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立方Nd2O3上过氧物种光诱导生成的18O同位素示踪考察
引用本文:景孝廉,佘雯瑜,翁维正,李建梅,夏文生,万惠霖.立方Nd2O3上过氧物种光诱导生成的18O同位素示踪考察[J].催化学报,2014,35(8):1385-1393.
作者姓名:景孝廉  佘雯瑜  翁维正  李建梅  夏文生  万惠霖
作者单位:厦门大学化学化工学院化学系, 固体表面物理化学国家重点实验室, 醇醚酯化工清洁生产国家工程实验室, 福建厦门 361005
基金项目:supported by the National Basic Research Program of China (973 Program, 2010CB732303);the National Natural Science Foundation of China (21173173, 21033006, 21373169);the Program for Changjiang Scholars and Innovative Research Team in University (IRT1036)~~
摘    要:采用原位显微Raman光谱和18O同位素示踪技术,以325 nm激光为激发光源,对立方Nd2O3上过氧物种的光诱导生成过程进行了详细表征,进一步证实过氧源于分子氧对晶格氧的氧化反应. 结果还表明,325 nm激光在室温下即可诱导过氧的生成,在实验条件下,生成的过氧物种可与Nd2O3的晶格氧发生快速的氧交换反应,位于Nd2O3体相的晶格氧也可迁移至样品表层进而参与过氧的生成. 325 nm激光照射有助于促进晶格氧的迁移以及晶格氧与分子氧之间的氧交换反应.

关 键 词:分子氧活化  过氧  倍半氧化钕  光诱导反应  18O同位素研究  Raman光谱
收稿时间:2014-03-28

18O isotopic study of photo-induced formation of peroxide species on cubic Nd2O3
Xiaolian Jing,Wenyu She,Weizheng Weng,Jianmei Li,Wensheng Xia,Huilin Wan.18O isotopic study of photo-induced formation of peroxide species on cubic Nd2O3[J].Chinese Journal of Catalysis,2014,35(8):1385-1393.
Authors:Xiaolian Jing  Wenyu She  Weizheng Weng  Jianmei Li  Wensheng Xia  Huilin Wan
Institution:State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
Abstract:Photo-induced formation of peroxide species on cubic Nd2O3 was studied by in situ microprobe Raman spectroscopy using 18O as a tracer and a 325-nm laser as an excitation source. The results confirmed that the peroxide ions were formed through photooxidation of the lattice oxygen species in neodymium sesquioxide by molecular oxygen species. Under UV excitation (λ = 325 nm), the reaction between O2 and O2- could take place at room temperature. A fast oxygen exchange between the peroxide ions and the lattice oxygen species in Nd2O3 took place under the experimental conditions studied. Also, bulk lattice oxygen species in Nd2O3 could migrate to the surface layer and participate in the formation of peroxide ions. The migration of lattice oxygen species and the oxygen exchange between lattice oxygen and peroxide ions were promoted by UV laser irradiation.
Keywords:Oxygen activation  Peroxide  Neodymium sesquioxide  Photo-induced reaction  18O isotopic study  Raman spectroscopy
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