Catalytic oxidation of HCHO over Mn-based metal oxide catalysts at room temperature
HUANG Qiong1,2,3, BAI Meng-tian2, REN Chao2, WANG Guang-hong2, TAO Tao1,2,3, ZHAO Yun-xia1,2,3, CHEN Min-dong1,2,3
1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; 3. Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, Nanjing University of Information Science & Technology, Nanjing 210044, China
Abstract：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.
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