Stability of SrFeO₃‐Based Materials in H₂O/CO₂‐Containing Atmospheres at High Temperatures and Pressures

Abstract

The chemical stability of SrFeO3‐based perovskites in H2O‐ and CO2‐containing atmospheres at high temperatures and pressures has been examined. The extent of reaction as a function of pCO2, pH2O, temperature, and time has been determined. Either strontium carbonate or Sr(OH)2·H2O was observed on sample surfaces after exposure. Observation of two different reaction‐rate behaviors could be explained by the formation of different products. The stability of the perovskite has been found to increase when the activity of Sr is decreased. Chemical stability in H2O/CO2 is important to understand in order to use these membrane materials for syngas production.

Oxygen permeation and stability investigations on MIEC membrane materials under operating conditions for power plant processes

“…A formation of carbonates could not been detected [11,12]. Further publications discuss the influence of humidified atmospheres with different material compositions comparable to the BSCF-material [13][14][15][16]. In the field of oxygen sensors and cathode materials for fuel cells the impact of CO 2 has been studied as well [17][18][19][20].…”

The Interaction Between SrFeCo0.5O x Ceramic Membranes and Pt/CeZrO2 During Syngas Production from Methane

“…Previous studies have suggested that the hydrogen formed during the reaction can interact with oxygen species on the membrane surface to form water [2]. In addition, it has been suggested that CO 2 and CO can form carbonate species on the membrane surface [18,19]. The formation of H 2 O and the adsorption and potential reaction of CO and CO 2 on the membrane surface can significantly change the product composition and the overall reaction scheme.…”

Stability of SrFeO3 based materials in the presence of SiOx species in humid atmosphere at high temperatures and pressures

“…Stability of this material in humid atmospheres in the presence of CO 2 is presented in a separate paper. 13 …”