Ag and Co co-doped La_1-xAg_xMn_1-yCo_yO_3-δ perovskites were prepared by the citric acid sol–gel method. The maximum solubility of Ag⁺ in LaMnO₃ decreased with the increase of Co doped in B-site, which lead to the exsolution of excess Ag⁺ from A-site of perovskite. The exsolution progress is more favorable to the formation of uniform and stable Ag nanoparticles on the perovskite substrate. The non-thermal plasma (NTP) assisted La_1-xAg_xMn_1-yCo_yO_3-δ for soot catalytic combustion had been investigated under diesel exhaust gas conditions. When La_1-xAg_xMn_1-yCo_yO_3-δ was utilized as the catalyst without NTP, the soot could hardly be oxidized at 200 °C. However, when La_1-xAg_xMn_1-yCo_yO_3-δ was combined with NTP, the efficiency of soot removal was dramatically improved. The NTP-La_0.5Ag_0.5Mn_0.8Co_0.2O_3-δ hybrid had the highest soot removal efficiency and CO₂ selectivity. The combination of NTP and La_1-xAg_xMn_1-yCo_yO_3-δ could form a synergistic catalytic effect, which significantly promoted the combustion of soot at low temperature. The results of characterization and experiments indicated that the synergistic catalytic performance depended on the coordination of short-living species in plasma, adsorbed oxygen and Ag nanoparticles on surface of La_1-xAg_xMn_1-yCo_yO_3-δ. Based on these results, the reaction mechanism of plasma-catalyst hybrid for soot catalytic combustion was proposed.

用柠檬酸溶胶-凝胶法制备了Ag和Co共掺杂的La _1-x Ag _x Mn _1-y Co _y O3 _-δ钙钛矿。Ag ⁺在LaMnO _3中的最大溶解度随B位掺杂Co的增加而降低，从而导致钙钛矿A位上过量的Ag ⁺溶出。溶出进展更有利于在钙钛矿基质上形成均匀且稳定的Ag纳米颗粒。非热等离子体（NTP）辅助的La _1-x Ag _x Mn _1-y Co _y O3 _-δ在柴油机废气条件下研究了用于烟灰的催化燃烧。当使用La _1-x Ag _x Mn _1-y Co _y O3 _-δ作为没有NTP的催化剂时，烟灰在200°C下几乎不被氧化。但是，将La _1-x Ag _x Mn _1-y Co _y O3 _-δ与NTP结合使用时，烟尘去除效率得到了显着提高。NTP-La _0.5 Ag _0.5 Mn _0.8 Co _0.2 O3 _-δ杂种具有最高的除烟效率和CO ₂选择性。NTP和La _1-x Ag _x Mn _1-y Co _y O3 _-δ的组合可形成协同催化作用，从而显着促进了低温下烟so的燃烧。表征和实验结果表明，协同催化性能取决于La _1-x Ag _x Mn _1-y Co _y O3 _-δ表面上的短寿命物质，吸附的氧和Ag纳米粒子的配合。基于这些结果，提出了等离子-催化剂杂化体烟灰催化燃烧的反应机理。