TY - JOUR
T1 - Potassium-based sorbents using mesostructured γ-alumina supports for low temperature CO2 capture
AU - Durán-Guevara, M. B.
AU - Ortiz-Landeros, J.
AU - Pfeiffer, H.
AU - Espitia-Cabrera, M. I.
AU - Contreras-García, M. E.
N1 - Publisher Copyright:
© 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - In this work, a series of mesoporous alumina materials exhibiting high surface areas have been synthesized, characterized and used in the preparation of CO2 sorbents. The mesostructured powders were prepared through a soft chemistry route, employing aluminum tri-sec-butoxide-derived sol precursors in the presence of different surfactants. Structural and microstructural characterization techniques showed that γ-Al2O3 powders were composed of nanocrystals, and the samples presented high surface area values (238.6-496.7 m2 g-1) produced by a high mesostructured order, depending on the surfactant used as structure-directing agent. Based on the textural features, selected γ-Al2O3 materials were employed as supports for the preparation of potassium-based sorbents for CO2 capture at low temperatures (30-80 °C). Potassium-loaded alumina supports were synthesized by a wet impregnation method, and the CO2 sorption tests were conducted via thermogravimetric analysis. The surface area and pore volume of the potassium-impregnated supports experienced a noticeable reduction, in comparison with the original values, suggesting the inclusion of potassium inside the support porosity. Nevertheless, the sorbents showed excellent reactivity; in fact, the potassium/γ-Al2O3 sorbent prepared with 40 wt% potassium content had a maximum CO2 capture capacity of 4.03 mmol CO2/g sorbent at the relatively low temperature of 80 °C in the presence of water vapor. These results suggest that both the potassium content and textural properties of mesostructured γ-Al2O3 supports could provide an enhancement of the CO2 absorption properties.
AB - In this work, a series of mesoporous alumina materials exhibiting high surface areas have been synthesized, characterized and used in the preparation of CO2 sorbents. The mesostructured powders were prepared through a soft chemistry route, employing aluminum tri-sec-butoxide-derived sol precursors in the presence of different surfactants. Structural and microstructural characterization techniques showed that γ-Al2O3 powders were composed of nanocrystals, and the samples presented high surface area values (238.6-496.7 m2 g-1) produced by a high mesostructured order, depending on the surfactant used as structure-directing agent. Based on the textural features, selected γ-Al2O3 materials were employed as supports for the preparation of potassium-based sorbents for CO2 capture at low temperatures (30-80 °C). Potassium-loaded alumina supports were synthesized by a wet impregnation method, and the CO2 sorption tests were conducted via thermogravimetric analysis. The surface area and pore volume of the potassium-impregnated supports experienced a noticeable reduction, in comparison with the original values, suggesting the inclusion of potassium inside the support porosity. Nevertheless, the sorbents showed excellent reactivity; in fact, the potassium/γ-Al2O3 sorbent prepared with 40 wt% potassium content had a maximum CO2 capture capacity of 4.03 mmol CO2/g sorbent at the relatively low temperature of 80 °C in the presence of water vapor. These results suggest that both the potassium content and textural properties of mesostructured γ-Al2O3 supports could provide an enhancement of the CO2 absorption properties.
KW - CO capture
KW - Potassium carbonate
KW - Solid sorbent
UR - http://www.scopus.com/inward/record.url?scp=84919444245&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2014.10.140
DO - 10.1016/j.ceramint.2014.10.140
M3 - Artículo
SN - 0272-8842
VL - 41
SP - 3036
EP - 3044
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -