【作者】 黄传敬； 金燕仙； 伊晓东； 翁维正； 万惠霖；

【Author】 HUANG Chuan-jing,JIN Yan-xian,YI Xiao-dong,WENG Wei-zheng,WAN Hui-lin~* State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry,Xiamen University,Xiamen 361005, China

【机构】 厦门大学化学系,固体表面物理化学国家重点实验室；

【摘要】 采用激光拉曼光谱技术,研究了VTeO/SiO₂催化剂的结构及组分之间的相互作用。可见激光拉曼光谱与紫外激光拉曼光谱给出不同的结构信息。结合样品的紫外-可见漫反射光谱,对拉曼实验结果进行了讨论。更多还原

【Abstract】 A series of VTeO/SiO₂ catalysts are characterized by visible Raman spectroscopy,UV Raman spectroscopy,and UV-Vis diffuse reflectance spectroscopy.Visible Raman spectra show that the coordination of Te changes from TeO₄ to TeO₃ with increasing Te content,and V oxide from small cluster vanadate to surface polyvanadate including V—O—V and V—O—Te species.By UV Raman spectroscopy only the small cluster vanadate is detected,except for V—O—Te species appearing on the sample with higher Te content.UV-Vis diffuse reflectance spectra indicate strong electronic absorption of VTeO/SiO₂ catalysts in the UV region,which would make UV Raman spectroscopy more sensitive at the surface region than visible Raman spectroscopy.It is then assumed that the UV Raman spectra and visible Raman spectra probably reveal the surface structure and bulk or sub-surface structure of the loaded oxides on the catalysts,respectively.更多还原