Potassium-based sorbents using mesostructured γ-alumina supports for low temperature CO2 capture
| Autor: | José Ortiz-Landeros, M.B. Durán-Guevara, Heriberto Pfeiffer, M.I. Espitia-Cabrera, M.E. Contreras-García |
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| Rok vydání: | 2015 |
| Předmět: |
Thermogravimetric analysis
Sorbent Materials science Process Chemistry and Technology Potassium Inorganic chemistry chemistry.chemical_element Sorption Soft chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Potassium carbonate chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Ceramics and Composites Porosity Mesoporous material |
| Zdroj: | Ceramics International. 41:3036-3044 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2014.10.140 |
| Popis: | In this work, a series of mesoporous alumina materials exhibiting high surface areas have been synthesized, characterized and used in the preparation of CO 2 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-Al 2 O 3 powders were composed of nanocrystals, and the samples presented high surface area values (238.6–496.7 m 2 g −1 ) produced by a high mesostructured order, depending on the surfactant used as structure-directing agent. Based on the textural features, selected γ-Al 2 O 3 materials were employed as supports for the preparation of potassium-based sorbents for CO 2 capture at low temperatures (30–80 °C). Potassium-loaded alumina supports were synthesized by a wet impregnation method, and the CO 2 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-Al 2 O 3 sorbent prepared with 40 wt% potassium content had a maximum CO 2 capture capacity of 4.03 mmol CO 2 /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-Al 2 O 3 supports could provide an enhancement of the CO 2 absorption properties. |
| Databáze: | OpenAIRE |
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