柠檬酸配合法制备CuMnCeOx催化剂及常温催化氧化性能研究

摘要：常温催化氧化是消除室内HCHO污染最可行的方法之一，其中以过渡金属氧化物为代表的催化剂因性能优异、成本低廉而备受广泛关注。采用柠檬酸络合法和水热法制备了一系列CuMnCeOx催化剂，研究考察制备方法及载体对催化剂氧化性能的影响，并利用XRD、SEM、BET、H2-TPR、XPS和IR等对催化剂进行微观表征与分析。研究发现，制备方法及载体类型对催化剂的表面结构形貌、氧化性能产生显著影响，其中采用柠檬酸络合法所制的CuMnCeOx-C催化剂性能最佳，48h的HCHO去除率达98.6%，完全满足GB50325-2001标准要求，其介孔结构，晶体粒径及所形成的铈基铜锰固溶体均利于形成大量氧空位及催化氧化反应，且展示出良好的抗水蒸气和稳定性能，其在常温催化氧化VOCs方面具有重要应用前景。

Preparation of CuMnCeOx Catalysts by Complex Method with Citric Acid and Catalytic Oxidation at Ambient Temperature

Abstract: Catalytic oxidation of formaldehyde (HCHO) at ambient temperature is one of the most feasible ways to eliminate indoor HCHO pollution. Among them, transition metal oxides have attracted extensive attention owing to their excellent performance and low cost. A series of CuMnCeOx catalysts were synthesized by complex method with citric acid and hydrothermal method. The influences of preparation methods and supports on the performance of these catalysts were investigated. These samples were also characterized by XRD, SEM, BET, H2-TPR, XPS and IR techniques to explain the improved activity. The results demonstrated that the preparation methods and supports had a significant impact on the surface structure, morphology, oxidation performance of these catalysts. Among them, CuMnCeOx-C was synthesized by complexation exhibited the highest activity and stability, and the HCHO removal rate reached 98.6%, fully meeting the requirements of GB50325-2001, which were beneficial to the formation of large number of oxygen vacancies due to mesoporous structure, crystal particle size and the ceria-based Cu-Mn solid solution. Moreover, the catalyst exhibited a good resistance to water vapor and stability. It also provides a promising application prospect in catalytic oxidation of VOCs.