Novel proposition on mechanism aspects over Fe–Mn/ZSM-5 catalyst for NH3-SCR of NOx at low temperature: rate and direction of multifunctional electron-transfer-bridge and in situ DRIFTs analysis

2016 ◽  
Vol 6 (20) ◽  
pp. 7532-7548 ◽  
Author(s):  
Wentao Mu ◽  
Jing Zhu ◽  
Shen Zhang ◽  
Yuyu Guo ◽  
Liqing Su ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Low Temperature ◽  
Synergistic Effects ◽  
In Situ Drifts ◽  
Nh3 Scr ◽  
Temperature Rate ◽  
Scr Of Nox

Most outstanding activities achieved over 15Fe–Mn/ZSM-5 catalyst on account of synergistic effects between RMETB and DMETB.

scholarly journals Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 618
Author(s):  
Huan Du ◽  
Zhitao Han ◽  
Xitian Wu ◽  
Chenglong Li ◽  
Yu Gao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalyst Surface ◽  
Impregnation Method ◽  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Nh3 Adsorption ◽  
So2 Resistance ◽  
Fast Scr

Er-modified FeMn/TiO2 catalysts were prepared through the wet impregnation method, and their NH3-SCR activities were tested. The results showed that Er modification could obviously promote SO2 resistance of FeMn/TiO2 catalysts at a low temperature. The promoting effect and mechanism were explored in detail using various techniques, such as BET, XRD, H2-TPR, XPS, TG, and in-situ DRIFTS. The characterization results indicated that Er modification on FeMn/TiO2 catalysts could increase the Mn4+ concentration and surface chemisorbed labile oxygen ratio, which was favorable for NO oxidation to NO2, further accelerating low-temperature SCR activity through the “fast SCR” reaction. As fast SCR reaction could accelerate the consumption of adsorbed NH3 species, it would benefit to restrain the competitive adsorption of SO2 and limit the reaction between adsorbed SO2 and NH3 species. XPS results indicated that ammonium sulfates and Mn sulfates formed were found on Er-modified FeMn/TiO2 catalyst surface seemed much less than those on FeMn/TiO2 catalyst surface, suggested that Er modification was helpful for reducing the generation or deposition of sulfate salts on the catalyst surface. According to in-situ DRIFTS the results of, the presence of SO2 in feeding gas imposed a stronger impact on the NO adsorption than NH3 adsorption on Lewis acid sites of Er-modified FeMn/TiO2 catalysts, gradually making NH3-SCR reaction to proceed in E–R mechanism rather than L–H mechanism. DRIFTS.

MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) for Low-Temperature NH3-SCR and In Situ DRIFTS Study Reaction Mechanism

2020 ◽  
Vol 12 (43) ◽  
pp. 48476-48485
Author(s):  
Shangzhi Xie ◽  
Qiuju Qin ◽  
Hao Liu ◽  
Lijian Jin ◽  
Xiaoling Wei ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Low Temperature ◽  
In Situ Drifts ◽  
Nh3 Scr

An in-situ DRIFTs study of Mn doped FeVO4 catalyst by one-pot synthesis for low-temperature NH3-SCR

Fuel ◽  
2022 ◽  
Vol 309 ◽  
pp. 122108
Author(s):  
Heng Xie ◽  
Daobing Shu ◽  
Tianhu Chen ◽  
Haibo Liu ◽  
Xuehua Zou ◽  
...  
Keyword(s):  
Low Temperature ◽  
One Pot ◽  
In Situ Drifts ◽  
One Pot Synthesis ◽  
Nh3 Scr ◽  
Mn Doped

Investigation of the common intermediates over Fe-ZSM-5 in NH3-SCR reaction at low temperature by in situ DRIFTS

2020 ◽  
Vol 94 ◽  
pp. 32-39
Author(s):  
Xiaoyan Shi ◽  
Yingjie Wang ◽  
Yulong Shan ◽  
Yunbo Yu ◽  
Hong He
Keyword(s):  
Low Temperature ◽  
In Situ Drifts ◽  
Nh3 Scr ◽  
The Common

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.

In situ-DRIFTS Study of Sb–V–CeO2/TiO2 Catalyst Under Standard and Fast NH3-SCR Conditions

2017 ◽  
Vol 60 (9-11) ◽  
pp. 755-762 ◽  
Author(s):  
Young Eun Jeong ◽  
Pullur Anil Kumar ◽  
Danh Thi Huong ◽  
Heon Phil Ha ◽  
Kwan-Young Lee
Keyword(s):  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr

Time-resolved in situ DRIFTS study on NH3–SCR of NO on CeO2/TiO2 catalyst

2022 ◽  
Author(s):  
Jie Yang ◽  
Shan Ren ◽  
Mingming Wang ◽  
Zhicaho Chen ◽  
Lin Chen ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Time Resolved ◽  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Scr Of No

Ce–Ti catalysts were considered as promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, CeO2/TiO2 catalyst was...

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