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Teoret. i eksperim. khimiya. 2004. Vol.40 No. 5. p. 312-315

Mechanism of the Separat Interaction of Oxygen and Methane
with Perovskite Catalyst SrCoO3-x Modified by Alkaline Metals


A. I. Bostan, Yu. I. Pyatnitsky, E. V. Kondratenko*

L. V. Pysarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine
31 Prosp. Nauky, 03028 Kyiv, Ukraine. E-mail: yupyat@fm.com.ua

*Institute for Applied Chemistry Berlin-Adlershof
12 Richard-Willstaetter Str., 12489 Berlin, Germany. E-mail: evgenii@aca-berlin.de

Primary stages of O2 and CH4 activation on perovskite strontium cobaltite modified by alkaline metals was studied in non-stationary conditions using TAP reactor (Temporal Analysis of Products). It was es- tablished that adsorption of oxygen can be described by three-stage mechanism including intermediate formation of molecular-adsorbed oxygen with its subsequent dissociation and insertion of atomic-adsorbed oxygen in the volume of the catalyst. The kinetics of the interaction of methane with the oxidized catalyst was well described by the first order equation.

Key word oxidative coupling of methane, perovskite catalyst, TAP method.