal based activated carbons(CACs) with similar surface properties but different pore structures, and these CACs could be used to enrich methane from low concentration gas by pressure swing adsorption(PSA) method. The surface morphology of raw material changed from smooth and dense to loose and porous before and after preparation, in addition, the high-pressure adsorption isotherms of methane and nitrogen indicated that the adsorption performance of CACs for methane is stronger than nitrogen. The prediction results by ideal adsorbed solution theory(IAST) method also showed that prepared CACs have a high selectivity for methane and nitrogen mixture at low pressure. But when pressure is higher, the selectivity increases more rapidly with increasing molar fraction of methane in the gas phase. Also, selectivity is mainly affected by micro-pores in the range of 0.55 to 0.85 nm, while meso-pores and macro-pores are n
ISSN:1003-496X
DOI:10.13347/j.cnki.mkaq.2020.12.005