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

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。

Preparation of high stability MgO-ZrO2 solid base and its high temperature CO2 capture properties

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 （0.084mmol/(g·min)）and capacity（1.01mmol/g）makes MgO-ZrO₂ solid base to be a very promising CO₂ acceptor for effective applications.