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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

S.Afr.j.chem. (Online) vol.62  Durban  2009




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



Hua ZhongI, II; Hongliang XieI, 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




LaSrCo0.9Pd0.1O4 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 LaSrCo0.9Pd0.1O4 (reduced and oxidized) and weak signals of lanthanum oxide for LaSrCo0.9Pd0.1O4 (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 LaSrCo0.9Pd0.1O4 (reduced and oxidized) > LaSrCo0.9Pd0.1O4 (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



Full text available only in PDF format.



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



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