resumo
This work investigates the preparation and characterization of composite membranes for high-temperature CO2 separation. Materials were prepared using Gd-doped ceria (CGO) and a eutectic mixture of Na2CO3 and Li2CO3 (NLC) as ceramic and molten phases, respectively. Membranes were obtained through a two-step process: initial consolidation of the ceramic phase followed by impregnation with molten carbonates. Various processing conditions were optimized to achieve homogeneous and strong ceramic skeletons using organic pore-forming agents and sintering aids. Sintering schedules were chosen with respect to each processing condition, namely 1400 degrees C and 900 degrees C for materials with organic agent and sintering aids, respectively. Consolidated skeletons and resulting membranes were similar in densification (approximate to 70 % and approximate to 95 %, respectively). Comparable impedance spectroscopy in air and in a CO2-rich atmosphere showed no meaningful change in bulk other than a slight change in conductivity at temperatures above the melting point of salts (500 degrees C). The ambipolar conductivity and tortuosity analysis provides insights into the behavior of both the isolated ceramic phase and the composite, facilitating an understanding of the microstructural effect on the selected materials.
palavras-chave
GRAIN-BOUNDARIES; CARBON CAPTURE; PORE FORMERS; ELECTROLYTES; MEMBRANES; CERAMICS; OXIDE; PERFORMANCE; GAS; CONDUCTIVITY
categoria
Chemistry; Electrochemistry; Energy & Fuels
autores
Tidei, HJ; Yang, T; Grilo, JPF
nossos autores
João Grilo
Investigador JúniorProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MCTES (PIDDAC) . The authors acknowledge the national funding from FCT through the PTDC/EME-REN/1497/2021 project (Power Phoenix Battery-A Full Solid State Grid-scale Storage Solution) . Joao Grilo acknowledges the support of the FCT- 2021.04328.CEECIND grant.