Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 206, Issue -, Pages 449-460Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.01.036
Keywords
Vanadium; Ce(SO4)(2); Redox properties; Acidity; Alkali resistance
Funding
- Key Research & Development Plan of Shandong Province [2014GES0501]
- Environmental Welfare Project of Ministry of Environmental Projection of China [201509012]
- National Science and Technology Support Program [2015BAA05B02-2]
- National Key research and Development Plan [2016YFCO203701]
- National Science Foundation of China [51306079]
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A series of V-Ce(SO4)(2)/Ti catalysts for selective catalytic reduction (SCR) of NO with ammonia are prepared by impregnation method. Low temperature SCR activity and alkali resistance of the optimal V-0.5Ce(SO4)(2)/Ti sample are found to be better than on the commercial V-W/Ti catalyst. Also, V-0.5Ce(SO4)(2)/Ti shows an excellent durability in the presence of SO2 and H2O, indicating to have prospects for the industrial application. Based on catalysts characterization and in-situ DRIFTS studies, a higher proportion of surface active oxygen generated by the introduction of Ce and a Much faster H-2 reduction point out the improved redox properties of V-0.5Ce(SO4)(2)/Ti, which results in a stronger NO oxidative activation and is confirmed by a more abundant formation of surface NO and NO3-species. When exposed to SCR conditions where both NH3 and NO are present, this enhanced NO activation can produce more reactive nitrite and/or NO+ intermediates which then readily react with adsorbed NH3 and decorripose to N-2 and H2O, accounting for the improved SCR activity of V-0.5Ce(SO4)(2)/Ti at low temperatures. The addition of Ce(SO4)(2) also provides abundant reactive acid sites and adsorbed NH3 species thus increase. Even after Na poisoning, adequate surface acidity and redox properties still remain. Furthermore, relatively higher contents of V-OH are preserved owing to the interaction between Na and O=S=O, acting as a protection for the active sites. These promotional effects contribute to the better alkali resistance of V-0.5Ce(SO4)(2)/Ti. Therefore, all the results suggest that V-0.5Ce(SO4)(2)/Ti is a promising candidate as a catalyst for NH3-SCR in coal-fired power plants, especially under high Na-content conditions. (C) 2017 Elsevier B.V. All rights reserved.
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