同步辐射X射线近边吸收谱法研究———二元金属重整催化剂中铂和铼的化学态

Study of Synchrotron Radiation X Ray Absorption Near Edge Spectrometry——Chemical Valent State of Pt and Re in Pt,Re/Al 2O 3 Reformed Catalyst

北京同步辐射装置（ＢＳＲＦ）提供同步辐射（ＳＲ）可调单色光，用Ｘ射线近边吸收谱法测得Ｆｅ３＋～Ｆｅ０和Ｎｉ３＋～Ｎｉ０的Ｋα吸收边能量位移分别为１０ｅＶ；Ｐｔ（Ⅳ）～Ｐｔ０的ＬⅢ吸收边能量位移为２ｅＶ；Ｒｅ（Ⅳ）～Ｒｅ０和Ｒｅ（Ⅶ）～Ｒｅ０的ＬⅢ吸收边能量位移分别为３ｅＶ和４ｅＶ，其化学位移测量的标准偏差为±０５１ｅＶ（２σ）。

The application of synchrotron radiation X ray absorption near edge spectrometry to chemical valent state of Pt and Re in Pt, Re/Al 2O 3 is reported in this paper. The X ray absorption spectra near Fe K α , Ni K α , Pt L Ⅲ and Re L Ⅲ edges are obtained on the 4W1B beamline from a wiggler sources at Beijing Electron Positron Collider(BEPC) National Lab. A double crystal Si(111) monochromator with energy resolution of ΔE/E =10 -4 is used. The results show that energy shifts are as follow: 10 eV for K α edges of Fe 3+ Fe 0 and Ni 3+ Ni 0, 2 eV for L Ⅲ edges of Pt(Ⅳ) Pt 0, 3 eV and 4 eV for L Ⅲ edges of Re(Ⅳ) Re 0 and Re(Ⅶ) Re 0 respectively. Standard deviation of the measurement for chemical shift is about 0.51 eV(2 σ ).