Department of Chemistry, Xinzhou Normal University
Engineering Research Center of Ministry of Education for Fine Chemicals，Shanxi Uniersity

采用废弃的鸡蛋壳作载体，沉积沉淀法制备了一系列不同Co3O4含量Co3O4/鸡蛋壳催化剂，并在连续流动微反装置上考察了N2O分解性能。结果表明，当Co3O4质量分数为20%时，催化剂表现出优异的N2O分解性能。在空速10000 h−1和N2O含量0.1%的条件下，400 ℃可实现N2O完全转化；其比活性约为Co3O4催化剂的4.3倍（反应温度为440 ℃）；同时，该催化剂对原料气中3% O2、3.3% H2O和/或2.0×10−4 NO表现出较强的耐受性和较高的稳定性。分析催化剂的多种表征结果发现，CaCO3作为鸡蛋壳的主要成分，与活性组分Co3O4紧密结合，两者的强相互作用导致20%Co3O4/鸡蛋壳催化剂中产生更多的氧空位和Co3+；Co3O4氧化还原性能得到提高，Co−O键被有效削弱；此外，该强相互作用可提高20%Co3O4/鸡蛋壳催化剂表面碱性位点的强度，增大碱性位点数量，更易于转移电子而促进N2O分解。

A series of Co3O4/eggshell catalysts with different Co3O4 contents were prepared by the deposition-precipitation method using discarded eggshells as supports, and tested for the catalytic reaction of N2O decomposition on a fixed-bed continuous flow micro-reactor. The activity test results show that the catalyst exhibits higher activity towards N2O decomposition when the mass fraction of Co3O4 is 20%, with a specific activity of 4.3 times to that of pure Co3O4 (reaction temperature 440 ℃). At the same time, it shows strong resistance to 3% O2, 3.3% H2O and/or 2.0×10−4 NO in feed. Various characterization results indicate that the predominant composition of eggshell is CaCO3, which has a close incorporation with Co3O4. The strong interaction between CaCO3 and Co3O4 contributes to producing more oxygen vacancies and Co3+ in the 20% Co3O4/eggshell catalyst. The redox performance of Co3O4 is improved, and the Co−O bond is effectively weakened. In addition, it helps to increase the strength and amount of basic sites on the catalyst surface, making it easily transfer electrons and promote N2O decomposition.

国家自然科学基金(21673132)，山西省基础研究计划（202303021212298），山西省高等学校科技创新项目（2021L458）和忻州师范学院院级项目（2021KY03）资助

胡晓波, 冯林雁, 武瑞芳, 王永钊, 赵永祥. 鸡蛋壳负载Co3O4催化剂制备及其N2O分解性能研究[J]. 燃料化学学报（中英文）, 2024, 52(5): 707-716.

HU Xiaobo, FENG Linyan, WU Ruifang, WANG Yongzhao, ZHAO Yongxiang. Preparation of eggshell supported Co3O4 catalyst and tested for N2O decomposition[J]. Journal of Fuel Chemistry and Technology, 2024, 52(5): 707-716.