Long-term stability of iron-doped calcium titanate CaTi0.9Fe0.1O3−δ oxygen transport membranes under non-reactive and reactive atmospheres

C. Salles (1, 2) , Marlu César Steil (2) , Jacques Fouletier (2) , Mathieu Duttine (3) , Alain Wattiaux (3) , Daniel Marinha (1)

1 LSFC - Laboratoire de Synthèse et Fonctionnalisation des Céramiques
2 MIEL - Matériaux Interfaces ELectrochimie
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Oxygen transport membranes (OTM) are widely considered as a possible solution to limit the carbon footprint, but are notoriously afflicted by performance issues due to chemical instability observed during long-term operation. This paper reports on the stability of an OTM made of CaTi0.9Fe0.1O3−δ (CTF), and addresses its applicability. The redox stability of CTF was investigated using thermal gravimetry up to 1000 °C under air and H2, coupled with XRD and Mössbauer analyses. The redox potential of iron was measured using an electrochemical potential relaxation as a function of temperature. The baseline oxygen semi-permeability flux of dense CTF membranes was measured in inert atmospheres (air/argon or air/helium), and the long-term stability established for up to 1600 h under simulated operation atmospheres containing CO, CO2, H2 and CH4. CTF shows a remarkable performance stability and post mortem XRD, SEM-EDS and Raman analyses show no evidence of decomposition or reaction byproducts.

Mots clés: Oxygen transport membranes; Oxycombustion; Methane; Stability; Ageing; CTF; OTM

Domaines: Matériaux

C. Salles, Marlu César Steil, Jacques Fouletier, Mathieu Duttine, Alain Wattiaux, et al.. Long-term stability of iron-doped calcium titanate CaTi0.9Fe0.1O3−δ oxygen transport membranes under non-reactive and reactive atmospheres. Journal of Membrane Science, 2019, 583, pp.171-179. ⟨10.1016/j.memsci.2019.04.049⟩. ⟨hal-02131783⟩