RESEARCH ARTICLE

 

The influence of palladium on the structure and catalytic activity of lanthanum based mixed oxide

 

 

Hua Zhong^{I, II}; Hongliang Xie^{I, II}

^IProvincial Key Laboratory of Coordination Chemistry, Jinggangshan University, Jian, 343009, People's Republic of China
^IICollege of Chemistry and Chemical Engineering, Jinggangshan University, Jian, 343009, People's Republic of China

 

 

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ABSTRACT

LaSrCo_0.9Pd_0.1O₄ and LaSrCoO₄ mixed oxides were prepared and characterized by XRD, FTIR, BET and XPS, then studied for the reduction of NO by CO. The results show that all samples display characteristic peaks of crystal structure A₂BO₄ and show the rather strong diffraction pattern for LaSrCo_0.9Pd_0.1O₄ (reduced and oxidized) and weak signals of lanthanum oxide for LaSrCo_0.9Pd_0.1O₄ (reduced). The noble metal Pd has a significant influence on the specific surface areas, pore volumes, binding energies and activities of the samples. For NO reduction by CO, catalytic activity shows complete conversion below 360 °C and the order of activity is LaSrCo_0.9Pd_0.1O₄ (reduced and oxidized) > LaSrCo_0.9Pd_0.1O₄ (reduced) > LaSrCoO₄ (reduced). Kinetic analysis for NO reduction by CO indicates that the specific reaction rate is significantly affected by the synthesis procedure.

Keywords: Noble metal Pd, NO reduction by CO, XPS

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Acknowledgements

The work described above was supported by Jinggangshan University and by the Education Bureau of Jiangxi, China (Project No. GJJ09339) and the Science and Technology Program of Jinggangshan University (Grant No. JZ0730).

 

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Received 1 August 2008
Revised 20 December 2008
Accepted 10 February 2009

 

 

* To whom correspondence should be addressed. E-mail: hua_zh@163.com