Department of Applied Chemistry, Faculty of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
ACS Appl Mater Interfaces. 2017 Nov 22;9(46):40344-40350. doi: 10.1021/acsami.7b14069. Epub 2017 Nov 7.
Novel PdO/LaSiCoO/γ-AlO catalysts with applications to methane combustion were developed. These materials were based on the use of LaSiCoO as a promoter because this compound has an oxide-ion conducting apatite-type structure that allows the smooth migration of active oxygen to the PdO activator. Co ions were also introduced into the original LaSiO lattice to enhance its redox properties. Temperature-programmed reduction measurements revealed that the oxygen supply was facilitated by introducing Co, where the reduction was observed at 290 °C for LaSiCoO (x = 1.0), whereas no reduction was observed below 460 °C for LaSiO. Among the samples synthesized in this work, PdO/LaSiCoO/γ-AlO (x = 1.0) exhibited the highest catalytic activity, allowing the complete oxidation of methane at 310 °C, a temperature 80 °C lower than the 390 °C required when employing PdO/LaSiO/γ-AlO.
开发了具有应用于甲烷燃烧的新型 PdO/LaSiCoO/γ-AlO 催化剂。这些材料基于使用 LaSiCoO 作为促进剂，因为该化合物具有氧化物离子传导的磷灰石型结构，允许活性氧顺利迁移到 PdO 活化剂。还将 Co 离子引入到原始 LaSiO 晶格中以增强其氧化还原性能。程序升温还原测量表明，引入 Co 促进了氧的供应，其中 LaSiCoO（x = 1.0）在 290°C 下观察到还原，而在 460°C 以下 LaSiO 则未观察到还原。在所合成的样品中，PdO/LaSiCoO/γ-AlO（x = 1.0）表现出最高的催化活性，允许甲烷在 310°C 下完全氧化，比使用 PdO/LaSiO/γ-AlO 时所需的 390°C 低 80°C。
