Catalytic performance of fresh and aged impregnated Pd/LaFeO₃ and sol gel LaFe_1−xPd_xO₃ Natural Gas Vehicle Three-Way Catalysts, in powder form and wash-coated on ceramic monolith, have been investigated. Aging at 980 °C in wet atmosphere has no detrimental effect on the structural properties with the preservation of the orthorhombic structure of the perovskite. On the other hand, a loss of specific surface area is accompanied with surface Pd enrichment on LaFe_1−xPd_xO₃ through ex solution process. It was found that the mode of Pd incorporation and subsequent aging has a limited impact on the catalytic performance at low temperature for the NO/H₂ reaction. On the other hand, sharp rate enhancement in NO and methane conversion occurs at high temperature related to change in the reaction pathway from methane combustion to reforming reactions producing more efficient reducing agents to reduce NO. Such behaviour has been explained by the coexistence of palladium stabilized at different oxidation state at the surface and inside the perovskite structure.

研究了新鲜和老化的浸渍Pd / LaFeO ₃和溶胶凝胶LaFe _1-x Pd _x O ₃天然气车辆三效催化剂的催化性能，这些催化剂呈粉末状并洗涂在陶瓷整料上。在980°C的潮湿环境中老化不会对钙钛矿的正交晶结构造成不利影响，而保留钙钛矿的正交晶结构。另一方面，比表面积的损失伴随着通过Ex溶液法在LaFe _1-x Pd _x O ₃上的表面Pd富集。发现Pd的掺入方式和随后的时效对NO / H _2的低温催化性能影响有限。反应。另一方面，与甲烷燃烧到重整反应的反应路径的变化相关的高温下，NO和甲烷转化率的急剧增加发生在高温下，从而产生更有效的还原剂来还原NO。通过钙钛矿结构的表面和内部以不同氧化态稳定的钯的共存可以解释这种行为。