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Previous issue date: 2018-07-27 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES === An efficient and low-cost strategy in the search for processes for the separation of CO2 from the natural gas is the physical immobilization of the ionic liquids (ILs) in solid materials. Mesoporous silicas are interesting materials to be used as supports because they have high surface area and pore volume. Besides that, the ionic liquids have been studied and appointed as a potential substitute for the commercial solvents, due to their characteristics and the possibility of combining a selection of anions and cations. In this case, anions having direct interference in the sorption capacity. In this context, the objective of this study was to evaluate the effect of the physical immobilization of two ionic liquids with different anions (bmim [Cl] and bmim [OAc]) on two mesoporous supports (commercial silica SBA-15 and silica extracted from rice husk) for the separation of CO2 from the natural gas through the experimental determination of CO2 sorption, selectivity (CO2/CH4) and sorption kinetics. The results have shown that pure solid supports have the greatest sorption capacity of CO2 when compared to immobilized. However, the CO2 removal efficiency in the CO2/CH4 mixture of the immobilized supports (evaluated by the selectivity) improves considerably. The best selectivity results were obtained for supports immobilized with the IL bmim[Cl] and the contribuition of SIL-Cl (3.03 ? 0.12) to separation performance (CO2/CH4) is similar to SBA-Cl (3.29 ? 0.39). The materials supported with ionic liquids have also presented fastest sorption kinetics when compared to the pure ILs. Also, the SIL-Cl was the most interesting combination of support and ionic liquid, when considering these parameters and the cost. === Uma estrat?gia interessante na busca de processos para separa??o de CO2 do g?s natural mais eficiente e de baixo custo ? a imobiliza??o f?sica de l?quidos i?nicos (LIs) em materiais s?lidos. As s?licas mesoporosas s?o materiais interessantes para a utiliza??o como suportes, pois apresentam grande ?rea superficial e volume de poros, j? os l?quidos i?nicos v?m sendo estudados e apontados como potencial substituinte aos solventes comerciais, devido a suas caracter?sticas e possibilidade de combina??o atrav?s da escolha de c?tions e ?nions, sendo que os ?nions t?m interfer?ncia direta na capacidade de sor??o. Neste contexto, o objetivo deste trabalho foi avaliar o efeito da imobiliza??o f?sica de dois l?quidos i?nicos com ?nions diferentes (bmim[Cl] e bmim[OAc]) em dois suportes mesoporosos (s?lica comercial SBA-15 e s?lica extra?da da casca de arroz) para separa??o de CO2 do g?s natural atrav?s da determina??o experimental da sor??o de CO2, seletividade (CO2/CH4) e cin?tica de sor??o. Os resultados mostraram que os suportes s?lidos puros tem a maior capacidade de sor??o do CO2 quando comparados com os imobilizados, entretanto a efici?ncia de remo??o do CO2 na mistura CO2/CH4 (avaliada pela seletividade) dos suportes imobilizados melhora consideravelmente. Os melhores resultados de seletividade foram obtidos com os suportes imobilizados com o LI bmim[Cl] e a contribui??o de SIL-Cl (3,03 ? 0,12) para a separa??o (CO2/CH4) foi similar a SBA-Cl (3,29 ? 0,39). Os materiais suportados com l?quidos i?nicos tamb?m apresentaram cin?tica de sor??o r?pida quando comparados com os LIs puros, sendo SIL-Cl a combina??o mais interessante de suporte e l?quido i?nico, considerando estes par?metros e o custo.
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