摘要
对赤泥材料进行酸改性,利用XRD、N2 吸附-脱附等方法对改性赤泥材料结构进行表征,通过DFT计算结果对赤泥材料表面的吸附行为进行分析,考察了赤泥用于甲苯氧化的吸附性能及稳定性.实验结果表明,Pd负载量为0.3%(w)的改性赤泥对甲苯的吸附效果最优,饱和吸附容量为 18.4 mg/g.酸改性有效提高了赤泥的比表面积,有利于甲苯分子的吸附,负载Pd有助于提高赤泥的甲苯吸附性能,适量的Pd可增加赤泥材料的活性位点,有利于Pd在材料表面的附着和分散.随反应时间的延长,赤泥材料的甲苯催化效率基本稳定在90%左右,具有良好的稳定性.
Abstract
The red mud material was modified,and the structure of the modified red mud material was characterized by XRD and N2 adsorption-desorption.The adsorption behavior on the surface of the red mud material was analyzed according to the DFT calculations results.The toluene adsorption performance and stability of the red mud were investigated.The experimental results show that the modified red mud with a Pd loading of 0.3%(w)has the best toluene adsorption effect,and the adsorption saturation capacity is 18.4 mg/g.Acid modification effectively increases the specific surface area of the red mud and facilitates toluene molecule adsorption.The loading of Pd contributes to the improvement of the toluene adsorption performance of the red mud,and the appropriate amount of Pd increases the active sites of the red mud material,promoting the attachment and dispersion of Pd on the material surface.With the prolongation of reaction time,the toluene catalytic efficiency of the red mud material is basically stable at about 90%with good stability.
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