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采用尿素水解法和共沉淀法制备了MgAl类水滑石,高温焙烧获得衍生复合氧化物.采用X射线衍射(XRD)、热重分析(TG-DTG)、扫描电镜(SEM)、N2-吸附/脱附和CO2程序升温脱附(CO2-TPD)等手段对所制备的复合氧化物结构特征进行表征,并研究其对SO2脱除性能的差异.结果表明,共沉淀法制备的MgAlO复合氧化物比尿素法具有更大的比表面积(148.1m2·g-1)和更多碱性位,这些特点可能促使该方法制备的复合氧化物具有更高的SO2储存容量和反应速率.采用尿素法和共沉淀法制备的MgAl水滑石复合氧化物在700℃温度下SO2吸附容量分别可达0.55g·g-1和0.79 g·g-1.
MgAl hydrotalcite was prepared by urea hydrolysis and coprecipitation method, and derivatized composite oxide was obtained by calcination at high temperature.X-ray diffraction (XRD), thermogravimetry (TG-DTG), scanning electron microscopy (SEM) Desorption and CO2 temperature-programmed desorption (CO2-TPD) were used to characterize the structural characteristics of the prepared composite oxides and to study their differences in SO2 removal performance. The results show that the coprecipitation prepared MgAlO composite oxide ratio The urea method has a larger specific surface area (148.1m2 · g-1) and more alkaline sites, these characteristics may promote the composite oxide prepared by this method has a higher SO2 storage capacity and reaction rate.Urea method and the total The adsorption capacity of SO2 for MgAl hydrotalcite composite oxide prepared by precipitation method reached 0.55 g · g-1 and 0.79 g · g-1, respectively at 700 ℃.