CARVALHO, SABRINA G.M.MUCCILLO, ELIANA N.S.FONSECA, FABIO C.MULLER, MICHAELSCHULZE-KUPPERS, FALKBAUMANN, STEFANMEULENBERG, WILHELM A.GUILLON, OLIVIERMUCCILLO, REGINALDO2022-05-022022-05-022022CARVALHO, SABRINA G.M.; MUCCILLO, ELIANA N.S.; FONSECA, FABIO C.; MULLER, MICHAEL; SCHULZE-KUPPERS, FALK; BAUMANN, STEFAN; MEULENBERG, WILHELM A.; GUILLON, OLIVIER; MUCCILLO, REGINALDO. Tape-casting and freeze-drying gadolinia-doped ceria composite membranes for carbon dioxide permeation. <b>Journal of Membrane Science</b>, v. 648, p. 1-10, 2022. DOI: <a href="https://dx.doi.org/10.1016/j.memsci.2022.120355">10.1016/j.memsci.2022.120355</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/33006.0376-7388http://repositorio.ipen.br/handle/123456789/33006Porous ceria: 20 mol% gadolinia (20GDC) ceramic membranes were prepared by tape casting (TC) and freeze-drying (FD) techniques, obtaining ceramic matrices with randomly dispersed round pores and with an aligned pore structure, respectively. Samples were sintered at 1450 °C, followed by infiltration of molten eutectic sodium-lithium carbonates (NLC). The pore morphology of 20GDC-TC and 20GDC-FD composite membranes was evaluated by analysis of scanning electron microscopy images. The electrical resistivity was determined by electrochemical impedance spectroscopy in the 1 Hz - 10 MHz frequency range from 300 °C to 700 °C, covering the solid-to-molten NLC temperature range, showing that the aligned pore structure improved the conductivity of the ceramic matrix in addition to facilitating molten carbonate infiltration, improving the total (bulk + interfaces) electrical conductivity of the composite membrane. Permeation experiments showed high CO2 permeation rates reached 5.35 × 10−7 mol m−2 s−1 Pa−1 at 800 °C. The infiltration of molten sodium-lithium carbonate in gadolinium-doped ceria prepared by the freeze-drying technique is proposed as an optimized procedure for producing membranes for carbon dioxide separation.1-10openAccessceriumdoped materialsgadolinium oxidesmolten saltscarbon dioxidecomposite materialsArtigo de periódico64810.1016/j.memsci.2022.1203550000-0002-8598-279X0000-0003-0708-20210000-0001-9219-388Xhttps://orcid.org/0000-0002-8598-279Xhttps://orcid.org/0000-0003-0708-2021https://orcid.org/0000-0001-9219-388X94.295.25