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8


Teoret. i eksperim. khimiya. 2006. Vol.42 No. 1. p. 44-48

Effect of Rare-Earth Element Oxides (CeО2, La2О3) on Properties
of Pd/Al2O3 Catalysts of Nitrogen Oxides Reduction by Methane

 

O. V. Mokhnachuk, S. O. Soloviev, A. I. Senkevych*


L. V. Pysarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine
Prosp. Nauky 31, 03028 Kyiv, Ukraine. E-mail: olegmvpost@ukr.net

* G. V. Kurdiumov Institute of Metallophysics, National Academy of Sciences of Ukraine
Bulvar Akademika Vernadskogo 36, 03068 Kyiv, Ukraine. E-mail: senk@imp.kiev.ua


It was shown that thermostability of supported Pd/Al2O3 catalysts increases as a result of modifying with rare-earth element oxides (La2O3 and Ce2O3). An effect of thermal activation of alumo-palladium catalyst modified with lanthanum oxide was found. This effect consisted in increase of specific catalytic activity in high temperature reduction of nitrogen oxides by methane after heat treatment of the catalyst at 850 oC. X-ray photoelectron spectroscopy data have showed that the effect of thermal activation is conditioned by stabilization of palladium in the state of Pd1+.


Key word reduction of NO, palladium, aluminium oxides, rare-earth element oxides, modification.