期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 166, 期 -, 页码 302-312出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2014.11.018
关键词
Mercury oxidation; SCR; Gold-based catalysts; SO2/SO3 conversion; DeNO(x) activity
资金
- European Union Erasmus
- Gheorghe Asachi Technical University of Iasi, Romania
The investigation aims to develop SCR-catalysts with enhanced oxidation activity for elemental mercury. For this, different nano-sized TiO2 particles were coated with 1 and 2 wt.% gold. Suspensions obtained from these particles were used for dip-coating the commercial honeycomb-shaped V2O5-WO3/TiO2 reference SCR catalyst. The mercury oxidation activities of the Au/TiO2-coated catalysts were investigated in the laboratory for the temperature range 180-390 degrees C and simulated coal-fuel flue gas conditions (O-2, SO2, NO, H2O, Hg, HCl and without NH3). At reaction temperatures from 180 to 320 degrees C, Au/TiO2 coatings enhanced the mercury oxidation activity of the SCR catalyst significantly by a factor of 2. At higher reaction temperatures the positive effect of the Au/TiO2 coatings on mercury oxidation decreased and was strongly dependent on the HCl content of the flue gas. The impact of Au/TiO2 coatings on the DeNO(x) activity of the SCR catalysts at 390 degrees C was only marginal. The measured SO2/SO3 conversion activity rates depended on the coating procedure and the gold,content of the catalysts. In conclusion, the Au/TiO2 coatings are promising for the development of multi-pollutant SCR-DeNO(x) catalysts with high mercury co-oxidation activity for cold-site configurations or flue gases with higher HCl contents. (C) 2014 Elsevier B.V. All rights reserved.
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