Potassium-based sorbents using mesostructured γ-alumina supports for low temperature CO<inf>2</inf> capture

M. B. Durán-Guevara, J. Ortiz-Landeros, H. Pfeiffer, M. I. Espitia-Cabrera, M. E. Contreras-García

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

© 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. 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.
Original languageAmerican English
Pages (from-to)3036-3044
Number of pages2731
JournalCeramics International
DOIs
StatePublished - 1 Jan 2015
Externally publishedYes

Fingerprint

Aluminum Oxide
sorbents
Sorbents
Potassium
potassium
Alumina
aluminum oxides
Temperature
potassium 40
Surface-Active Agents
Powders
surfactants
Surface active agents
porosity
preparation
Steam
sorption
Polymethyl Methacrylate
Sols
water vapor

Cite this

Durán-Guevara, M. B. ; Ortiz-Landeros, J. ; Pfeiffer, H. ; Espitia-Cabrera, M. I. ; Contreras-García, M. E. / Potassium-based sorbents using mesostructured γ-alumina supports for low temperature CO<inf>2</inf> capture. In: Ceramics International. 2015 ; pp. 3036-3044.
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Potassium-based sorbents using mesostructured γ-alumina supports for low temperature CO<inf>2</inf> capture. / Durán-Guevara, M. B.; Ortiz-Landeros, J.; Pfeiffer, H.; Espitia-Cabrera, M. I.; Contreras-García, M. E.

In: Ceramics International, 01.01.2015, p. 3036-3044.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Durán-Guevara, M. B.

AU - Ortiz-Landeros, J.

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AB - © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. 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.

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