Journal
AEROSOL AND AIR QUALITY RESEARCH
Volume 18, Issue 8, Pages 2121-2130Publisher
TAIWAN ASSOC AEROSOL RES-TAAR
DOI: 10.4209/aaqr.2018.02.0059
Keywords
Selective catalytic reduction; NO; NH3; CeO2-Nb2O5/TiO2; Impregnation method
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Funding
- National Natural Science Foundation of China [51506226]
- Natural Science Foundation of Shandong Province [ZR2015EM010]
- Fundamental Research Funds for the Central Universities [15CX05005A]
- China Scholarship Council, China (CSC) [201706455013]
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A series of CeO2-Nb2O5/TiO2 catalysts were prepared by an impregnation method and investigated for the selective catalytic reaction (SCR) of NO with NH3. The 15 wt.% CeO2-10 wt.% Nb2O5/TiO2 catalyst (CeNbTi) exhibited the highest activity and resistance to a high gas hourly space velocity and K2O. In the presence of H2O and SO2, it also showed better activity than the CeTi catalyst. The addition of Nb could improve the dispersion of CeO2 and increase the amount of Ce3+ and chemisorbed oxygen species on the catalyst surface, which enhances the catalytic activity of CeTi. The superior SCR activity of CeNbTi might also be attributed to its high redox ability, the enhanced adsorption capacity of NH3 species and the synergistic action between Ce, Nb and Ti species.
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