05/01487 Influence of nitrogen surface functionalities onthe catalytic activity of activated carbon in low temperature SCR of NOx with NH3

2005 ◽  
Vol 46 (4) ◽  
pp. 224
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Low Temperature ◽  
Low Temperature Scr ◽  
Scr Of Nox

scholarly journals Performance of C2H4 Reductant in Activated-Carbon- Supported MnOx-based SCR Catalyst at Low Temperatures

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 123 ◽  
Author(s):  
Guangli Liu ◽  
Dongtai Han ◽  
Jie Cheng ◽  
Yongshi Feng ◽  
Wenbin Quan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Low Temperature ◽  
Active Sites ◽  
Catalyst Activity ◽  
Scr Catalyst ◽  
Scr Catalysts ◽  
Two Factors ◽  
Low Temperature Scr ◽  
Mn Concentration

Hydrocarbons as reductants show promising results for replacing NH3 in SCR technology. Therefore, considerable interest exists for developing low-temperature (<200 °C) and environmentally friendly HC-SCR catalysts. Hence, C2H4 was examined as a reductant using activated-carbon-supported MnOx-based catalyst in low-temperature SCR operation. Its sensitivity to Mn concentration and operating temperature was parametrically studied, the results of which showed that the catalyst activity followed the order of 130 °C > 150 °C > 180 °C with an optimized Mn concentration near 3.0 wt.%. However, rapid deactivation of catalytic activity also occurred when using C2H4 as the reductant. The mechanism of deactivation was explored and is discussed herein in which deactivation is attributed to two factors. The manganese oxide was reduced to Mn3O4 during reaction testing, which contained relatively low activity compared to Mn2O3. Also, increased crystallinity of the reduced manganese and the formation of carbon black occurred during SCR reaction testing, and these constituents on the catalyst’s surface blocked pores and active sites from participating in catalytic activity.

A comparative study of modified cotton biochar and activated carbon based catalysts in low temperature SCR

Fuel ◽  
2015 ◽  
Vol 156 ◽  
pp. 47-53 ◽  
Author(s):  
Boxiong Shen ◽  
Jianhong Chen ◽  
Shiji Yue ◽  
Guoliang Li
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
Comparative Study ◽  
Low Temperature Scr ◽  
Carbon Based

Facile and template-free fabrication of mesoporous 3D nanosphere-like MnxCo3−xO4 as highly effective catalysts for low temperature SCR of NOx with NH3

2018 ◽  
Vol 6 (7) ◽  
pp. 2952-2963 ◽  
Author(s):  
Xiaonan Hu ◽  
Lei Huang ◽  
Jianping Zhang ◽  
Hongrui Li ◽  
Kaiwen Zha ◽  
...  
Keyword(s):  
Low Temperature ◽  
Formation Mechanism ◽  
Operating Temperature ◽  
Synthesis Conditions ◽  
Highly Effective ◽  
Temperature Window ◽  
Template Free ◽  
Low Temperature Scr ◽  
Scr Of Nox

Mesoporous 3D nanosphere-like MnxCo3−xO4 was obtained via a template-free method. The formation mechanism was proposed and the synthesis conditions were carefully investigated. The operating temperature window was 75–325 °C when the NOx conversion was above 80%.

Preparation and Performance of Several Non-Precious Metal Oxides Catalysts for the Low Temperature SCR of NOx with NH3

2011 ◽  
Vol 356-360 ◽  
pp. 1528-1534
Author(s):  
Wei Fang Dong
Keyword(s):  
Low Temperature ◽  
Metal Oxides ◽  
Flue Gas ◽  
Precious Metal ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Low Temperature Scr ◽  
Scr Of Nox

A series of non-precious metal oxides catalysts were prepared for low-temperature selective catalytic reduction (SCR) of NOx with NH3 in a fixed bed reactor. The catalytic performance was evaluated by the removal efficiency of NOx and N2selectivity which were respectively detected by flue gas analyzer and flue gas chromatograph. Furthermore, the components of gas products from the above experiments were analysed with 2010 GC-MS. The results illustrated that the MnO2exhibited the highest NOx conversion to 95.46% and the highest selectivity of N2to 100% at temperature of 393K, then followed ZrO2, Al2O3and Fe2O3.

H2O and SO2 deactivation mechanism of MnOx/MWCNTs for low-temperature SCR of NOx with NH3

2013 ◽  
Vol 377 ◽  
pp. 154-161 ◽  
Author(s):  
Siwei Pan ◽  
Hongcheng Luo ◽  
Li Li ◽  
Zhengle Wei ◽  
Bichun Huang
Keyword(s):  
Low Temperature ◽  
So2 Deactivation ◽  
Low Temperature Scr ◽  
Scr Of Nox ◽  
Deactivation Mechanism
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