鸟巢状氧化镁球形材料的合成、表征及催化性能  

Synthesis,Characterization,and Catalytic Performance of Nest-Like Magnesia Spheres

作　　者：张世刚[1,2,3] 许磊[1,2] 刘红超[1,2] 孟霜鹤[1,2] 杨越[1,2] 陈吉平[4] 刘中民[1,2] 

机构地区：[1]中国科学院大连化学物理研究所甲醇制烯烃国家工程中心,辽宁大连116023 [2]中国科学院大连化学物理研究所清洁能源国家实验室,辽宁大连116023 [3]中国科学院研究生院,北京100049 [4]中国科学院大连化学物理研究所生态环境评价与分析测试中心,辽宁大连116023

出　　处：《催化学报》2009年第6期514-518,共5页

摘　　要：将硝酸镁和碳酸钾溶液在沸腾的条件下反应,制备了一种具有鸟巢状形貌的碱式碳酸镁球形材料.此结构是由片状材料在无模板剂的条件下通过自组装形成,而且在焙烧过程中,形貌可以保持不变,从而制备得到新颖的具有鸟巢状形貌的多孔氧化镁球形材料.采用X射线衍射、低温氮气吸附、红外、热重和扫描电镜等分析手段对制备的材料进行了表征.结果表明,鸟巢状氧化镁具有较大的比表面积(150m2/g)和孔容(0.51cm3/g).该材料用于1,2-丙二醇转化反应时,丙酮醇的选择性为92.36%,显示了良好的催化活性.Nest-like alkaline magnesium carbonate spheres were successfully prepared by precipitation of boiling Mg（NO3）2 solution by adding hot K2CO3 solution. Thin alkaline magnesium carbonate nanoplates, which can convert to nest-like magnesium oxide （MgO） without changes of morphology by calcination, are self-assembled to nest-like spheres with a cave in the center of each particle. The obtained materials were characterized by nitrogen adsorption-desorption, X-ray diffraction, scanning electron microscopy, infrared spectroscopy, and ther-mogravimetry. The results showed that 150 m^2/g of surface area and 0.51 cm^3/g of pore volume were obtained for the nest-like MgO. Moreover, 92.36% selectivity for acetol was achieved in the conversion of 1,2-propylene glycol over the MgO with nest-like structure.

关 键 词：多孔 鸟巢状 氧化镁 自组装 丙二醇 丙酮醇 

分 类 号：O643.32[理学—物理化学]