Self-oscillations of methane oxidation rate over Pd/Al2O3 catalysts: Role of Pd particle size |
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| Affiliation: | 1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Kosygina str. 4, 119991, GSP-1, Moscow, Russia;2. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Acad. Lavrentiev Pr. 5, 630090, Novosibirsk, Russia;3. Novosibirsk State University, Pirogova st. 5, 630090, Novosibirsk, Russia;4. Leibniz Institute for Catalysis, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany |
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| Abstract: | Oscillations of the methane oxidation rate were studied under methane-rich conditions on Pd/Al2O3 catalysts differing in Pd particle size. It was demonstrated that the temperature interval where oscillations occur narrows from 300–360 °C for the catalyst with Pd particle aggregates from 50–100 nm to 345–355 °C for the catalyst with isolated Pd particles of ~ 5 nm in size. At the same time, the period of oscillations showed ~ 6-fold increase. Structural transformations of Pd in the oscillation cycle were similar to those observed on bulk Pd used as a catalyst in the same reaction. |
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