Reaction of CO oxidation on platinum, rhodium, a platinum-rhodium alloy, and a heterophase bimetallic platinum/rhodium surface

Author： Kalinkin A.   Pashis A.   Bukhtiyarov V.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 0023-1584

Source： Kinetics and Catalysis, Vol.48, Iss.2, 2007-03, pp. : 298-304

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Abstract

The reaction of CO oxidation on thin metal films of platinum, rhodium, and their alloy and on a heterophase bimetallic Pt/Rh surface that consisted of platinum particles of size 10–20 nm on the surface of rhodium was studied in the region of low reactant pressures (lower than 2 × 10−5 mbar). At low temperatures (T < 200°C), the activity of samples increased in the order Rh > Pt/Rh > Pt-Rh alloy > Pt. Above 200°C, the rate of reaction on the heterophase Pt/Rh surface was almost twice as high as the sum of the rates of reaction on the individual metals; this fact is indicative of a synergistic effect. The nature of this effect is considered.

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