Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

Abstract

Hexagonal Y1−xRxMnO3+δ (R: other than Y rare earth elements) oxides have been recently introduced as promising oxygen storage materials that can be utilized in the temperature swing processes for the oxygen separation and air enrichment. In the present work, the average and local structures of Tb- and Ce-substituted Y0.7Tb0.15Ce0.15MnO3+δ and Y0.6Tb0.2Ce0.2MnO3+δ materials were studied, and their oxygen storage-related properties have been evaluated. The fully oxidized samples show the presence of a significant amount of the highly oxygen-loaded the so-called Hex3 phase, attaining an average oxygen content of δ ≈ 0.41 for both compositions. Extensive studies of the temperature swing process conducted in air and N2 over the temperature range of 180–360 °C revealed large and reversible oxygen content changes taking place with only a small temperature differences and the high dependence on the oxygen partial pressure. Significant for practical performance, the highest reported for this class of compounds, oxygen storage capacity of 1900 μmol O g−1 in air was obtained for the optimized materials and swing process. In the combined temperature–oxygen partial pressure swing process, the oxygen storage capacity of 1200 μmol O g−1 was achieved.

Improvement of the Oxygen Storage/Release Speed of YBaCo4O7+δ Synthesized by a Glycine-Complex Decomposition Method

“…The results indicated that the low-temperature sample possessed excellent reversibility and structural stability in oxygen absorption/desorption up to 10 cycles. In addition, a temperature swing adsorption process was also performed to investigate the oxygen storage/release performance . The sample is heated to 500 °C under a nitrogen atmosphere and then cooled to 220 °C in O 2 gas flow maintained for 20 min, subsequently heated to 360 °C in N 2 gas flow maintained for 30 min for five cycles, as presented in Figure b.…”

Tunable Oxygen Intake/Release Characteristics of Brownmillerite-Type Ca2AlMnO5+δ Involving Atomic Defect Formations

“…In O-PSA, gaseous oxygen is separated with the use of materials capable of absorbing oxygen only. Oxygen storage materials (OSMs) have attracted attention as absorbents used therein. − …”

Investigation of Sr0.7Ca0.3FeO3 Oxygen Carriers with Variable Cobalt B‐Site Substitution

“…Perovskite‐based ABO 3 oxygen carriers have garnered much attention in the past decade for their rapid kinetics and resilience during repeated uptake/release cycling due to the limited structural rearrangement that occurs during oxygen gain/loss [1–24] . The efficacy of a perovskite oxygen carrier is dependent upon the identity of both the A‐ and B‐site elements chosen, with common options of Ba, Sr, Ca, and La on the A‐site, and Fe, Co, and Mn on the B‐site [1–8] .…”