Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (8): 1385-1393.DOI: 10.1016/S1872-2067(14)60153-4

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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   

  1. 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
  • Received:2014-03-28 Revised:2014-05-14 Online:2014-08-01 Published:2014-08-05
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 Program, 2010CB732303), the National Natural Science Foundation of China (21173173, 21033006, 21373169), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT1036).

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.

Key words: Oxygen activation, Peroxide, Neodymium sesquioxide, Photo-induced reaction, 18O isotopic study, Raman spectroscopy