高稳定性介孔MgO-ZrO2纳米复合物对CO2吸附性能研究  

CO_2 Adsorption over Mesoporous MgO-ZrO_2 Nanocomposites with High Stability

作　　者：付新[1,2] 刘水刚[1,2] 李军平[1] 赵宁[1] 肖福魁[1] 魏伟[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100039

出　　处：《精细化工》2008年第11期1092-1096,共5页Fine Chemicals

基　　金：中国科学院知识创新工程青年人才领域前沿项目资助(2007YQNRC07)~~

摘　　要：用溶胶-凝胶法制备了介孔MgO-ZrO2纳米复合物,并通过XRD、氮吸附和CO2-TPD等手段表征了材料的结构特征和表面性质。XRD、氮吸附结果表明此纳米复合物具有典型的介孔结构,比表面积达183-212 m^2/g,并且有较好的热稳定性,在700℃以下介孔孔道不会坍塌。另一方面,这种纳米复合物表面具有适中的碱性,其碱性位与基体结合牢固,稳定性好。由于其具有发达的孔隙和适中的碱性,二氧化碳在其表面的吸附量达1.6 mmol/g,且经数次循环后材料的吸附性能无明显下降。A novel CO2 absorbent MgO-ZrO2 nanocomposites were synthesized via appropriate sol-gel process. The structure and surface properties of the as-prepared materials were characterized by XRD, N2 adsorption-desorption and CO2-TPD techniques. XRD and N2 adsorption-desorption results showed that the nanoeomposites possessed mesoporous framework and a surface area of 183 - 212 m^2/g, and their mesoporous framework was well preserved even after calcinations at 700 ℃. In addition, the nanocomposites exhibited appropriate basic strength and the basic sites were tightly anchored to the substrate, greatly improving the stability of the surface basicity. Owing to the advantages of the mesoporous structure and the surface basicity, the amount of CO2 adsorption over MgO-ZrO2 nanocomposites was up to 1.6 mmol/g and this material after multicycle runs of CO2 adsorption/ desorption kept almost the performance of the fresh samples.

关 键 词：CO2吸附 高稳定性 介孔 MGO-ZRO2 纳米复合物 催化与分离提纯技术 

分 类 号：TQ424[化学工程]