Journal ArticleDOI
Combined Effect of H2O and SO2 on V2O5/AC Catalysts for NO Reduction with Ammonia at Lower Temperatures
Reads0
Chats0
TLDR
In this article, the combined effect of H 2 O and SO 2 on V 2 O 5 /AC was studied for selective catalytic reduction (SCR) of NO with NH 3 at lower temperatures.Abstract:
Combined effect of H 2 O and SO 2 on V 2 O 5 /AC the activity of catalyst for selective catalytic reduction (SCR) of NO with NH 3 at lower temperatures was studied. In the absence of SO 2 , H 2 O inhibits the catalytic activity, which may be attributed to competitive adsorption of H 2 O and reactants (NO and/or NH 3 ). Although SO 2 promotes the SCR activity of the V 2 O 5 /AC catalyst in the absence of H 2 O, it speeds the deactivation of the catalyst in the presence of H 2 O. The dual effect of SO 2 is attributed to the SO 4 2− formed on the catalyst surface, which stays as ammonium-sulfate salts on the catalyst surface. In the absence of H 2 O, a small amount of ammonium-sulfate salts deposits on the surface of the catalyst, which promote the SCR activity; in the presence of H 2 O, however, the deposition rate of ammonium-sulfate salts is much greater, which results in blocking of the catalyst pores and deactivates the catalyst. Decreasing V 2 O 5 loading decreases the deactivation rate of the catalyst. The catalyst can be used stably at a space velocity of 9000 h −1 and temperature of 250 °C.read more
Citations
More filters
Journal ArticleDOI
Low-temperature selective catalytic reduction of NOx with NH3 over metal oxide and zeolite catalysts—A review
TL;DR: In this paper, two types of low-temperature catalysts, the metal oxide catalyst and metal exchanged zeolite catalyst, were reviewed for selective catalytic reduction of NO x with ammonia (NH 3 -SCR) especially at temperature below 200°C.
Journal ArticleDOI
A review on selective catalytic reduction of NOx by supported catalysts at 100–300 °C—catalysts, mechanism, kinetics
TL;DR: In this article, the effect of different carriers with different active centers on the performance of low-temperature supported catalysts for removing NOx at low temperature was reviewed. But the authors did not consider the impact of different reducing agents and active centers.
Journal ArticleDOI
SO2 resistant antimony promoted V2O5/TiO2 catalyst for NH3-SCR of NOx at low temperatures
TL;DR: In this article, the low temperature sulfur resistant V 2 O 5 /TiO 2 catalysts were obtained by impregnation method and characterized by X-ray diffraction (XRD) and Brunner Emmett Teller surface area (BET-SA).
Journal ArticleDOI
Enhancement of Catalytic Activity Over the Iron-Modified Ce/TiO2 Catalyst for Selective Catalytic Reduction of NOx with Ammonia
TL;DR: A series of iron-modified Ce/TiO2 catalysts with different Fe/Ti molar ratios were prepared by an impregnation method and used for selective catalytic reaction (SCR) of NOx with NH3.
Journal ArticleDOI
Deactivation and regeneration of a commercial SCR catalyst: Comparison with alkali metals and arsenic
Yue Peng,Yue Peng,Junhua Li,Wenzhe Si,Jinming Luo,Yu Wang,Jie Fu,Xiang Li,John C. Crittenden,Jiming Hao +9 more
TL;DR: In this article, the authors studied the effect of poisons on commercial V 2 O 5 -WO 3 /TiO 2 for the SCR reaction using experiments and DFT calculations and found that poisoning of alkali metals and arsenic significantly decreased the amount of Bronsted acid sites and the reducibility of active V 5+ sites.
References
More filters
Journal ArticleDOI
Superior Fe-ZSM-5 catalyst for selective catalytic reduction of nitric oxide by ammonia
Richard Q. Long,Ralph T. Yang +1 more
TL;DR: In this paper, the authors report a superior Fe-ZSM-5 catalyst that is much more active than the commercial vanadia catalysts and does not have the deficiencies associated with the vanadia catalyst.
Journal ArticleDOI
Reactivity of V2O5Catalysts for the Selective Catalytic Reduction of NO by NH3: Influence of Vanadia Loading, H2O, and SO2
TL;DR: In this paper, a systematic investigation of the selective catalytic reduction (SCR) of NO by NH3over V2O5/TiO2catalysts of variable vanadia loading has been carried out at 623 K. The structure of various catalysts, as well as adsorbed species present on their surface, was characterized byin situRaman and infrared spectroscopies.
Journal ArticleDOI
Deactivation by SO2 of MnOx/Al2O3 catalysts used for the selective catalytic reduction of NO with NH3 at low temperatures
TL;DR: In this article, the impact of low concentrations of SO 2 on the activity of low loaded alumina supported manganese oxides has been investigated, and it was shown that the deactivation is not due to the formation of (bulk or surface) Al 2 (SO 4 ) 3 or deposition of ammonium sulphates.
Journal ArticleDOI
Environmental catalysis for stationary applications
TL;DR: In this paper, the selective catalytic reduction (SCR) of NOx by ammonia and in the catalytic combustion (CC) for gas turbines are reviewed as major examples of environmental catalysis for stationary applications.
Journal ArticleDOI
Selective Catalytic Reduction of Nitrogen Oxides by Ammonia over Fe3+-Exchanged TiO2-Pillared Clay Catalysts
Richard Q. Long,Ralph T. Yang +1 more
TL;DR: In this article, Fe-exchanged TiO2-pillared clay (PILC) catalysts were used for selective catalytic reduction (SCR) of NOx by ammonia.