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.

Heteropoly acid promoted Cu and Fe catalysts for the selective catalytic reduction of NO with ammonia

2011 ◽  
Vol 176 (1) ◽  
pp. 292-297 ◽  
Author(s):  
Siva Sankar Reddy Putluru ◽  
Susanne Mossin ◽  
Anders Riisager ◽  
Rasmus Fehrmann
Keyword(s):  
Selective Catalytic Reduction ◽  
Heteropoly Acid ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Fe Catalysts

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.

Effect of Fe on the Selective Catalytic Reduction of NO by NH3 at Low Temperature over Mn/CeO2-TiO2 Catalyst

2012 ◽  
Vol 27 (5) ◽  
pp. 495-500 ◽  
Author(s):  
Da-Wang WU ◽  
Qiu-Lin ZHANG ◽  
Tao LIN ◽  
Mao-Chu GONG ◽  
Yao-Qiang CHEN
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No

The synergistic effects between Ce and Cu in CuyCe1−yW5Ox catalysts for enhanced NH3-SCR of NOx and SO2 tolerance

2019 ◽  
Vol 9 (3) ◽  
pp. 718-730 ◽  
Author(s):  
Jian-Wen Shi ◽  
Yao Wang ◽  
Ruibin Duan ◽  
Chen Gao ◽  
Baorui Wang ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Selective Catalytic Reduction ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Synergistic Effects ◽  
Reduction Of No ◽  
Nh3 Scr ◽  
So2 Tolerance ◽  
Scr Of Nox

Non-manganese-based metal oxides are promising catalysts for the NH3-SCR (selective catalytic reduction) of NOx at low temperatures.

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