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Citation: Yang Cheng, Dong Qing-Nian, Zhang Jing, Ren Jie, Sun Yu-Han, Xie Ya-Ning, Hu Tian-Dou. The Structural Effect of CeO2 and La2O3 Modified Pd/γ-Al2O3 Catalysts[J]. Acta Physico-Chimica Sinica, ;2002, 18(02): 170-174. doi: 10.3866/PKU.WHXB20020216 shu

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

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 Date: 25 June 2001
Available Online: 15 February 2002

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.
- La₂O₃;CeO₂;Supported Pd;Structure effect;Methanol decomposition
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