Acid treatment of ZrO2-supported CeO2 catalysts for NH3-SCR of NO: Influence on surface acidity and reaction mechanism

2021 ◽  
Author(s):  
Xiaodi Li ◽  
Zhitao Han ◽  
Xinxin Wang ◽  
Shaolong Yang ◽  
Gang Liu ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Acid Treatment ◽  
Surface Acidity ◽  
Nh3 Scr ◽  
Scr Of No

Doping effect of Sm on the TiO2/CeSmOx catalyst in the NH3-SCR reaction: structure–activity relationship, reaction mechanism and SO2 tolerance

2019 ◽  
Vol 9 (13) ◽  
pp. 3554-3567 ◽  
Author(s):  
Hao Liu ◽  
Chuanzhi Sun ◽  
Zhongxuan Fan ◽  
XuanXuan Jia ◽  
Jingfang Sun ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
High Activity ◽  
Surface Acidity ◽  
Redox Properties ◽  
Doping Effect ◽  
Activity Relationship ◽  
Good Balance ◽  
Nh3 Scr ◽  
Structure Activity ◽  
So2 Tolerance

A good balance between the redox properties and surface acidity induces the high activity of the Sm doped TiO2/CeO2 catalyst.

Influence of preparation methods on iron-tungsten composite catalyst for NH3-SCR of NO: The active sites and reaction mechanism

2020 ◽  
Vol 503 ◽  
pp. 144190 ◽  
Author(s):  
Qiulin Zhang ◽  
Yaqing Zhang ◽  
Tengxiang Zhang ◽  
Huimin Wang ◽  
YanPing Ma ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Composite Catalyst ◽  
Preparation Methods ◽  
Nh3 Scr ◽  
Scr Of No

scholarly journals Highly efficient NH3-SCR of NO over MnFeW/Ti catalyst at low temperature: SO2 tolerance and reaction mechanism

Fuel ◽  
2022 ◽  
Vol 307 ◽  
pp. 121805
Author(s):  
Lijun Liu ◽  
Sheng Su ◽  
Dezhi Chen ◽  
Tao Shu ◽  
Xiaotao Zheng ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Low Temperature ◽  
Highly Efficient ◽  
Nh3 Scr ◽  
Scr Of No ◽  
So2 Tolerance

Lead poisoning and regeneration of Mn-Ce/TiO2 catalysts for NH3-SCR of NO at low temperature

2021 ◽  
Vol 49 (1) ◽  
pp. 113-120
Author(s):  
Dong-jie YAN ◽  
Tong GUO ◽  
Ya YU ◽  
Zhao-hui CHEN
Keyword(s):  
Low Temperature ◽  
Lead Poisoning ◽  
Nh3 Scr ◽  
Scr Of No

scholarly journals Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 55
Author(s):  
Katarzyna Świrk ◽  
Ye Wang ◽  
Changwei Hu ◽  
Li Li ◽  
Patrick Da Costa ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Supported Catalysts ◽  
Catalytic Performance ◽  
Experimental Conditions ◽  
One Pot ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Temperature Programmed ◽  
Stationary Sources

Copper and iron promoted ZrO2 catalysts were prepared by one-pot synthesis using urea. The studied catalysts were characterized by XRD, N2 physisorption, XPS, temperature-programmed desorption of NH3 (NH3-TPD), and tested by the selective catalytic reduction by ammonia (NH3-SCR) of NO in the absence and presence of water vapor, under the experimental conditions representative of exhaust gases from stationary sources. The influence of SO2 on catalytic performance was also investigated. Among the studied catalysts, the Fe-Zr sample showed the most promising results in NH3-SCR, being active and highly selective to N2. The addition of SO2 markedly improved NO and NH3 conversions during NH3-SCR in the presence of H2O. The improvement in acidic surface properties is believed to be the cause.

Nb2O5-modified Mn-Ce/AC catalyst with high ZnCl2 and SO2 tolerance for low-temperature NH3-SCR of NO

2021 ◽  
Vol 9 (5) ◽  
pp. 106323
Author(s):  
Yuhan Zhou ◽  
Buxin Su ◽  
Shan Ren ◽  
Zhichao Chen ◽  
Zenghui Su ◽  
...  
Keyword(s):  
Low Temperature ◽  
Nh3 Scr ◽  
Scr Of No ◽  
So2 Tolerance

A Study of Surface Modification on Adsorption Behaviors of Nanoporous Carbon

2007 ◽  
Vol 119 ◽  
pp. 211-214 ◽  
Author(s):  
Byeoung Ku Kim ◽  
Young Seak Lee ◽  
Seung Kon Ryu ◽  
Byung Joo Kim ◽  
Soo Jin Park
Keyword(s):  
Nitric Acid ◽  
Functional Groups ◽  
Carbon Fibers ◽  
Acid Treatment ◽  
Surface Acidity ◽  
Activated Carbon Fibers ◽  
Adsorption Behaviors ◽  
Toxic Gases ◽  
Adsorption Amount ◽  
Polar Functional Groups

In this work, to introduce polar functional groups on carbon surfaces, activated carbon fibers (ACFs) were treated by nitric acid in order to enhance the adsorption capacity of propylamine which was one of toxic gases in cigarette smoke. It was found that the polar functional groups were predominantly increased up to 2.0 M of nitric acid, resulting in the increase of total surface acidity. It was found that the adsorption amount of propylamine of the modified ACFs was increased around 17% after a nitric acid treatment. From the XPS results, it was observed that propylamine was reacted with strong or weak polar (acidic) groups, such as COOH, -COO or OH existed on the ACF surfaces.

Theoretical guidance and experimental confirmation on catalytic tendency of M-CeO2 (M = Zr, Mn, Ru or Cu) for NH3-SCR of NO

2017 ◽  
Vol 43 (13-16) ◽  
pp. 1240-1246 ◽  
Author(s):  
Phornphimon Maitarad ◽  
Jin Han ◽  
Supawadee Namuangruk ◽  
Liyi Shi ◽  
Chirawat Chitpakdee ◽  
...  
Keyword(s):  
Experimental Confirmation ◽  
Nh3 Scr ◽  
Scr Of No

scholarly journals Catalytic Activity Of Cu/η-Al2O3 Catalysts Prepared From Aluminum Scraps In The NH3-SCO and in the NH3-SCR of NO

2021 ◽  
Author(s):  
Nawel Jr ◽  
Thabet Makhlouf ◽  
Gerard Delahay ◽  
Hassib Tounsi
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Reduction ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Reduction Of No ◽  
Evaporation Method ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Selective Catalytic Oxidation ◽  
Wet Impregnation Method

Abstract Copper loaded η-alumina catalysts with different copper contents have been prepared by impregnation/evaporation method. The catalysts were characterized by XRD, FTIR, BET, UV–vis, H2-TPR and evaluated in the selective catalytic reduction of NO by NH3 and in the selective catalytic oxidation of NH3. The characterization techniques showed that the impregnation/evaporation method permits to obtain highly dispersed copper oxide species on the η-alumina surface when low amount of copper is used (1wt. % and 2 wt.%). The wet impregnation method made it possible to reach a well dispersion of the copper species on the surface of the alumina for the low copper contents Cu(1)-Al2O3 and Cu(2)-Al2O3. The latter justifies the similar behavior of Cu(1)-Al2O3) and Cu(2)-Al2O3 in the selective catalytic oxidation of NH3 where these catalysts exhibit a conversion of NH3 to N2 of the order of 100% at T > 500°C.

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