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CO2 Adsorption Capacities of Gasified Coal Chars Open Access


Other title
gasified coal char
volumetric apparatus
CO2 adsorption
Underground coal Gasification-Carbon Capture and Storage
pyrolysed coal char
Type of item
Degree grantor
University of Alberta
Author or creator
Sripada, Pavan Pramod
Supervisor and department
Gupta, Rajender (Chemical and Materials Engineering)
Trivedi, Japan (Petroleum Engineering)
Examining committee member and department
Gupta, Rajender (Chemical and Materials Engineering)
Arvind Rajendran (Chemical and Materials Engineering)
Trivedi, Japan (Petroleum Engineering)
Department of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
Master of Science
Degree level
Recent interest in the use of post-underground coal gasification (UCG) sites for carbon capture and storage (CCS) has created a need to fundamentally understand the carbon dioxide (CO2) adsorption on gasified and pyrolysed coal chars. More specifically, in this work, the effect of coal properties on the surface area development and subsequently the CO2 adsorption capacities of coal chars are studied. In addition, some design considerations necessary for obtaining reliable adsorption measurements on a volumetric adsorption apparatus have been suggested based on sensitivity analysis on the accuracies on the components of the apparatus. CO2 adsorption isotherms at 45.5oC were obtained for pyrolysed and gasified coal samples. Two pyrolysed chars and four CO2 gasified chars were obtained from different coals at different temperatures. The sorption capacities were in turn compared with the respective raw coal samples. Results indicate that the adsorption capacity of both pyrolysed and gasified char is much higher in comparison to the raw coal samples. In addition, in the case of gasified chars, it was demonstrated that the chars from a sub-bituminous coal (characteristic of very high vitrinite content) had the highest sorption capacity followed by the lignite and bituminous char respectively. Moreover, the pore size distributions indicate enhanced micro and meso-porosity for the chars. The diffusivity decreased with increase in pressure for all the samples. The effective diffusivities in the raw coals were clearly a function of the mesoporosity in the coal. Further, the Dubinin-Astakhov model was found to be consistent with the experimental data.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Ramasamy S, Sripada PP, Khan MM, Tian S, Trivedi J, Gupta R. “Adsorption behavior of CO2 in coal and coal char” Energy and Fuels. 2014; 28(8):5241.Sripada, P. P., Khan, M. M., Ramasamy, S., Kanneganti, V., Trivedi, J., & Gupta, R. (2014). Comparison of CO2 Storage Potential in Pyrolysed Coal Char of different Coal Ranks.Gas Injection for Disposal and Enhanced Recovery, 293.

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