Effect of thermal and acid treatments on properties of Argentinean low rank coals
The chemical, structural, and textural-morphological features of low rank coals, subbituminous and high volatile bituminous, from Argentinean minefields were examined. Features modifications arising from thermal treatment and mineral matter removal were analyzed and related to chars reactivity for C...
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todo:paper_00908312_v23_n4_p383_Ochoa2023-10-03T14:54:51Z Effect of thermal and acid treatments on properties of Argentinean low rank coals Ochoa, J. Bonelli, P.R. Cassanello, M.C. Cukierman, A.L. Coal char demineralization Coal char gasification Coal char properties Fractals Gas adsorption Gasification Heat treatment Pore size Porosimeters Scanning electron microscopy Volatile organic compounds X ray diffraction analysis Coal char demineralization Coal The chemical, structural, and textural-morphological features of low rank coals, subbituminous and high volatile bituminous, from Argentinean minefields were examined. Features modifications arising from thermal treatment and mineral matter removal were analyzed and related to chars reactivity for CO2 gasification. For this purpose, proximate, ultimate, and ash analyses, X-ray diffraction, mercury intrusion porosimetry, adsorption of CO2 (298 K), and scanning electronic microscopy were performed on the original coals as well as on the raw and demineralized char samples. Thermal treatment increased the coals structural ordering and affected pores of any size, leading to bimodal macro-mesopore size distributions and to a pronounced development of micropores. Disarrangement of the structures took place as a result of mineral matter removal altering mainly macroand mesopores, thus producing unimodal distributions. Structural changes occasioned by thermal treatment and demineralization were also reflected in modifications of the surface fractal dimensions estimated from mercury porosimetry data. Reactivity of chars for gasification was significantly affected by demineralization not only due to removal of metals, likely responsible for catalytic effects, but also induced by the structural modifications. Copyright © 2001 Taylor & Francis. Fil:Ochoa, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bonelli, P.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cassanello, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cukierman, A.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00908312_v23_n4_p383_Ochoa |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Coal char demineralization Coal char gasification Coal char properties Fractals Gas adsorption Gasification Heat treatment Pore size Porosimeters Scanning electron microscopy Volatile organic compounds X ray diffraction analysis Coal char demineralization Coal |
| spellingShingle |
Coal char demineralization Coal char gasification Coal char properties Fractals Gas adsorption Gasification Heat treatment Pore size Porosimeters Scanning electron microscopy Volatile organic compounds X ray diffraction analysis Coal char demineralization Coal Ochoa, J. Bonelli, P.R. Cassanello, M.C. Cukierman, A.L. Effect of thermal and acid treatments on properties of Argentinean low rank coals |
| topic_facet |
Coal char demineralization Coal char gasification Coal char properties Fractals Gas adsorption Gasification Heat treatment Pore size Porosimeters Scanning electron microscopy Volatile organic compounds X ray diffraction analysis Coal char demineralization Coal |
| description |
The chemical, structural, and textural-morphological features of low rank coals, subbituminous and high volatile bituminous, from Argentinean minefields were examined. Features modifications arising from thermal treatment and mineral matter removal were analyzed and related to chars reactivity for CO2 gasification. For this purpose, proximate, ultimate, and ash analyses, X-ray diffraction, mercury intrusion porosimetry, adsorption of CO2 (298 K), and scanning electronic microscopy were performed on the original coals as well as on the raw and demineralized char samples. Thermal treatment increased the coals structural ordering and affected pores of any size, leading to bimodal macro-mesopore size distributions and to a pronounced development of micropores. Disarrangement of the structures took place as a result of mineral matter removal altering mainly macroand mesopores, thus producing unimodal distributions. Structural changes occasioned by thermal treatment and demineralization were also reflected in modifications of the surface fractal dimensions estimated from mercury porosimetry data. Reactivity of chars for gasification was significantly affected by demineralization not only due to removal of metals, likely responsible for catalytic effects, but also induced by the structural modifications. Copyright © 2001 Taylor & Francis. |
| format |
JOUR |
| author |
Ochoa, J. Bonelli, P.R. Cassanello, M.C. Cukierman, A.L. |
| author_facet |
Ochoa, J. Bonelli, P.R. Cassanello, M.C. Cukierman, A.L. |
| author_sort |
Ochoa, J. |
| title |
Effect of thermal and acid treatments on properties of Argentinean low rank coals |
| title_short |
Effect of thermal and acid treatments on properties of Argentinean low rank coals |
| title_full |
Effect of thermal and acid treatments on properties of Argentinean low rank coals |
| title_fullStr |
Effect of thermal and acid treatments on properties of Argentinean low rank coals |
| title_full_unstemmed |
Effect of thermal and acid treatments on properties of Argentinean low rank coals |
| title_sort |
effect of thermal and acid treatments on properties of argentinean low rank coals |
| url |
http://hdl.handle.net/20.500.12110/paper_00908312_v23_n4_p383_Ochoa |
| work_keys_str_mv |
AT ochoaj effectofthermalandacidtreatmentsonpropertiesofargentineanlowrankcoals AT bonellipr effectofthermalandacidtreatmentsonpropertiesofargentineanlowrankcoals AT cassanellomc effectofthermalandacidtreatmentsonpropertiesofargentineanlowrankcoals AT cukiermanal effectofthermalandacidtreatmentsonpropertiesofargentineanlowrankcoals |
| _version_ |
1782026255270412288 |