CaCo_xZr_1-xO_3-δ (x = 0, 0.3, 0.5, 0.7 and 0.9) perovskites with and without Pd doping were synthesized for the first time and reported here to show outstanding redox property and oxygen storage capacity (OSC) compared to the ceria-based oxygen storage materials (OSMs). The studied perovskites retain their main phase of orthorhombic Lakargiite CaZrO₃ structure, and were characterized by x-ray fluorescence (XRF), x-ray diffraction (XRD), temperature programmed reduction (TPR) and dynamic redox cycle measurements. Partial substitution of Co by Zr at B sites enhanced the perovskite structural crystallinity and stability, material reducibility and OSC properties, giving optimized OSM composition when x was around 0.5. Further kinetic studies showed a first order reaction mechanism with an activation energy (E_a) of 0.159 eV for CaCo_0.5Zr_0.5O_3-δ. For Pd-containing samples, Pd was present in both forms of bulk Pd²⁺ and surface Pd⁰, and the amount of surface Pd⁰ increased with increasing Pd loading. Pd dopant also facilitated the Co reduction and improved the catalyst reducibility. Under simulated exhaust conditions at fuel lean-rich conditions (stoichiometric numbers of 1.16, 1.07 and 0.95), Pd-doped CaCo_0.6-yZr_0.4Pd_yO₃ (y = 0.05 and 0.1) samples showed profound catalytic activity towards C₃H₆ and CO oxidation (T₅₀s < 280 °C at fuel lean-rich), suggesting their potential application for automotive emissions control.

首次 合成了具有和不具有Pd掺杂的CaCo _x Zr _{1- x} O _{3- δ}（x = 0、0.3、0.5、0.7和0.9）钙钛矿，并在此报道其具有出色的氧化还原性能和储氧能力（OSC）与基于二氧化铈的储氧材料（OSM）相比。研究的钙钛矿保留了正交晶的Lakargiite CaZrO ₃的主相。结构，并通过X射线荧光（XRF），X射线衍射（XRD），程序升温还原（TPR）和动态氧化还原循环测量来表征。在B位上Zr部分取代Co可以增强钙钛矿结构的结晶度和稳定性，材料的还原性和OSC性能，当x约为0.5时，OSM的成分得以优化。进一步的动力学研究表明，对于CaCo _0.5 Zr _0.5 O _{3- δ}，活化能（E _a）为0.159 eV的一级反应机理_。含Pd对于样品，钯存在于两种形式散装的Pd ²⁺和表面的Pd ⁰，和表面的钯的量⁰随着钯含量的增加而增加。Pd掺杂剂还促进了Co的还原并提高了催化剂的还原性。在富燃料稀薄条件下（化学计量数为1.16、1.07和0.95）的模拟排气条件下，掺Pd的CaCo _{0.6 -y} Zr _0.4 Pd _y O ₃（y  = 0.05和0.1）样品显示出对C ₃ H的深层催化活性。₆和CO氧化（贫油时T ₅₀ s <280°C），表明它们在汽车排放控制中的潜在应用。