Nitrous oxide decomposition over La0.3Sr0.7Co0.7Fe0.3O3−δ catalyst
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Nano-sized La0.3Sr0.7Co0.7Fe0.3O3-δ (LSFC3773) was prepared as a catalyst for nitrous oxide (N2O) decomposition by a sonochemical method. The catalyst provided a complete conversion of N2O at 450 °C, showing the best performance among most recent industrial catalysts, and offered 99.7–100% conversion at higher temperatures, e.g., 540–600 °C. A suitable operating temperature range for the reaction to avoid NOx formation is from 400 to 600 °C. The activation energy and the pre-exponential factor were 42.96 kJ/mol and 161,135.35 mol/gcat h bar. Oxygen inhibition was observed and was more obvious as the sample approached full surface coverage (\(\theta \; = \;1\)) at 375 °C using a 100% N2O feed. The reaction occurred via the Eley–Rideal mechanism. Two possible model mechanisms were suggested according to the experimental phenomenon and the rate coefficient order of each elementary steps.
KeywordsNitrous oxide decomposition LSCF Sonochemical synthesis Eley–Rideal Nanoparticles
We would like to acknowledge the support from grants from the Thailand Research Fund (TRG5880059) and King Mongkut’s University of Technology North Bangkok (KMUTNB-GOV-59-43 and KMUTNB-NRU-58-14).
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