煅烧
催化作用
热稳定性
化学工程
材料科学
金红石
降水
无机化学
萤石
固溶体
化学
冶金
有机化学
物理
工程类
气象学
作者
Elena M. Slavinskaya,А. В. Задесенец,О. А. Стонкус,A. I. Stadnichenko,Andrey Shchukarev,Yu. V. Shubin,S. V. Korenev,A. I. Boronin
标识
DOI:10.1016/j.apcatb.2020.119275
摘要
In this work, the counter precipitation method was used to synthesise Pd/CeO2-SnO2 catalysts, which possess excellent low-temperature activity and high thermal stability. It was revealed that calcination of Pd/CeO2-SnO2 catalysts at 800−1000 °C induces significant growth of catalytic activity in CO oxidation at T<150 °C. This effect of thermal activation for Pd/CeO2-SnO2 catalysts was enhanced when water was admitted to the reaction mixture. In the presence of water the T50 value for the Pd/CeO2-SnO2 catalyst calcined at 900 °C becomes 45 °C lower than for the Pd/CeO2 catalyst. It was found that calcination of the catalysts at T<600 °C leads to the formation of solid solutions based on the fluorite and rutile structures. As the calcination temperature is raised above 600 °C, the solid solutions decompose with formation of catalytically active PdxCe1-xO2-δdispersed phase on the surface of SnO2 nanoparticles. The formed nanoheterogeneous structure provides both high thermal stability and high water resistance of Pd/CeO2-SnO2 catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI