期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 188, 期 1-3, 页码 105-109出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.01.078
关键词
SCR; MnO2; Hydrothermal method; NOx; Apparent activation energy
资金
- United Nations Industrial Development Organization (UNIDO) [TF/CPR/03/006]
- Environmentally Sustainable Management of Medical Wastes in China [C/V/S/10/251]
- National Foundation of Zhejiang Province, China [Z4080070]
- Foundation of Science and Technology Bureau of Zhejiang Province, China [2008C21057, 2009C34003]
- Fundamental Research Funds for the Central Universities [2010QNA4005]
MnO2 nanotubes, nanorods, and nanoparticles were prepared using a hydrothermal method, after which the different activities for selective catalytic reduction (SCR) of nitrogen oxides (NOx) were compared. MnO2 nanorods performed the highest activity for reduction of NOx under a gas hourly space velocity of 36,000h(-1) with conversion efficiencies of above 90% between 250 and 300 degrees C: it also had the highest removal efficiency of 98.2% at 300 degrees C. From the analysis of X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction, we can ascribe the high activity of MnO2 nanorods to low crystallinity, more lattice oxygen, high reducibility, and a large number of strong acid sites. The apparent activation energy of the SCR reaction on the surface of nanorods was calculated to be 20.9kJ/mol, which favored the reaction better than the other catalysts. (C) 2011 Elsevier B.V. All rights reserved.
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