We have used liquid-feed Flame Spray Pyrolysis (FSP) to prepare a series of high surface area, nanocrystalline perovskites of general formula AA’BB’O₃ (A = La, A’ = Ca, Sr, Y, Ce; B = B’ = Mn, Fe, Co, Ni). Use of the FSP method has allowed the systematic investigation of changing both A site dopant and B site cation while maintaining high surface areas. The resulting perovskites have been evaluated for their CO, HC and NO (three-way catalyst (TWC)) activity under simulated gasoline exhaust feeds, their oxygen storage properties and their stability to high temperature redox conditions. The activity of the perovskites has been compared to a low loaded commercial PdRh TWC and were found to be significantly poorer after mild calcination and very significantly deactivated after high temperature hydrothermal redox ageing.

我们已经使用液体进料火焰喷雾热解法（FSP）制备了一系列高表面积，通式为AA'BB'O _3的纳米晶钙钛矿（A ＝ La，A′＝ Ca，Sr，Y，Ce； B ＝ B′＝ Mn，Fe，Co，Ni）。FSP方法的使用允许在保持高表面积的同时改变A位掺杂剂和B位阳离子的系统研究。已评估了所得钙钛矿在模拟汽油尾气进料中的CO，HC和NO（三元催化剂（TWC））活性，它们的储氧性能以及在高温氧化还原条件下的稳定性。已将钙钛矿的活性与低负载的商业PdRh TWC进行了比较，发现钙钛矿的活性在轻度煅烧后明显较弱，而在高温水热氧化还原时效后则明显失活。