With the assistance of nitrate additives (KNO₃, NaNO₃, Ca(NO₃)₂ or Mg(NO₃)₂), perovskite LaCoO₃, which has a 3D porous structure and relatively high surface area (around 20 m²/g) was successfully synthesized at 500 °C via a sol-gel process. The results of thermal gravimetric analysis indicated that nitrates (especially NaNO₃ and KNO₃) acted as combustion aids, which significantly lowered down the crystallization temperature of LaCoO₃ by intensifying the decomposition of organic ingredients. Unlike other researches, the metal ions from the nitrate additives did not dope into the crystal lattice of perovskite and it was found that the remained nitrate additives would dramatically inhibit the LaCoO₃ catalytic activity on benzene oxidation. However, after removal of these remained nitrate additives by rinsing with deionized water, LaCoO₃ derived from our proposed salt-assisted sol-gel method exhibited an excellent catalytic activity.

在硝酸盐添加剂（KNO ₃，NaNO ₃，Ca（NO ₃）₂或Mg（NO ₃）₂）的辅助下，钙钛矿型LaCoO ₃具有3D多孔结构和较高的表面积（约20 m ² / g）通过溶胶-凝胶法在500°C下成功合成了）。热重分析结果表明，硝酸盐（尤其是NaNO ₃和KNO ₃）起助燃剂作用，大大降低了LaCoO ₃的结晶温度。通过加强有机成分的分解。与其他研究不同，硝酸盐添加剂中的金属离子没有掺杂到钙钛矿的晶格中，发现残留的硝酸盐添加剂会极大地抑制LaCoO ₃对苯氧化的催化活性。但是，通过用去离子水冲洗去除残留的硝酸盐添加剂后，源自我们提出的盐辅助溶胶-凝胶法的LaCoO ₃表现出出色的催化活性。