氧化铝薄膜表面羰基钼物种的可逆再生  

Reversible Regeneration of Molybdenum Carbonyl Specieson an Alumina Thin Film

作　　者：姜志全[1] 赵红[1] 谭大力[1] 翟润生[1] 包信和[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室

出　　处：《催化学报》2005年第5期423-427,共5页

基　　金：国家自然科学基金资助项目 ( 90 2 0 60 3 6)

摘　　要：通过Mo(CO) 6的热分解制备了Al2 O3 薄膜负载的金属钼模型催化剂,并采用热脱附谱(TDS)和X射线光电子能谱(XPS)原位研究了CO在金属态Mo/Al2 O3 模型催化剂表面的化学吸附.结果表明,在低温下CO可与Al2 O3 表面的金属钼纳米粒子发生多重配位形成类似于羰基钼的物种.CO在Mo/Al2 O3 模型催化剂表面的吸附导致Mo 3dXPS峰向高结合能方向位移,所生成的羰基钼物种表现为TDS谱中在2 4 0K处有脱附峰.负载的金属钼模型表面与体相金属钼的化学性质完全不同。The thin alumina film-supported metallic molybdenum model catalyst was prepared by thermal decomposition of MO(CO)6, and CO chemisorption on the catalyst was investigated in-situ by thermal desorption spectroscopy (TDS) and X-ray photoelectron spectroscopy (XPS). The results showed that a molybdenum-carbonyl-like species was formed on the alumina surface at low temperature by high coordination of CO with the surface metallic molybdenum nanoparticles, indicating a reversible regeneration of molybdenum carbonyl on the alumina surface. CO chemisorption on the model catalyst surface caused the Mo 3d XPS peak to shift toward higher binding energy. The formed molybdenum carbonyl species appeared at about 240 K in the TDS. The supported metallic molybdenum nanoparticles were quite different from the bulk molybdenum in chemical properties, which indicated a prominent particle-size effect of the clusters.

关 键 词：热脱附谱 X射线光电子能谱 羰基钼 氧化铝薄膜 可逆再生 

分 类 号：O643.3[理学—物理化学]