高稳定性介孔MgO-ZrO_2固体碱的制备及其高温CO_2吸附性能

Preparation of high stability MgO-ZrO_2 solid base and its high temperature CO_2 capture properties

以无机盐Zr(NO3)4与Mg(NO3)2为原料,聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段型聚醚(P123)作模板剂,合成了纳米介孔MgO-ZrO2复合材料,并通过XRD、N2吸附-脱附、CO2-TPD、TG等方法对材料进行了表征。结果表明,合成的MgO-ZrO2具有介孔结构,比表面积较大;且材料在反复CO2吸附-脱附应用过程中,能够完全再生。此外,材料具有典型的固溶体结构,Mg2+进入四方相ZrO2晶格中并取代Zr4+,形成了一种特殊碱性位。这种碱性位与基体结合牢固,不易流失。考察了MgO-ZrO2材料在150℃高温下的CO2吸附性能,发现材料具有较高的吸附速率(0.084 mmol/(g.min))和吸附量(1.01 mmol/g),是一种可循环利用的吸附材料。

MgO-ZrO2 had been synthesized from cheap materials Zr（NO3）4 and Mg（NO3）2 using poly（ethylene oxide）-poly（propylene oxide）-poly（ethylene oxide）（P123） as template.The structure and surface properties of the as-prepared materials were characterized by XRD,N2 adsorption/desorption and CO2-TPD techniques.The results demonstrated that material contain typical mesoporous characteristics and can be recycled without considerable decrease of CO2 adsorption capacity.The material can be recycled in multicycle CO2 adsorption/desorption application.The material has a typical solid solution structure,special basic site form with Mg2＋ entering into the lattice of tetragonal ZrO2 and replacing Zr4＋.The basic site with a solid substrate is not easy to lose.The ability of working at CO2 temperature as high as 150 ℃,with the high adsorption velocity（0.084 mmol/（g·min））and capacity（1.01 mmol/g）makes MgO-ZrO2 solid base to be a very promising CO2 acceptor for effective applications.