Co₃O₄ shows excellent catalytic activity for N₂O decomposition, in which it is urgently needed to develop novel efficient catalysts/supports with cheap and environmentally-friendly properties. Herein, Co₃O₄ nanoparticles decorated eggshell catalysts (Co₃O₄/eggshell-GR, Co₃O₄/eggshell-IM, and Co₃O₄/eggshell-DP) were prepared using simple grinding, impregnation, and deposition-precipitation methods, where waste eggshells were used as an effective support and reaction-promoter. The results indicated that the preparation methods significantly influenced the catalytic activity of Co₃O₄/eggshell catalysts; the highest activity was obtained over the Co₃O₄/eggshell-DP. The activity of Co₃O₄/eggshell-DP was comparable to that of pure Co₃O₄. More importantly, its specific activity was about 7.3 times that of Co₃O₄ at 400 °C. The examined Co₃O₄/eggshell-DP also displayed outstanding stability and anti-poisoning property in NO, O₂, and/or H₂O-containing atmospheres. It was also verified that the excellent activity of Co₃O₄/eggshell-DP correlated with the unique structure of the eggshell and the close incorporation between CaCO₃ and Co₃O₄. The Co₃O₄/eggshell-DP catalyst owned abundant Co₃O₄ nanoparticles, more Co³⁺ species, and excellent redox performance, promoting the conversion of N₂O at a lower temperature. The presence of abundant surface basic sites and a larger amount of oxygen vacancies also facilitated the catalytic efficiency of Co₃O₄/eggshell-DP.

Co ₃ O ₄对N ₂ O分解表现出优异的催化活性，迫切需要开发廉价且环保的新型高效催化剂/载体。本文中，Co ₃ O ₄纳米颗粒装饰蛋壳催化剂（Co ₃ O ₄ /eggshell-GR、Co ₃ O ₄ /eggshell-IM和Co ₃ O ₄/eggshell-DP）是通过简单的研磨、浸渍和沉积-沉淀方法制备的，其中废蛋壳被用作有效的载体和反应促进剂。结果表明，制备方法对Co ₃ O ₄ /蛋壳催化剂的催化活性影响显着；_{Co 3} O ₄ /eggshell-DP获得了最高的活性。_{Co 3} O ₄ /eggshell-DP的活性与纯Co ₃ O ₄相当。更重要的是，在400℃时其比活性约为Co ₃ O _{4的7.3倍。}检测的Co ₃ O _{4/eggshell-DP在含NO、O 2}和/或H ₂ O的气氛中也表现出优异的稳定性和抗中毒性能。还验证了Co ₃ O ₄ /eggshell-DP的优异活性与蛋壳的独特结构以及CaCO ₃和Co ₃ O ₄之间的紧密结合有关。Co ₃ O ₄ /eggshell-DP催化剂具有丰富的Co ₃ O ₄纳米粒子、更多的Co ³⁺物种和优异的氧化还原性能，促进N _2的转化O 温度较低。丰富的表面碱性位点和大量氧空位的存在也有利于Co ₃ O ₄ /eggshell-DP的催化效率。