Transient Kinetic Analysis of Low-Temperature NH3-SCR over Cu-CHA Catalysts Reveals a Quadratic Dependence of Cu Reduction Rates on CuII

ACS Catalysis ◽  
2021 ◽  
pp. 4821-4831
Author(s):  
Federica Gramigni ◽  
Nicole Daniela Nasello ◽  
Nicola Usberti ◽  
Umberto Iacobone ◽  
Tommaso Selleri ◽  
...  
Keyword(s):  
Low Temperature ◽  
Kinetic Analysis ◽  
Quadratic Dependence ◽  
Nh3 Scr

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.

Promotional effect and mechanism of the modification of Ce on the enhanced NH3-SCR efficiency and the low temperature hydrothermal stability over Cu/SAPO-34 catalysts

2021 ◽  
Vol 617 ◽  
pp. 118110
Author(s):  
Bin Guan ◽  
Han Jiang ◽  
Xuesong Peng ◽  
Yanfei Wei ◽  
Ziqian Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrothermal Stability ◽  
Nh3 Scr ◽  
Promotional Effect

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

Development of a Cs-Ru/CeO2 Spherical Catalyst Prepared by Impregnation and Washing Processes for Low-Temperature Decomposition of NH3: Characterization and Kinetic Analysis Results

2020 ◽  
Vol 59 (41) ◽  
pp. 18460-18470
Author(s):  
Takeshi Furusawa ◽  
Hiroki Kuribara ◽  
Koji Kimura ◽  
Takafumi Sato ◽  
Naotsugu Itoh
Keyword(s):  
Low Temperature ◽  
Kinetic Analysis ◽  
Temperature Decomposition ◽  
Decomposition Of Nh3 ◽  
Spherical Catalyst

Synergistic effect and mechanism of FeO and CeO co-doping on the superior catalytic performance and SO2 tolerance of Mn-Fe-Ce/ACN catalyst in low-temperature NH3-SCR of NO

2021 ◽  
Vol 9 (6) ◽  
pp. 106360
Author(s):  
Lijun Jiang ◽  
Ya Liang ◽  
Weizao Liu ◽  
Hongli Wu ◽  
Tahani Aldahri ◽  
...  
Keyword(s):  
Low Temperature ◽  
Synergistic Effect ◽  
Catalytic Performance ◽  
Co Doping ◽  
Nh3 Scr ◽  
Scr Of No ◽  
So2 Tolerance

Improved NH3-SCR deNOx activity and tolerance to H2O & SO2 at low temperature over the NbmCu0.1-mCe0.9Ox catalysts: Role of acidity by niobium doping

Fuel ◽  
2021 ◽  
Vol 303 ◽  
pp. 121239
Author(s):  
Zhiping Zhang ◽  
Yingying Li ◽  
Piaoping Yang ◽  
Yushi Li ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Niobium Doping ◽  
Nh3 Scr

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

Unraveling Reactivity Descriptors and Structure Sensitivity in Low-Temperature NH3-SCR Reaction over CeTiOx Catalysts: A Combined Computational and Experimental Study

ACS Catalysis ◽  
2021 ◽  
pp. 7613-7636
Author(s):  
Bing Liu ◽  
Jie Liu ◽  
Lei Xin ◽  
Tao Zhang ◽  
Yuebing Xu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Structure Sensitivity ◽  
Reactivity Descriptors ◽  
Nh3 Scr

CeMn/TiO2 catalysts prepared by different methods for enhanced low-temperature NH3-SCR catalytic performance

2021 ◽  
pp. 116588
Author(s):  
Xianlong Zhang ◽  
Xincheng Zhang ◽  
Xiangjin Yang ◽  
Yazhong Chen ◽  
Xiaorui Hu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Performance ◽  
Nh3 Scr

Low-temperature NH3-SCR activity of M (M = Zr, Ni and Co) doped MnO supported biochar catalysts

2021 ◽  
Vol 9 (6) ◽  
pp. 106504
Author(s):  
Lin Chen ◽  
Shan Ren ◽  
Weizao Liu ◽  
Jie Yang ◽  
Zhichao Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Nh3 Scr ◽  
Co Doped
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