Oxygen Gateway Effect of CeO<sub>2</sub>/La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> Composite Oxygen Storage Materials
Dongjie Zhang (2410159)Takahiro Kawada (1492183)Fumihiko Yoshioka (2410162)Masato Machida (1489603)
Abstract
A synergistic enhancement in oxygen\nrelease/storage performance\nwas achieved with composites formed between CeO<sub>2</sub> as an\noxygen gateway and La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> as an\noxygen reservoir. CeO<sub>2</sub> smoothly transfers oxygen atoms\nbetween La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> and the gas phase,\nwhereas La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> stores a large amount\nof oxygen. The composite materials exhibited enhanced anaerobic CO\noxidation and reversible oxygen storage in the presence of impregnated\nPt catalysts as compared to their individual constituents (Pt/CeO<sub>2</sub> and Pt/La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub>). In situ\nX-ray diffraction and Raman experiments demonstrated that CeO<sub>2</sub> significantly accelerated the redox reaction between La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> (S<sup>6+</sup>) and La<sub>2</sub>O<sub>2</sub>S (S<sup>2–</sup>), while preserving its structure.\nThe reaction between CO and\nCeO<sub>2</sub>/<sup>18</sup>O-labeled La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> composites suggested that CO mainly reacted with the\nlattice oxygen atoms of CeO<sub>2</sub>, and the resulting oxygen\nvacancies were subsequently filled with oxygen atoms supplied by La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub>. This oxygen gateway effect of\nCeO<sub>2</sub> greatly enhanced the oxygen release/storage rates\nof La<sub>2</sub>O<sub>2</sub>SO<sub>4</sub>, while maintaining the\nhigh oxygen storage capacity, which is an advanced feature of oxysulfate\nmaterials. The synergistic effect is mostly pronounced when the two\ndifferent oxygen storage materials are in intimate contact to form\na three-phase boundary.
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