Clarification of essential role and dynamic behavior of lattice oxygen species in metal oxide for catalytic oxidation reactions

为了阐明晶格氧物种在氧化反应中的本质作用和动力学行为，研究了CeO 2-ZrO 2复合氧化物对CO和碳氧化反应的催化性能。结果表明，CeO_2-ZrO_2颗粒中存在的晶格氧物种可以参与CO的氧化反应。另一方面，发现存在于CeO 2-ZrO 2颗粒的表面附近的晶格氧物种对作为固体型反应物的碳具有高反应性。CeO 2-ZrO 2晶格中氧物种的迁移率被认为是决定其氧化反应性能的重要因素。我们提出，CeO 2-ZrO 2颗粒的形态是负责晶格氧物种对各种反应物的反应性，导致开发高活性的氧化反应催化剂。

In order to clarify the essential role and dynamic behavior of lattice oxygen species for oxidation reactions, the catalytic performance of CeO2-ZrO2 mixed oxides for CO and carbon oxidation reactions was investigated. It was found that lattice oxygen specie, which present in the bulk of CeO2-ZrO2 particles, can participate in the oxidation of CO as gaseous reactant. On the other hand, lattice oxygen species present at the surface vicinity of CeO2-ZrO2 particles was found to be highly reactive toward carbon as solid-type reactant. The mobility of oxygen species in the lattice of CeO2-ZrO2 was suspected to be an important factor to determine the catalytic performance for oxidation reactions. We proposed that the morphology of CeO2-ZrO2 particles is responsible for the reactivity of lattice oxygen species toward various reactants, leading to development of highly active catalysts for oxidation reactions.