【摘要】 本文采用等体积浸渍法将活性组分Co₃O₄负载到具有大比表面积、独特三维交联介孔道的KIT-6分子筛上，制备一种负载型的Co₃O₄/KIT-6催化剂，并用于催化分解N₂O反应.研究发现，负载Co₃O₄后的催化剂不仅保持了KIT-6有序的介孔结构，同时增大了催化剂的有效比表面积，提高了活性组分Co₃O₄的利用率，其催化活性基本与纯Co₃O₄相持平.通过对不同负载量的Co/KIT-6催化剂的活性测试发现，该催化剂的活性随着Co负载量的增加而提升.通过对30%Co/KIT-6催化剂的稳定性测试及其在杂质气体存在条件下的活性测试，表明30%Co/KIT-6催化剂具有较好的催化稳定性和杂质气体抗性，适用于实际工业生产尾气中的N₂O处理.更多还原

【Abstract】 Nitrous oxide is not only a greenhouse gas with a high warming potential, but also a long-lasting consumer to ozone in the stratos-phere. It seriously damages the atmospheric environment and endanger human health. However, the annual emissions of N₂O is increa-sing, so it is of great significance to eliminate N₂O and reduce its pollution to the environment. At present, direct catalytic N₂O decomposition is regarded as the most promising method in the reported method for eliminating N₂O form the industrial tail gases. In recent years, researchers have been working hard to develop N₂O decomposition catalysts with low temperature, high efficiency, good tolerance to impurity gases, strong stability and low cost. Among them, metal oxide catalysts with Co₃O₄ as active compounds have been attracted much attention because of their excellent catalytic performance. However, the small specific surface area, low utilization rate of active species and high production cost of simple metal oxide catalysts hinder the large-scale production and application of such catalysts. In this paper, the Co₃O₄ was used as active compound and impregnated on the surface of three dimensional cross linked mesoporous KIT-6 molecular sieve to prepared the supported Co₃O₄/KIT-6 catalyst for the catalytic N₂O decomposition. The prepared catalysts were characterized by X-ray diffraction（XRD）, nitrogen adsorption and desorption, transmission electron microscope（TEM）, X-ray photoelectron spectroscopy（XPS） and Fourier transform infrared spectroscopy（FTIR）, respectively. It was found that the catalyst loaded with Co₃O₄ not only maintains the ordered mesoporous structure of KIT-6, but also increases the effective specific surface area of the catalyst and improves the utilization rate of the active component Co₃O₄. In addition, XPS and FTIR results showed that the interaction between Co and KIT-6 weakened the Co—O bond, which can also improve the activity of the catalyst to some extent. Hence, the catalytic activity of x%Co/KIT-6（when x≥30） is basically the same as that of pure Co₃O₄. Through the activity test of x%Co/KIT-6 catalysts with different loadings, it is found that the activity of the catalyst increases with the increase of Co loading. Through the activity test and the stability test in the presence of 5%（volume percent） O₂ and 0.1‰ NO with 0.2‰ N₂O/Ar for the 30%Co/KIT-6 catalyst, it can be found that the 30%Co/KIT-6 catalyst has good catalytic stability and impurity gas resistance. It is suitable for treatment of N₂O in exhaust gas from actual industrial production.更多还原