WO3对MnOx/TiO2低温脱硝SCR催化剂的改性研究

以醋酸锰为前驱物通过浸渍法制备了MnO_x/TiO₂催化剂，用WO₃对载体进行改性制得一系列MnO_x-WO₃/ TiO₂催化剂，采用X射线衍射（XRD）、比表面积测定(BET)、拉曼光谱(LRS)、原位红外(FT-IR)光谱等表征技术进行相关的微观表征分析，同时在模拟氨气选择性催化还原NO_x（NH₃-SCR）的反应条件下对催化剂的脱硝反应活性进行了考察。研究表明，添加5%的WO₃拓展了载体的比表面积，提高了催化剂的抗热性，增加了催化剂表面的Brnsted酸位，拓宽其选择性催化还原脱硝活性温度窗口，对MnO_x/TiO₂催化剂有很好的改性作用；先钨后锰的负载顺序优于先锰后钨；随着温度的升高，化学催化反应速率提高，催化剂表面NH₃吸附峰呈减弱或消失趋势，故催化剂脱硝活性温度曲线呈中间高、两头低。

WO_3 modification on MnO_x/TiO_2 low-temperature De-NO_x SCR catalyst

A series of TiO2 supported manganese oxide catalysts,MnOx/TiO2,were prepared by wet-impregnation method for the low temperature selective catalytic reduction(SCR) of NO with ammonia.WO3 with different loadings was added to MnOx /TiO2 samples to investigate its possible influence on the catalytic activity of MnOx /TiO2 by using several characterization techniques including BET surface area,laser Raman spectroscopy(LRS),Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD).The research shows t...