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 Pd_xCe_1-xO_2-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.

本文采用反沉淀法合成了具有优良的低温活性和高热稳定性的Pd / CeO ₂ -SnO ₂催化剂。结果表明，Pd / CeO ₂ -SnO ₂催化剂在800-1000°C下煅烧会导致T <150°C的CO氧化催化活性显着增长。当将水引入反应混合物中时，Pd / CeO ₂ -SnO ₂催化剂的热活化作用增强。在水存在下，在900°C下煅烧的Pd / CeO ₂ -SnO ₂催化剂的T ₅₀值比Pd / CeO ₂降低45°C催化剂。发现在T ＜600℃下催化剂的煅烧导致形成基于萤石和金红石结构的固溶体。当煅烧温度升高到600℃以上时，固溶体分解，并在SnO ₂纳米颗粒表面形成催化活性的Pd _x Ce _1-x O _{2 - δ}分散相。所形成的纳米异质结构提供了Pd / CeO ₂ -SnO ₂催化剂的高热稳定性和高耐水性。