Chemical looping air separation with Sr0.8Ca0.2Fe0.9Co0.1O3-δ perovskite sorbent: Packed bed modeling, verification, and optimization

Activation in the rate of oxygen release of Sr0.8Ca0.2FeO3−δ through removal of secondary surface species with thermal treatment in a CO2-free atmosphere

“…Importantly, our findings may explain why the activation phenomenon of Sr-based perovskites has been overlooked in other chemical looping studies, including theoretical works. 12,77 Often much higher operating temperatures were used ( T > 600 °C 78–80 ) such that the material activated already upon heating before the cycling experiment started, 81,82 and during the cycling experiment no stable surface carbonate species were formed. Further, when using high purity gases that do not contain CO 2 (laboratory experiments as opposed to practical industrial testing) such activation behavior would be absent.…”

A Bayesian method for selecting data points for thermodynamic modeling of off-stoichiometric metal oxides

“…The cyclic reduction/re-oxidation of metal oxide (M x O y ) materials forms the backbone of a vast number of chemical processes, such as gas reforming, 1,2 gas separation and pumping, [3][4][5][6][7][8][9] energy production and storage, [10][11][12][13][14][15][16][17] and many catalytic processes, particularly those which operate on Mars-van Krevelen-like mechanisms. [18][19][20][21][22][23][24] The performance of these materials is directly related to their partial molar reduction thermodynamics, i.e.…”

Structural and Thermodynamic Assessment of Ba and Ba/Mg Substituted SrFeO3−δ for “Low-Temperature” Chemical Looping Air Separation

“…1,2,17,11,6 Oxide-based sorbents can yield high-purity oxygen (>99%), while consuming less energy compared to zeolite or activated carbon, on account of their high sorption selectivity for oxygen over nitrogen. 11,18 CLAS relies on a two-step redox cycle of reversible reduction and oxidation reactions that can be operated under pressure-or temperature-swing modes. A typical operating scheme of CLAS is presented in Figure 1.…”

“…Moreover, conventional PSA is even more energy-intensive than cryogenic distillation. Lately, there has been a growing interest in the high-temperature operation of PSA using oxide-based ceramic sorbents, also known as chemical looping air separation (CLAS), owing to the benefits it offers in various industrial processes that require oxygen-enriched air at elevated temperatures (e.g., >300 °C). ,,,, Oxide-based sorbents can yield high-purity oxygen (>99%), while consuming less energy compared to zeolite or activated carbon, on account of their high sorption selectivity for oxygen over nitrogen. , CLAS relies on a two-step redox cycle of reversible reduction and oxidation reactions that can be operated under pressure- or temperature-swing modes. A typical operating scheme of CLAS is presented in Figure .…”