Journal
APPLIED SURFACE SCIENCE
Volume 428, Issue -, Pages 924-932Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.09.131
Keywords
Selective catalytic reduction (SCR); Low temperature; MnOx-CeO2 hollow nanotube; Catalyst
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Funding
- National Key Research and Development Program of China [2017YFC0210303]
- National Natural Science Foundation of China [U1660109, 21677010, 21507004]
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MnOx-CeO2 hollow nanotube was synthesized for the low temperature selective catalytic reduction (SCR) of NOx with NH3. The nanotube was fabricated firstly through the interfacial oxidation-reduction reaction by dealing the Ce(OH)CO3 intermediate with KMnO4 aqueous solution, then followed by selective wash with HNO3. The catalysts were systematically examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, NH3 temperature-programmed desorption measurements and catalytic activity test. It was found that the as-prepared MnOx-CeO2-B nanotube exhibited best NOx removal efficiency among the catalysts investigated, where 96% NOx conversion at 100 degrees C at a space velocity of 30000 h(-1) was obtained. Meanwhile, superior resistance to H2O and SO2 was achieved as well as high thermal stability. On the basis of various analysis results, the remarkable de-NOx performance of the MnOx-CeO2-B nanobube could be attributed to the uniform distribution of active species, abundant content of Mn4+ and O-alpha species, and especially the hollow porous architectures provided huge specific surface area and sufficient acidic sites. (C) 2017 Elsevier B.V. All rights reserved.
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