Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 8, Pages 5224-5233Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10264
Keywords
Mn2O3-doped Fe2O3; hexagonal microsheets; low temperature; SCR; mechanism
Funding
- national natural science foundation of China [21377061, 81270041]
- Independent innovation fund of Tianjin University [2015XRG0020]
- Key Laboratory of Colloid and Interface Chemistry (Shandong University, Ministry of Education) [201401]
- Natural Science Foundation of Tianjin [13ZCZDSF00300, 15JCYBJC48400]
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Mn2O3-doped Fe2O3 hexagonal microsheets were prepared for the low-temperature selective catalytic reduction (SCR) of NO with NH3. These hexagonal microsheets were characterized by SEM, TEM, XRD, BET, XPS, NH3-TPD, H-2-TPR, and in situ DRIFT and were shown to exhibit a considerable uniform hexagonal microsheet structure and excellent low temperature SCR efficiency. When doped with different Mn molar ratios, Mn2O3 was detected in the Fe2O3 hexagonal microsheets based on the XRD results without the presence of other MnOX species. In addition, the hexagonal microsheets with a Mn/Fe molar ratio of 0.2 showed the best SCR removal performance among the materials, where a 98% NO conversion ratio at 200 degrees C at a space velocity of 30 000 h(-1) was obtained. Meanwhile, excellent tolerances to H2O and SO2, as well as high thermal stability, were obtained in Mn2O3-doped Fe2O3 hexagonal microsheets. Moreover, on the basis of the XPS and in situ DRIFT results, it can be suggested that coupled Mn2O3 nanocrystals played a key role at low temperatures and produced a possible redox reaction mechanism in the SCR process.
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