Abstract
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.
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Acknowledgements
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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Hartley, U.W., Tongnan, V., Laosiripojana, N. et al. Nitrous oxide decomposition over La0.3Sr0.7Co0.7Fe0.3O3−δ catalyst. Reac Kinet Mech Cat 125, 85–97 (2018). https://doi.org/10.1007/s11144-018-1398-9
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DOI: https://doi.org/10.1007/s11144-018-1398-9