期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 52, 期 -, 页码 344-356出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2016.07.018
关键词
CO2 capture; HMS; Mesoporous silica; Amine grafted; APTES; PEI
类别
资金
- Ministerio de Economia y Competitividad, Spain [CTQ2015-68951-C3-3-R]
- FEDER funds
- Excelencia, Junta de Andalucia [P12-RNM-1565]
- CAPES (Brazilian Ministry of Education)
- [295156 FP7-PEOPLE-2011-IRSES]
Hollow silica microspheres have been synthesized with high surface area and homogenous porous size distribution to be evaluated for their CO2 adsorption capacity. All adsorbents were well fitted to the Henry model, except HMS-F that displays the highest CO2 adsorption capacity, which was adjusted to the Langmuir model. In order to increase the CO2 capture, the hollow silica microspheres were functionalized via grafting 3-aminopropyltriethoxysilane (APTES) and via impregnation with polyethyleniminethylenediamine branched (PEI) or tetraethylenepentamine (TEPA). In all cases, the adsorption isotherms of the amine functionalized silica are fitted to the Dual-Langmuir model, where physical and chemical adsorption sites are described. The isotherms reveal that grafted-silicas with APTES display the coexistence of both adsorption sites, while the adsorption process of impregnated-silicas with PEI or TEPA are governed by chemical interactions. The adsorption isotherms show that the most promising adsorbent for CO2 capture is HMS-F-TiPB, which reached a CO2 adsorption capacity of 3.4 mmol g(-1) at 760 mmHg and 25 degrees C, maintaining this adsorption capacity 5 cycles. (C) 2016 Elsevier Ltd. All rights reserved.
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