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Low temperature SCR reaction over Nano-Structured Fe-Mn Oxides: Characterization, performance, and kinetic study.
- Source :
-
Applied Surface Science . Nov2018, Vol. 457, p1116-1125. 10p. - Publication Year :
- 2018
-
Abstract
- Fe-Mn oxides was prepared by thermal activation of Mn-rich limonite at different temperatures, and then developed as catalysts for low-temperature NH 3 -SCR. The obtained samples were characterized by XRD, XRF, TEM, XPS, BET, H 2 -TPR, NH 3 -TPD, NH 3 -SCR model reaction and in situ DRIFTS. The results indicated that Fe-Mn oxides catalyst derived from the thermal treatment at 300 °C (H300) exhibited an excellent NO conversion which was higher than 90% at a temperature range from 130 to 300 °C. The large surface area (95.9 m 2 /g), large amount of acid sites, suitable reduction behavior, and abundant surface hydroxyl positively responsed to the excellent performance of H300 for NH 3 -SCR. The results of in situ DRIFTS and kinetic study demonstrated that when the SCR reaction temperature reached to 100 °C, both the Eley–Rideal mechanism and the Langmuir-Hinshelwood mechanism might happen over H300. However, the Langmuir-Hinshelwood mechanism could be approximately neglected at higher reaction temperatures. This study favors the understanding of NH 3 -SCR mechanism of the prepared provides Fe-Mn oxides and explores new application field for Mn-rich limonite in low-temperature NH 3 -SCR. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LIMONITE
*CATALYSTS
*OXIDES
*LANGMUIR isotherms
*HYDROXYL group
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 457
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 131293624
- Full Text :
- https://doi.org/10.1016/j.apsusc.2018.07.019