A molten salt method was adopted to prepare porous LaMnO₃ and LaMn_0.8Fe_0.2O₃ with different morphologies, using hierarchical porous MnO₂ microspheres (S80, S90, S80-1) as precursors in eutectic NaNO₃-KNO₃, separately. The results show that perovskite phase LaMn_0.8Fe_0.2O₃ can be formed at 435.5 °C. Spherical porous LaMn_0.8Fe_0.2O₃ can be synthesized at 450 °C for 4 h, which was composed of aggregated nanocrystallites. With morphologies similar to S90 and S80-1, LaMnO₃ can also be prepared at 450 °C and 500 °C for 4, respectively. Additionally, the sample LaMn_0.8Fe_0.2O₃ also displayed a higher BET surface area of 55.73 m²/g with an average pore size of about 9.38 nm. The results of CO conversion on each sample showed that LaMn_0.8Fe_0.2O₃ owned the best catalytic activity (T₅₀ = 187 °C and T₉₀ = 200 °C) and it was available to improve the catalytic activity through reducing the molar ratio of La(NO₃)₃·6H₂O and S80-1 to lower the amount of La(OH)₂NO₃.

采用共熔NaNO ₃ -KNO _3的分层多孔MnO ₂微球（S80，S90，S80-1）为前体，采用熔融盐法制备了不同形态的多孔LaMnO ₃和LaMn _0.8 Fe _0.2 O ₃。结果表明，在435.5℃下可以形成钙钛矿相LaMn _0.8 Fe _0.2 O ₃。球形多孔LaMn _0.8 Fe _0.2 O ₃可以在450°C下合成4 h，由聚集的纳米微晶组成。具有类似于S90和S80-1，LaMnO ₃也可以分别在450℃和500℃下制备4。另外，样品LaMn _0.8 Fe _0.2 O ₃还显示出55.73m ² / g的更高的BET表面积，具有约9.38nm的平均孔径。每个样品的CO转化结果表明，LaMn _0.8 Fe _0.2 O ₃具有最佳的催化活性（T ₅₀ = 187°C和T ₉₀ = 200°C），并且可以通过降低摩尔比来提高催化活性。的La（NO ₃）₃ ·6H _2的O和S80-1降低La（OH）₂ NO _3的量。