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Bulletin of the Chemical Society of Ethiopia

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THE INFLUENCE OF TRANSITION METALS ON THE PERFORMANCE OF Pt Rh Pd/γ-AL2O3 THREE WAY CATALYSTS FOR PURIFICATION OF AUTOMOTIVE EXHAUST GAS

Laitao Luo*, Zhonghua Gu, Jianjun Guo

Abstract


The influences of transition metal oxides (Zr, Mn, Co, Cu, Mo) on the performance of Pt Rh Pd/γ-Al2O3 three way catalysts were studied. The characteristics of the catalysts are investigated by using XRD, TPD, TPR. Experimental results show that the addition of Zr, Mn, Co, and Cu promoters improved the activity of Pt Rh Pd/γ-Al2O3 catalyst remarkably for CO, CH and NOx conversion, respectively. The effective order of the promoters is CuO > ZrO2 > Co3O4 > MnO2. The addition of CuO improved the dispersion of the noble metal on the γ-Al2O3 support and increased the absorption of Pt Rh Pd/γ-Al2O3 catalyst for CO and O2, in addition, promoted the reduction of the noble metal.
KEY WORDS: Purification of exhaust gas, Pt Rh Pd/γ-Al2O3 catalyst, Transition metals


Bull. Chem. Soc. Ethiop. 2006, 20(1), 113-120.



http://dx.doi.org/10.4314/bcse.v20i1.21150
AJOL African Journals Online