Journal
CHEMICAL ENGINEERING JOURNAL
Volume 271, Issue -, Pages 23-30Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.02.072
Keywords
Identification; Species; Valence states; MnOx/TiO2 catalysts; SCR
Categories
Funding
- National Twelfth Five-Year Plan for Science & Technology Support of China [2011BAE29B02]
- Research and Test Center of Materials, Wuhan University of Technology
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology
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As the selective catalytic reduction (SCR) catalysts for NOx removal, various Mn-based catalysts have been widely investigated in the academic world. However, few studies focus on the identification of MnOx species and Mn valence states in Mn-based catalysts. In this study, Mn-based catalysts, which were prepared by using different precursors or pure MnOx species, were investigated for their activities for SCR of NO by NH3. Meanwhile, according to XRD, TG and H-2-TPR measurement, a mass of crystalline and/or amorphous MnOx species were detected, while a very small amount of amorphous MnOx species could be observed with the TG-DSC-MS by detecting the oxygen coming from manganese oxides because of the decomposition. In addition, the contents and distributions of Mn2+, Mn3+ and Mn4+ as well at the average valences of manganese in catalysts were tested with the chemical titration method, while the XPS results could not identify the MnOx species, showing a semi-quantitative assessment of Mn2+, Mn3+ and Mn4+ contents. Furthermore, based on the SCR performance, Mn2O3 and Mn3O4 species were active for NOx reduction. (C) 2015 Elsevier B.V. All rights reserved.
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