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- Title
Low-temperature NO<sub>x</sub> selective catalytic reduction activity evaluation of hollow-spherical manganese oxides.
- Authors
Liu, Fengyuan; Li, Junqi; Chen, Chaoyi; Ning, Deyang; Yang, Jian; Chu, Zhiyao; Mao, Xisong; Lan, Yuanpei
- Abstract
A novel tactic was employed to evaluate the low-temperature NH3-SCR (selective catalytic reduction) NOx removal property of manganese oxides (MnOx) in various valence states, avoiding the influences of size, morphology and synthetic method on catalytic activity. Firstly, similar sized hollow-spherical MnO2, Mn2O3, Mn3O4 and MnO were obtained by decomposing MnCO3 at 440 and 500 °C in Air, 430 °C in H2 and Ar, respectively. The orders of MnOx catalytic activity varied at different reaction temperature range, while MnO2 showed the best NO conversion. Surface acidity has significant influences on the SCR activity, Mn3O4 exhibits a better catalytic property than Mn2O3 below 300 °C, and conversely, Mn2O3 has a better high-temperature NO conversation than Mn3O4 due to a stronger NH3 adsorption ability above 300 °C. MnO will be oxidized in the studied atmosphere with 5% O2 to Mn3O4, Mn5O8 and finally to Mn2O3 successively, and the mixed phases of MnO/Mn3O4 or Mn3O4/Mn5O8 exhibit a better catalytic activity than Mn2O3 at 200–300 °C.
- Subjects
MANGANESE oxides; CATALYTIC activity; CATALYTIC reduction
- Publication
Research on Chemical Intermediates, 2022, Vol 48, Issue 7, p3007
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1007/s11164-022-04729-2