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FIZIKA A 4 (1995) 2, 163-170
 
MOLECULAR BEAM STUDY OF OXYGEN CHEMISORPTION ON ALUMINA SUPPORTED Pd
PARTICLES
IVA STARÁ and VLADIMÍR MATOLÍN
Department of Electronics and Vacuum Physics, Faculty of Mathematics and Physics,
Charles University, V Holešoviekách 2, 18000 Prague 8, Czech Republic
Received 7 April 1995
Revised manuscripr received 14 August 1995
The adsorption of oxygen on g-alumina supported Pd particles
and Pd(111) single crystal has been studied by means of the thermal molecular beam
technique at temperatures between 300 and 550 K. The temperature and coverage dependent
sticking coefficient has been measured for all samples. In the case of small particles,
the initial integral sticking coefficient increased after the first oxygen saturation and
its value was found to be abnormally high. These effects can be explained by the diffusion
of oxygen across the support surface and/or by the oxygen induced reconstruction of
supported palladium particles.
UDC 538.971
PACS 82.65.My
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