A highly active VO -MnO /CeO2 for selective catalytic reduction of NO: The balance between redox property and surface acidity

2020 ◽  
Author(s):  
Yang Runnong ◽  
Gao Zihan ◽  
Sun Ming ◽  
Fu Guangying ◽  
Cheng Gao ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Redox Property ◽  
Reduction Of No ◽  
Highly Active

Surface acidity enhancement of CeO2 catalysts via modification with a heteropoly acid for the selective catalytic reduction of NO with ammonia

2019 ◽  
Vol 9 (20) ◽  
pp. 5774-5785 ◽  
Author(s):  
Yu Ke ◽  
Wenjun Huang ◽  
Sichao Li ◽  
Yong Liao ◽  
Jiaxing Li ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Heteropoly Acid ◽  
Reaction Path ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Reduction Of No

The surface acidity enhanced CeO2 catalysts exhibited a SCR reaction path that both mechanisms existed but E-R dominated.

Reduced TiO2 inducing highly active V2O5 species for selective catalytic reduction of NO by NH3

2020 ◽  
Vol 750 ◽  
pp. 137494 ◽  
Author(s):  
Xiaohai Li ◽  
Zihua Wu ◽  
Yiqing Zeng ◽  
Jiayou Han ◽  
Shule Zhang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Highly Active

A highly active intra-zeolite iron site for the selective catalytic reduction of NO by isobutane

2001 ◽  
Vol 2 (10) ◽  
pp. 317-321 ◽  
Author(s):  
Frank Heinrich ◽  
Carmen Schmidt ◽  
Elke Löffler ◽  
Wolfgang Grünert
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Iron Site ◽  
Reduction Of No ◽  
Highly Active

A novel Ce–Sb binary oxide catalyst for the selective catalytic reduction of NOx with NH3

2016 ◽  
Vol 6 (22) ◽  
pp. 8063-8071 ◽  
Author(s):  
Zhiming Liu ◽  
Haiyan Liu ◽  
Hui Zeng ◽  
Qi Xu
Keyword(s):  
Selective Catalytic Reduction ◽  
Oxide Catalyst ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Synergetic Effect ◽  
Binary Oxide ◽  
Redox Property ◽  
Reduction Of Nox

The synergetic effect between Sb and Ce not only increases the surface acidity of the catalyst but also enhances the redox property, both of which contribute to improving NH3-SCR activity.

Controllable synthesis of Ce-doped α-MnO2for low-temperature selective catalytic reduction of NO

2017 ◽  
Vol 7 (7) ◽  
pp. 1565-1572 ◽  
Author(s):  
Yajuan Wei ◽  
Jia Liu ◽  
Wei Su ◽  
Yan Sun ◽  
Yanli Zhao
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
High Performance ◽  
Catalytic Reduction ◽  
Controllable Synthesis ◽  
Reduction Of No ◽  
Highly Active

On account of the highly active exposed Mn atom on α-MnO2with a mesoporous channel, the catalyst exhibits high performance for NH3-based selective catalytic reduction of NO.

Catalysts based on pillared interlayered clays for the selective catalytic reduction of NO

Clay Minerals ◽  
1997 ◽  
Vol 32 (1) ◽  
pp. 123-134 ◽  
Author(s):  
S. Perathoner ◽  
A. Vaccari
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Reduction Of No ◽  
Cu Content ◽  
Scr Of No ◽  
Catalytic Behaviour ◽  
Reduced Rate ◽  
Cu Ions ◽  
Catalytic Performances

AbstractThe reactivity of an Al-pillared interlayered clay (PILC) (AZA) and a mixed Fe/Al-PILC (FAZA), used as references by the Concerted European Action-Pillared Layered Structure (CEA-PLS), was investigated in the selective catalytic reduction (SCR) of NO by NH3 or propane, as either catalysts or as supports of Cu ions. Both AZA and FAZA, either with or without Cu were found to be inactive in the reduction of NO with propane and oxygen. This is different from the behaviour with alumina with or without Cu, because of the different surface acidity properties. Good NO conversions were observed for both PILCs using NH3. The best catalytic performances were shown by FAZA, but the activity of AZA was also remarkable. The addition of Cu ions to both AZA and FAZA leads to an improvment in the activity in NO conversion and a reduction in the side formation of N2O. The catalytic behaviour was found to depend on the method of Cu addition, the Cu loading and the nature of the PILC. With AZA the best results were obtained for a Cu content up to 2 wt%, while further increases in the amount of Cu resulted in a considerable decrease in the conversion of NO. With FAZA, on the other hand, a high activity was observed at up to 3% of Cu introduced by ion exchange. By comparison with other Cu containing catalysts, Cu-FAZA allows operation in a wider range of reaction temperatures due to the reduced rate of side ammonia combustion. The surface acidity properties of AZA and FAZA were also characterized to interpret the above effects.

scholarly journals The Deactivation Mechanism of the Mo-Ce/Zr-PILC Catalyst Induced by Pb for the Selective Catalytic Reduction of NO with NH3

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2641
Author(s):  
Chenxi Li ◽  
Jin Cheng ◽  
Qing Ye ◽  
Fanwei Meng ◽  
Xinpeng Wang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Catalyst Activity ◽  
Acid Sites ◽  
Nh3 Scr ◽  
Highly Active ◽  
Negative Effect ◽  
Redox Ability ◽  
Deactivation Mechanism

As a heavy metal, Pb is one component in coal-fired flue gas and is widely considered to have a strong negative effect on catalyst activity in the selective catalytic reduction of NOx by NH3 (NH3-SCR). In this paper, we investigated the deactivation mechanism of the Mo-Ce/Zr-PILC catalyst induced by Pb in detail. We found that NO conversion over the 3Mo4Ce/Zr-PILC catalyst decreased greatly after the addition of Pb. The more severe deactivation induced by Pb was attributed to low surface area, lower amounts of chemisorbed oxygen species and surface Ce3+, and lower redox ability and surface acidity (especially a low number of Brønsted acid sites). Furthermore, the addition of Pb inhibited the formation of highly active intermediate nitrate species generated on the surface of the catalyst, hence decreasing the NH3-SCR activity.

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