Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (09): 997-1000.doi: 10.3866/PKU.WHXB20050911

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Characterization of CuO Species in CuO/CeO2-Al2O3 Catalysts by In-situ XRD, Raman Spectroscopy and TPR

HE Mai; FANG Ping; XIE Guan-qun; XIE Yun-long; YAN Zong-lan; LUO Meng-fei   

  1. Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004
  • Received:2005-01-25 Revised:2005-03-16 Published:2005-09-15
  • Contact: LUO Meng-fei

Abstract: CuO species and thermal solid-solid interaction in CuO(w,%)/ CeO2-Al2O3 catalysts prepared by an impregnation method are characterized by in-situ XRD, Raman spectroscopy and H2-TPR techniques. Experiment results show that CuO presents as highly dispersed and bulk CuO on the surface of CuO(33.3%)/CeO2-Al2O3 calcined at 300 ℃. At high temperatures CuO can be transferred from the surface into the internal layer of CeO2 and the transference of CuO increases with increasing the calcination temperature. Some of CuO that exists in the internal layer of CeO2 presents as bulk CuO, some of that interacts with the support Al2O3 to produce CuAl2O4. The calcination temperature also promotes the CuO-Al2O3 interaction. It shows that the existence of different CuO species can be effectively confirmed by in-situ XRD, Raman spectroscopy and H2-TPR techniques.

Key words: CuO/CeO2-Al2O3, XRD, Raman, TPR, Transference of CuO, Solid-solid interaction