| With the continuous improvement of people’s living standards,people’s consumption concept is gradually changing and house-purchasebecomes a consumption hot spots. Meanwhile, people increasingly payattention to interior finish. However, indoor air environment is becomingdeterioration for the use of synthetic building materials and people’s healthand productivity has being seriously effected. Formaldehyde is one of themost common and concerning indoor gaseous pollutants.In this paper, a series of Co-MnOx/ZSM-5and Ni-MnOx/ZSM-5catalysts were synthesized and coated on cordierite honeycomb ceramicsby impregnation method. The catalysts were characterized by means ofXRD, BET, TEM, TG-DSC and XPS. Their activities in catalyticoxidation of low concentration formaldehyde with the assist of ozone wereevaluated in a seal measurement chamber and wind tunnel test platform.Moreover, the effect of catalyst preparation was discussed. The resultsshow:1. Formaldehyde was degraded efficiently by catalysts with the assistof ozone whereas the degradation efficiency was determined by calcinationtemperature and the loading of bimetallic composite oxides. In presentresearch, the10%Co-MnOx/ZSM-5or10%Ni-MnOx/ZSM-5samplecalcined at500oC showed the best catalytic performance. The formation ofCoMnO3or NiMnO3, appropriate specific surface area and the coexistenceof Mn4+/Mn3+was a possible determinant for formaldehyde removal. 2. The catalytic activity of Ni-MnOx/ZSM-5is better thenCo-MnOx/ZSM-5. In3m3seal measurement chamber, the former can got aformaldehyde degradation efficiency of93.95%in two hours. Meanwhile,the degradation efficiency is gradually decreased with the rise of initialformaldehyde concentration. In wind tunnel test platform, the efficiency is25%.3. Simultaneously used electrostatic precipitator and catalyst, with thePM0.3was cleaned, the catalytic reaction was driven by ozone whichreleased by the electrostatic precipitator. So the indoor air wascomprehensively purified. |
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