The effects of tungsten and hydrothermal aging in promoting NH3-SCR activity on V2O5/WO3-TiO2 catalysts

2018 ◽  
Vol 459 ◽  
pp. 639-646 ◽  
Author(s):  
Hongfeng Chen ◽  
Yang Xia ◽  
Ruyi Fang ◽  
Hui Huang ◽  
Yongping Gan ◽  
...  
Keyword(s):  
Hydrothermal Aging ◽  
Nh3 Scr

Hydrothermal aging alleviates the inhibition effects of NO2 on Cu-SSZ-13 for NH3-SCR

2020 ◽  
Vol 275 ◽  
pp. 119105 ◽  
Author(s):  
Yulong Shan ◽  
Yu Sun ◽  
Jinpeng Du ◽  
Yan Zhang ◽  
Xiaoyan Shi ◽  
...  
Keyword(s):  
Hydrothermal Aging ◽  
Nh3 Scr

Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

2019 ◽  
Vol 4 (6) ◽  
pp. 1050-1058 ◽  
Author(s):  
Taekyung Ryu ◽  
Yonjoo Kang ◽  
In-Sik Nam ◽  
Suk Bong Hong
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Aging ◽  
Reduction Of No ◽  
Nh3 Scr ◽  
Scr Catalysts ◽  
High Silica

Iron-exchanged high-silica LTA zeolites exhibit high activity for selective catalytic reduction of NOx by NH3, even after hydrothermal aging at 900 °C.

A comparison of hydrothermal aging effects on NH3-SCR of NO over Cu-SSZ-13 and Cu-SAPO-34 catalysts

2015 ◽  
Vol 165 ◽  
pp. 438-445 ◽  
Author(s):  
Di Wang ◽  
Yasser Jangjou ◽  
Yong Liu ◽  
Munish K. Sharma ◽  
Jinyong Luo ◽  
...  
Keyword(s):  
Aging Effects ◽  
Hydrothermal Aging ◽  
Nh3 Scr ◽  
Scr Of No

Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH3-SCR Applications

2013 ◽  
Vol 56 (1-8) ◽  
pp. 317-322 ◽  
Author(s):  
Norman Wilken ◽  
Radka Nedyalkova ◽  
Krishna Kamasamudram ◽  
Junhui Li ◽  
Neal W. Currier ◽  
...  
Keyword(s):  
Hydrothermal Aging ◽  
Nh3 Scr

Investigation on the stability of copper modification of SAPO-34 catalysts in NH3-SCR reaction after hydrothermal aging

2020 ◽  
Vol 98 (5) ◽  
pp. 236-243
Author(s):  
Xiaoxin Wu ◽  
Jiaxi Peng ◽  
Shaoming Yang ◽  
Wenyuan Xu
Keyword(s):  
Ion Exchange ◽  
Copper Oxide ◽  
Structural Stability ◽  
Solid State Nmr ◽  
Impregnation Method ◽  
Hydrothermal Aging ◽  
Exchange Method ◽  
Nh3 Scr ◽  
Ion Exchange Method ◽  
The Stability

The influence of hydrothermal aging on the structural stability of Cu-modified SAPO-34 prepared by ion-exchange and impregnation methods was studied. XRD, Ar adsorption at −196 °C, solid-state NMR, UV–vis, H2-TPR, and EPR were used to probe the structural properties of the catalysts. It was found that the precipitation of crystalline AlPO4 and SiO2, the appearance of mesopores, the migration of silicon to form siliceous islands, and the formation of copper oxide crystallites occurred in aged catalysts. Furthermore, more siliceous islands and copper oxide crystallites were present in the aged samples prepared by the impregnation method than in those prepared by the ion-exchange method. Therefore, the impregnated catalysts show a much poorer structural stability than the ion-exchanged catalysts, which leads to more serious deterioration in the NH3-SCR reaction after hydrothermal aging.

scholarly journals Deactivation and Regeneration for the SO2-Poisoning of a Cu-SSZ-13 Catalyst in the NH3-SCR Reaction

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 797 ◽  
Author(s):  
Yan Wang ◽  
Zhaoqiang Li ◽  
Rongrong Fan ◽  
Xin Guo ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Active Sites ◽  
Sulfur Poisoning ◽  
Photoelectron Spectra ◽  
Hydrothermal Aging ◽  
Exponential Factor ◽  
Nh3 Scr ◽  
So2 Poisoning ◽  
Scr Catalysts ◽  
Temperature Programmed ◽  
Redox Ability

Cu-SSZ-13 has been generally considered as the predominant commercial selective catalytic reduction (SCR) catalyst in the NH3-SCR reaction because of its superior activity and durability. However, in real applications, SCR catalysts readily undergo hydrothermal aging and sulfur poisoning. In this work, the deactivation and regeneration of a commercial Cu-SSZ-13 catalyst was investigated for SO2 exposures during hydrothermal aging and the effect of different regeneration temperatures was compared. By using XRD, SEM, H2-temperature programmed reduction (TPR), X–ray photoelectron spectra (XPS) and NH3-temperature programmed desorption (TPD) analysis, it was found that SO2 poisoning influenced the chabazite (CHA) structure even if regeneration cannot restore its original structure, the redox ability and ammonia storage performance also influenced by sulfation and the regeneration process. Moreover, the extent of a decrease in redox ability was more severe than acidity, suggesting that the amount of isolated Cu2+ and Cu+ reduction was responsible for irreversible deactivation over the Cu-SSZ-13 catalyst. Combined with the analysis of Ea values and pre-exponential factor of the SCR reaction, a more likely explanation for the irreversible deactivation was that active sites were lost mostly in sulfated and regenerated process sites.

Corrigendum to “Effects of hydrothermal aging on NH3-SCR reaction over Cu/zeolites” [J. Catal. 287 (2012) 203–209]

2012 ◽  
Vol 289 ◽  
pp. 272 ◽  
Author(s):  
Ja Hun Kwak ◽  
Diana Tran ◽  
Sarah D. Burton ◽  
János Szanyi ◽  
Jong H. Lee ◽  
...  
Keyword(s):  
Hydrothermal Aging ◽  
Nh3 Scr

Global kinetic modeling of hydrothermal aging of NH3-SCR over Cu-zeolites

2015 ◽  
Vol 163 ◽  
pp. 382-392 ◽  
Author(s):  
Supriyanto ◽  
Kurnia Wijayanti ◽  
Ashok Kumar ◽  
Saurabh Joshi ◽  
Krishna Kamasamudram ◽  
...  
Keyword(s):  
Kinetic Modeling ◽  
Hydrothermal Aging ◽  
Nh3 Scr

Unexpected increase in low-temperature NH3-SCR catalytic activity over Cu-SSZ-39 after hydrothermal aging

2021 ◽  
Vol 294 ◽  
pp. 120237
Author(s):  
Jinpeng Du ◽  
Yulong Shan ◽  
Yu Sun ◽  
Meng Gao ◽  
Zhongqi Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Hydrothermal Aging ◽  
Nh3 Scr
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