Journal ArticleDOI
Chemical poison and regeneration of SCR catalysts for NO x removal from stationary sources
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TLDR
In this paper, a review of chemical poisoning on V2O5-based catalysts, environmental-benign catalysts and low temperature catalysts is presented, where several poisons including alkali/alkaline earth metals, SO2 and heavy metals etc.Abstract:
Selective catalytic reduction (SCR) of NO
x
with NH3 is an effective technique to remove NO
x
from stationary sources, such as coal-fired power plant and industrial boilers. Some of elements in the fly ash deactivate the catalyst due to strong chemisorptions on the active sites. The poisons may act by simply blocking active sites or alter the adsorption behaviors of reactants and products by an electronic interaction. This review is mainly focused on the chemical poisoning on V2O5-based catalysts, environmental-benign catalysts and low temperature catalysts. Several common poisons including alkali/alkaline earth metals, SO2 and heavy metals etc. are referred and their poisoning mechanisms on catalysts are discussed. The regeneration methods of poisoned catalysts and the development of poison-resistance catalysts are also compared and analyzed. Finally, future research directions in developing poisoning resistance catalysts and facile efficient regeneration methods for SCR catalysts are proposed.read more
Citations
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Journal ArticleDOI
Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects.
Lupeng Han,Sixiang Cai,Sixiang Cai,Min Gao,Jun-ya Hasegawa,Penglu Wang,Jianping Zhang,Liyi Shi,Dengsong Zhang +8 more
TL;DR: This review summarizes the latest SCR reaction mechanisms and emerging poison-resistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VOx, MnOx, CeO2, and Fe2O3 to CuO based catalysts.
Journal ArticleDOI
A Perspective on the Selective Catalytic Reduction (SCR) of NO with NH3 by Supported V2O5–WO3/TiO2 Catalysts
Jun-Kun Lai,Israel E. Wachs +1 more
TL;DR: The supported V2O5-WO3/TiO2 catalysts have become the most widely used industrial catalysts for selective catalytic reduction (SCR) applications since introduction of this technology in the early 1970s as mentioned in this paper.
Journal ArticleDOI
New Insight into SO2 Poisoning and Regeneration of CeO2-WO3/TiO2 and V2O5-WO3/TiO2 Catalysts for Low-Temperature NH3-SCR.
TL;DR: It was observed that the low-temperature SCR (LT-SCR) activity decreased significantly over the 1%VWTi and 5%CeWTi catalysts, indicating that SO2 reacted with Ce3+/Ce4+, even in the presence of high concentration of NH3.
Journal ArticleDOI
Investigation of the Poisoning Mechanism of Lead on the CeO2-WO3 Catalyst for the NH3-SCR Reaction via in Situ IR and Raman Spectroscopy Measurement.
TL;DR: The in situ IR and Raman spectroscopy measurements were conducted to investigate lead poisoning on the CeO2-WO3 catalysts and the deactivation mechanisms were studied with respect to the changes of surface acidity, redox property, nitrate/nitrite adsorption behaviors, and key active sites.
Journal ArticleDOI
Mechanism by which Tungsten Oxide Promotes the Activity of Supported V 2 O 5 /TiO 2 Catalysts for NO X Abatement: Structural Effects Revealed by 51 V MAS NMR Spectroscopy.
Nicholas R. Jaegers,Nicholas R. Jaegers,Jun-Kun Lai,Yang He,Eric D. Walter,David A. Dixon,Monica Vasiliu,Ying Chen,Chongmin Wang,Mary Y. Hu,Karl T. Mueller,Israel E. Wachs,Yong Wang,Yong Wang,Jian Zhi Hu +14 more
TL;DR: In this paper, a 2-site mechanism for selective catalytic reduction (SCR) of NOx with NH3 to N2 with supported V2 O5 (-WO3 )/TiO2 catalysts is investigated.
References
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Journal ArticleDOI
Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review
TL;DR: In this paper, the open literature concerning chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia (SCR process) on metal oxide catalysts is reviewed, and the results of spectroscopic studies of the adsorbed surface species, adsorption-desorption measurements, flow reactor and kinetic experiments are analyzed.
Journal ArticleDOI
MnOx-CeO2 mixed oxides prepared by co-precipitation for selective catalytic reduction of NO with NH3 at low temperatures
TL;DR: In this paper, a series of manganese-cerium oxide catalysts were prepared by co-precipitation method and used for low temperature selective catalytic reduction of NO x with ammonia in the presence of excess O 2.
Journal ArticleDOI
Manganese oxide catalysts for NOx reduction with NH3 at low temperatures
TL;DR: In this article, the authors investigated the low temperature selective catalytic reduction (SCR) of NOx with NH 3 in the presence of excess O 2, and the active MnOx catalysts, precipitated with sodium carbonate and calcined in air at moderate temperatures such as 523 K and 623 K, have the high surface area, the abundant Mn 4+ species, and the high concentration of surface oxygen on the surface.
Journal ArticleDOI
Activity and selectivity of pure manganese oxides in the selective catalytic reduction of nitric oxide with ammonia
TL;DR: Manganese oxides of different crystallinity, oxidation state and specific surface area have been used in the selective catalytic reduction (SCR) of nitric oxide with ammonia, indicating a relation between the SCR process and active surface oxygen.
Journal ArticleDOI
Mechanism of the Selective Catalytic Reduction of Nitric Oxide by Ammonia Elucidated by in Situ On-Line Fourier Transform Infrared Spectroscopy
TL;DR: A fundamental microkinetic model is proposed, which accounts for the observed industrial kinetics performance and suggests a catalytic cycle that consists of both acid and redox reactions and involves both surface V-OH (Brønsted acid sites) and V=O species.