Carbon Dioxide Sorption Capacities of Coal Gasification Residues

Underground coal gasification is currently being considered as an economically and environmentally sustainable option for development and utilization of coal deposits not mineable by conventional methods. This emerging technology in combination with carbon capture and sorptive CO2 storage on the res...

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Bibliographic Details
Published in:Environmental science & technology 2011-02, Vol.45 (4), p.1719-1723
Main Authors: Kempka, Thomas, Fernández-Steeger, Tomás, Li, Dong-Yong, Schulten, Marc, Schlüter, Ralph, Krooss, Bernhard M
Format: Article
Language:English
Subjects:
Air
Air Pollution - prevention & control
Applied sciences
Carbon
Carbon Dioxide
Carbon sequestration
Climatology. Bioclimatology. Climate change
Coal - classification
Coal gasification
Coke
Earth, ocean, space
Energy and the Environment
Environmental Monitoring
Exact sciences and technology
External geophysics
Gases
Meteorology
Mining
Other industrial wastes. Sewage sludge
Pollution
Sorption
Temperature
Wastes
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Summary:Underground coal gasification is currently being considered as an economically and environmentally sustainable option for development and utilization of coal deposits not mineable by conventional methods. This emerging technology in combination with carbon capture and sorptive CO2 storage on the residual coke as well as free-gas CO2 storage in the cavities generated in the coal seams after gasification could provide a relevant contribution to the development of Clean Coal Technologies. Three hard coals of different rank from German mining districts were gasified in a laboratory-scale reactor (200 g of coal at 800 °C subjected to 10 L/min air for 200 min). High-pressure CO2 excess sorption isotherms determined before and after gasification revealed an increase of sorption capacity by up to 42%. Thus, physical sorption represents a feasible option for CO2 storage in underground gasification cavities.
ISSN:0013-936X
1520-5851
DOI:10.1021/es102839x