Preparation of high stability MgO-ZrO2 solid base and its high temperature CO2 capture properties
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摘要: 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、CO2TPD、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(0.084mmol/(g·min))和吸附量（1.01mmol/g），是一种可循环利用的吸附材料。Abstract: 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.
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Key words:
- high temperature CO2 capture /
- high stability /
- MgO-ZrO2 /
- solid base
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