Mn基金属氧化物催化剂常温催化氧化甲醛

以硝酸铈和高锰酸钾为原料，采用络合法制备了一系列Mn-Ce-O混合氧化物催化剂，并通过正交实验设计方案，考察了Mn/Ce摩尔比、水化热温度、焙烧温度及焙烧时间对Mn-Ce-O混合氧化物催化剂常温催化氧化甲醛性能的影响，并采用X射线衍射仪（XRD）、扫描电镜（SEM）、透射电镜（TEM）和红外光谱（IR）等技术对催化剂进行微观表征与分析.结果表明：当Mn/Ce摩尔比1：1，水化热温度为180℃，焙烧温度为350℃时，催化剂表现出最佳的常温氧化活性，36h甲醛降解率可达94.2%，且稳定性良好.催化剂氧化活性的高低与材料比表面积并非正相关，而与材料结构形态存在密切关联，而材料结构主要取决于水化热温度，其次是Mn/Ce摩尔比.

Catalytic oxidation of HCHO over Mn-based metal oxide catalysts at room temperature

A series of Mn-Ce-O mixed oxide catalysts were prepared by thehydrothermal method with using of Mn(NO₃)₂ and KMnO₄. The orthogonal experiment was designed to get the best of technological parameter. The effect of the molar ratio of Mn/Ce, hydrothermal reaction temperature, calcinations temperature and time on the catalytic properties for the catalytic oxidation of formaldehyde were investigated. These catalysts were characterized by XRD, SEM, TEM and IR techniques. The results showed that the Mn-Ce-O mixed oxide catalysts with Mn/Ce molar ratio of 1, hydrothermal reaction temperature setting as 180℃, calcining with 350℃ exhibited the highest activity and well stability with room temperature, the conversion of formaldehyde was 94.2% with 36h. The activities of these catalysts were not positively related to the specific surface areas, but were closely related to the structural morphology. However, the structure of these catalysts depended mainly on the hydrothermal reaction temperature, and then followed by the Mn/Ce molar ratio.