Development of environmental catalysts for oxidation of organic compounds with a focus on lattice oxygen

抄録

Catalytic oxidation is an important method for eliminating environmentally harmful organic compounds, such as methane and volatile organic compounds, emitted by human activities. To decompose such organic compounds effectively, novel catalysts have been developed using promoters that can facilitate oxidation by supplying oxygen species in their lattice. By the introduction of oxygen vacancies for facilitation of oxide ion migration and enhancement of redox properties, oxygen release and storage abilities of the CeO₂–ZrO₂ based promoter have been reported to be significantly improved, resulting in a high catalytic activity for the oxidation of organic compounds in gaseous and liquid phases. This review article presents new developments for CeO₂–ZrO₂ based catalysts aimed at oxygen supply. In addition, the development of novel apatite-type La₁₀Si₆O₂₇ based solids with an oxide ion-conducting pathway in the lattice, which can accelerate catalytic oxidation, is presented.