摘要
为了解氧化铌的表面化学，发展了不同种金属单晶底物定向生长氧化物薄膜技术以克服电子能谱研究氧化铌表面的实验困难．在超高真空系统中用ＨＲＥＥＬＳ，ＵＰＳ研究了ＣＨ３ＯＨ和Ｃ２Ｈ４在氧化铌模型表面的吸附．结果表明，ＣＨ３ＯＨ和Ｃ２Ｈ４在有序表面和缺陷表面的吸附行为表现出很大的不同，氧空穴对吸附有重要影响．
Metal oxides are useful catalytic materials but are not well understood because of scarcity of fundamental studies, They are rarely available as single crystals and their insulator nature causes charging problems when electrons or ions are used as probes.We report the use of a technique to overcome these problems by an epitaxial growth onto a dissimilar metal to study the surface chemistry of niobium oxide. Adsorptive behavior with the adsorbed species of CH3OH and C2H4 was characterized by UPS and HREELS in UHV.The results show that their adsorption modes on ordered Nb2O5 are very different from that on defect Nb2O5 with oxygen vacancies.This suggests that oxygen vacancies play an important role in adsorption.
出处
《分子催化》
EI
CAS
CSCD
1994年第5期338-346,共9页
Journal of Molecular Catalysis(China)
关键词
氧化铌
催化剂
甲醇
吸附
乙烯
氧空穴
Epitaxial growth,Model surface of Nb2O5, CH3OH adsorption,C2H4 adsorption,Oxygen vacancies.
