摘要
用ZrOCl2制备出具有单一形态的无定型、单斜和四方三种形态二氧化锆,采用SEM观察其表面形貌,FT-IR检测表面羟基形式,并通过NH3(CO2)-TPD和Py-FT-IR对其表面酸碱性进行研究.结果表明,不同形态二氧化锆的表面羟基种类具有较大差异:无定型二氧化锆表面存在氢键羟基,四方二氧化锆表面独有桥式羟基,而单斜二氧化锆表面具有两种类型的锥桥式羟基.同时不同形态二氧化锆表面酸碱性也具有较大差别.
Amorphous, monoclinic and tetragonal zirconia with pure crystal phase were prepared from the same zirconium precursor, and then characterized by XRD, SEM, NH3-TPD, CO2-TPD and FT-IR techniques to determine and compare the different surface chemical properties of the three zirconia polymorphs. The results showed that different surface hydroxyl groups presented on the three zirconia polymorphs. Bibridged hydroxyl only existed on tetragonal zirconia and amorphous showed obvious H-bond hydroxyl while two type of tribridged hydroxyl existed on monoclinic zirconia surface. Meanwhile the acidity-basicity properties were different on the three zirconia polymorphs.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2004年第10期1221-1225,共5页
Acta Physico-Chimica Sinica
基金
国家基础研究重大项目计划(G1999022400)
中国科学院知识创新工程(KGCX2-302)资助项目~~