Abstract
The surface structure analysis of a model catalyst MoO x /TiO 2(110) was for the first time performed by polarization-dependent total-reflection fluorescence X-ray absorption fine structure (PTRF-XAFS) in three different directions of the crystal surface. Two samples of MoO x /TiO 2(110) were prepared by an impregnation of (NH 4) 6Mo 7O 24·4H 2O using ultra high purity water and normal distilled water. The PTRF-XAFS analysis revealed that anisotropic Mo dimer species was preferentially formed on the TiO 2(110) surface, with Mo–Mo bond (0.335 nm) parallel to the [1 1 ̄ 0] direction when the ultra high purity water was used as the solvent. On the other hand, the Mo oxide on the surface prepared using normal distilled water had a symmetric tetrahedral structure (MoO 4) with Mo–O of 0.176 nm, which was due to the coexistence of alkaline metals at the surface.
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