Temperature-Dependent Formation of Redox Sites in Molybdenum Trioxide Studied by Electron Paramagnetic Resonance Spectroscopy  

利用EPR研究三氧化钼中氧还活性位点形成的温度依赖性（英文）

作　　者：谭天[1,2,3] 陈明 苏吉虎[1,2,3] 杜江峰 

机构地区：[1]中国科学技术大学近代物理系,合肥微尺度物质科学国家研究中心,合肥230026 [2]中国科学技术大学,中国科学院微观磁共振重点实验室,合肥230026 [3]中国科学技术大学,量子信息与量子科技前沿协同创新中心,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2019年第6期657-660,I0002,共5页化学物理学报（英文）

基　　金：supported by the National Key R&D Program of China(No.2018YFA0306600);AnHui Initiative in Quantum Information Technologies(No.AHY050000)

摘　　要：The formation and qualification of redox sites in transition metal oxides are always the active fields related to electronics, catalysis, sensors, and energy-storage units. In the present study, the temperature dependence of thermal reduction of MoO3 was surveyed at the range of 350℃ to 750℃. Upon reduction, the formed redox species characterized by EPR spectroscopy are the MoVion and superoxide anion radical (O2-) when the reduction was induced at the optimal temperature of 300-350℃. When heating-up from 350℃, the EPR signals started to decline in amplitude. The signals in the range of 400-450℃ decreased to half of that at 350℃, and then to zero at ~600℃. Further treatment at even higher temperature or prolonged heating time at 500℃ caused more reduction and more free electrons were released to the MoO3 bulk, which results in a delocalized means similar to the antiferromagnetic coupling. These data herein are helpful to prepare and study the metal-oxide catalysts.

关 键 词：MOO3 Thermal reduction Mo~Ⅴ Superoxide anion radical Electron paramagnetic resonance spectroscopy 

分 类 号：TQ136.12[化学工程—无机化工]