scholarly journals Study on the Mechanism of SO2 Poisoning of MnOx/PG for Lower Temperature SCR by Simple Washing Regeneration

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1360
Author(s):  
Xianlong Zhang ◽  
Shiwen Liu ◽  
Kang Ma ◽  
Yazhong Chen ◽  
Shi Jin ◽  
...  
Keyword(s):  
Low Temperature ◽  
Manganese Oxide ◽  
Active Component ◽  
Highly Efficient ◽  
So2 Poisoning ◽  
Lower Temperature ◽  
Low Temperature Scr ◽  
Scr Of Nox

Manganese oxide-supported palygorskite (MnOX/PG) catalysts are considered highly efficient for low-temperature SCR of NOx. However, the MnOX/PG catalyst tends to be poisoned by SO2. The effect of SO2 on activity of the SO2-pretreated poisoning catalysts under ammonia-free conditions was explored. It was determined that the MnOx/PG catalyst tends to be considerably deactivated by SO2 in the absence of ammonia and that water-washed regeneration can completely recover activity of the deactivated catalyst. Based on these results and characterizations of the catalysts, a reasonable mechanism for the deactivation of MnOx/PG catalyst by SO2 was proposed in this study. SO2 easily oxidized to SO3 on the surface of the catalyst, leading to the formation of polysulfuric acid, wrapping of the active component and blocking the micropores. The deactivation of the MnOx/PG catalyst is initially caused by the formation of polysulfuric rather than the deposition of ammonia sulfate, which occurs later.

A Novel MnOx Supported Palygorskite SCR Catalyst for Lower Temperature NO Removal from Flue Gases

2011 ◽  
Vol 356-360 ◽  
pp. 974-979 ◽  
Author(s):  
Xian Long Zhang ◽  
Bo Wen Shi ◽  
Xue Ping Wu ◽  
Wei Ping Jiang ◽  
Bao Jun Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Manganese Oxide ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Flue Gases ◽  
Scr Catalyst ◽  
No Removal ◽  
Highly Active ◽  
Lower Temperature ◽  
Scr Of Nox

Palygorskite supported manganese oxide catalysts (MnOx/PG) were prepared for lower temperature selective catalytic reduction (SCR) of NOx by NH3. Catalyst’s SCR activity was estimated at varied temperatures. Catalyst’s properties were characterized by XRD, NH3adsorption and TPD. Results showed that MnOx/PG catalyst was highly active for SCR at low-temperature. It was also found that NH3 was mainly adsorbed on palygorskite in two forms. Weakly adsorbed NH3, which was seldom inhibited by loading of MnOx, but was more favorable to SCR. Whereas strongly adsorbed NH3was more likely to be inhibited by MnOx loading but was inessential for SCR.

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

Potassium-incorporated manganese oxide enhances the activity and durability of platinum catalyst for low-temperature CO oxidation

2021 ◽  
Author(s):  
Xuelan Yan ◽  
Tao Gan ◽  
Shaozhen Shi ◽  
Juan Du ◽  
Guohao Xu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Manganese Oxide ◽  
Platinum Catalyst ◽  
Potassium Ions ◽  
Oxygen Species ◽  
Surface Oxygen ◽  
Highly Efficient ◽  
Low Temperature Co Oxidation

Potassium ions in the tunnel of MnO2 is demonstrated significantly enhancing the activity of surface oxygen species, which is favorable for preparing highly efficient Pt-based catalysts for low-temperature CO oxidation.

scholarly journals Promotion effect and mechanism of the addition of Mo on the enhanced low temperature SCR of NOx by NH3 over MnOx/γ-Al2O3 catalysts

2019 ◽  
Vol 245 ◽  
pp. 743-752 ◽  
Author(s):  
Gang Yang ◽  
Haitao Zhao ◽  
Xiang Luo ◽  
Kaiqi Shi ◽  
Haibao Zhao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Promotion Effect ◽  
Low Temperature Scr ◽  
Scr Of Nox

Ceria modified FeMnO —Enhanced performance and sulphur resistance for low-temperature SCR of NOx

2017 ◽  
Vol 206 ◽  
pp. 203-215 ◽  
Author(s):  
Liam John France ◽  
Qing Yang ◽  
Wan Li ◽  
Zhihang Chen ◽  
Jianyu Guang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Scr ◽  
Scr Of Nox
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