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以羧甲基纤维素钠(CMC)为黏结剂制备了具有高比表面积和较好机械强度的柱状MgO颗粒吸附剂。研究了煅烧温度、CMC质量分数对成型MgO颗粒的孔结构分形特性,CO_2吸附量回收率以及机械强度的影响。结果表明,煅烧温度为500℃、CMC添加量为20%的MgO颗粒具有较高的比表面积,其在50℃,常压下的CO_2吸附量回收率和机械强度分别达到78.66%和0.39 MPa。FHH分形模型可以很好地定量分析成型颗粒的孔道结构特征,分形维数越小,颗粒孔道结构越规则有序,吸附剂的吸附效率越高。MgO颗粒的分形维数与其平均孔径和比表面积分别呈现一定的负相关和正相关关系,而与孔体积没有直接关系。5次循环后MgO颗粒的吸附量仅减少了3.6%,因此该MgO颗粒适合用于CO_2气体的捕集。
A columnar MgO particle adsorbent with high specific surface area and good mechanical strength was prepared by using sodium carboxymethylcellulose (CMC) as binder. The effect of calcination temperature and mass fraction of CMC on the fractal properties of pore structure, the recovery of CO 2 adsorption capacity and the mechanical strength of the formed MgO particles were investigated. The results show that the calcination temperature is 500 ℃ and the content of CMC is 20%, the specific surface area of MgO particles is high. The recovery of CO 2 and the mechanical strength of the particles are 78.66% and 0.39 MPa respectively at 50 ℃ and atmospheric pressure. FHH fractal model can quantitatively analyze the pore structure characteristics of shaped particles. The smaller the fractal dimension is, the more orderly the pore structure of the particles and the higher the adsorption efficiency of the adsorbent. The fractal dimension of MgO particles shows a negative correlation and a positive correlation with the average pore diameter and the specific surface area, respectively, but has no direct relationship with the pore volume. After 5 cycles, the adsorption amount of MgO particles decreased by only 3.6%, so that the MgO particles are suitable for capturing CO 2 gas.