Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (02): 170-174.doi: 10.3866/PKU.WHXB20020216

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The Structural Effect of CeO2 and La2O3 Modified Pd/γ-Al2O3 Catalysts

Yang Cheng;Dong Qing-Nian;Zhang Jing;Ren Jie;Sun Yu-Han;Xie Ya-Ning;Hu Tian-Dou   

  1. The State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001;The State Key Laboratory of Synchrotron Radiation,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039
  • Received:2001-06-25 Revised:2001-10-09 Published:2002-02-15
  • Contact: Sun Yu-Han

Abstract: A series of Pd/γ-Al2O3 catalysts modified by CeO2 and La2O3 were prepared by impregnation method with different La2O3,CeO2 dope manners.Methanol decomposition was used as a probe reaction.The structure of the catalysts was characterized by means of BET,XRD,XPS and FTIR.The results showed that a La2O3 -CeO2 solid solution was facile to form by La3+ dissolution into CeO2 lattice.The dimension of CeO2 particles decreased,while the dispersion and crystal plane of Pd and the Pd-CeO2 interaction varied with La2O3,CeO2 dope manners.High dispersion of Pd and a strong interaction between Pd and CeO2 were observed on a La2O3 and CeO2 modified Pd/Al2O3 catalyst with La2O3-CeO2 successive dope manner,which resulted in high activity for methanol decomposition.

Key words: La2O3, CeO2, Supported Pd, Structure effect, Methanol decomposition