Journal
JOURNAL OF THE ENERGY INSTITUTE
Volume 94, Issue -, Pages 73-84Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.joei.2020.11.001
Keywords
De-NOx; NH3-SCR; Ce-Nb-Ti oxide; Single step sol-gel method; Activity
Categories
Funding
- National Natural Science Foundation of China [51506226, 51906258]
- Key Research and Development Program of Shandong Province [2019JZZY010403]
- Natural Science Foundation of Shandong Province [ZR2015EM010]
- Fundamental Research Funds for the Central Universities [19CX02031A]
- Ningbo Natural Science Foundation [2018A610207]
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Ce20Nb20Ti catalyst showed excellent NH3-SCR activity and great resistance, attributed to strong interaction among Ce, Nb, and Ti species and their effects on the catalyst surface.
A series of Ce-Nb-Ti oxide catalysts synthesized by a single step sol-gel (SG) method were evaluated and characterized for selective catalytic reduction (SCR) of NO with ammonia. The experimental results showed that the doping of Nb could enhance the catalytic activity of CeO2/TiO2 significantly. Ce20Nb20Ti exhibited the best NH3-SCR activity and great resistance to high gas hourly space velocity (GHSV), H2O, and SO2. Its superior SCR performance could be ascribed to the better dispersion of Ce, more chemisorbed oxygen species and Ce3+/Ce4+ redox pairs on the catalyst surface, increased redox ability and surface acidity, and strong interaction among Ce, Nb, and Ti species after the introduction of Nb2O5. In situ DRIFT results revealed that the doping of Nb was conducive to the adsorption of NOx and NH3 species, and enhanced the reaction of pre-adsorbed NH3 species with NOx species and that of adsorbed NOx species with NH3 species. (C) 2020 Energy Institute. Published by Elsevier Ltd. All rights reserved.
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