Evidence of a Strong Correlation Between Oxygen Nonstoichiometry (d) and Oxygen Uptake Capacities of La_(1-x)Sr_xCo_(0.2)Fe_(0.2)O_(3-d) oxides (0.1 < Sr_x < 0.4)

摘要

Recently, there has been a growing interest in utilizing nonstoichiometric La_(1-x)Sr_xCo_(0.2)Fe_(0.2)O_(3-d) perovskite-type oxide as sorbents for high-temperature production of oxygen-enriched carbon dioxide stream. During the past decades, many studies have been conducted on these solid solutions, and in order to achieve higher oxygen uptake capacities, the La~(3+) lanthanide was substituted by bivalent Sr~(2+) alkaline-earth ions to decrease the ionicity of the Ln-O bond which could result in an increased number of hole.