Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 75, Issue -, Pages 124-135Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2018.03.011
Keywords
NH3-SCR; SHS method; MnOx-CeO2-Al2O3 catalyst; NOx removal efficiency
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Funding
- National High Technology Research and Development Program of China (863 program) [2015AA03A401]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R46]
- program of Science and Technology Innovation Team in Bingtuan [2015BD003]
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We first present preparation of MnOx-CeO2-Al2O3 catalysts with varying Mn contents through a self-propagating high-temperature synthesis (SHS) method, and studied the application of these catalysts to the selective catalytic reduction of NOx with NH3 (NH3-SCR). Using the catalyst with 18 wt.% Mn (18MnCe1Al2), 100% NO conversion was achieved at 200 degrees C and a gas hourly space velocity of 15384 hr(-1), and the high-efficiency SCR temperature window, where NO conversion is greater than 90%, was widened to a temperature range of 150-300 degrees C. 18MnCe1Al2 showed great resistance to SO2 (100 ppm) and H2O (5%) at 200 degrees C. The catalysts were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and H2 temperature programmed reduction. The characterization results showed that the surface atomic concentration of Mn increased with increasing Mn content, which led to synergism between Mn and Ce and improved the activity in the SCR reaction. 18MnCe1Al2 has an extensive pore structure, with a BET surface area of approximately 135.4 m(2)/g, a pore volume of approximately 0.16 cm(3)/g, and an average pore diameter of approximately 4.6 nm. The SCR reaction on 18MnCe1Al2 mainly followed the Eley-Rideal mechanism. The performances of the MnOxCeO2-Al2O3 catalysts were good, and because of the simplicity of the preparation process, the SHS method is applicable to their industrial-scale manufacture. (c) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B. V.
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