Improvement in alkali metal resistance of commercial V2O5–WO3/TiO2 SCR catalysts modified by Ce and Cu

2019 ◽  
Vol 54 (24) ◽  
pp. 14707-14719 ◽  
Author(s):  
Huirong Li ◽  
Jifa Miao ◽  
Qingfa Su ◽  
Yanke Yu ◽  
Yanting Chen ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Resistance ◽  
Scr Catalysts

Insights into high CO-SCR performance of CuCoAlO catalysts derived from LDH/MOFs composites and study of H2O/SO2 and alkali metal resistance

2021 ◽  
Vol 426 ◽  
pp. 131873
Author(s):  
Yu Zhang ◽  
Ling Zhao ◽  
Mengdi Kang ◽  
Ziang Chen ◽  
Shengjun Gao ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Resistance

Enhanced activity and alkali metal resistance for vanadium SCR catalyst by co-modification with Mo and Sb

2021 ◽  
Author(s):  
Peng Wu ◽  
Kai Shen ◽  
Yiliang Liu ◽  
Yaping Zhang ◽  
Guobo Li ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Wide Temperature Range ◽  
Metal Resistance ◽  
Scr Catalyst ◽  
Temperature Range ◽  
Tio2 Catalyst ◽  
Enhanced Activity

Series of V0.04W0.03MoxSby/TiO2 catalysts were prepared by impregnating various content of Mo and Sb. The preferred V0.04W0.03Mo0.015Sb0.018/TiO2 catalyst exhibited better SCR activity at a wide temperature range of 160-320 °C,...

scholarly journals The Poisoning of V2O5-WO3/TiO2 and V2O5-Ce(SO4)2/TiO2 SCR Catalysts by KCl and The Partial Regeneration by SO2

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 207 ◽  
Author(s):  
Hua Nie ◽  
Wei Li ◽  
Qirong Wu ◽  
Vladislav Rac ◽  
Vesna Rakić ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Alkali Metal ◽  
Low Temperatures ◽  
Catalyst Surface ◽  
Alkali Metal Chlorides ◽  
Metal Chlorides ◽  
Scr Catalyst ◽  
Scr Catalysts ◽  
Vanadium Based Catalysts ◽  
Better Than

Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2 and V2O5-Ce(SO4)2/TiO2, was investigated. The catalytic activity of the fresh V2O5-WO3/TiO2 was higher than that of V2O5-Ce(SO4)2/TiO2 at low temperatures. V2O5-Ce(SO4)2/TiO2 performed better than V2O5-WO3/TiO2 when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO2 treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO2.

scholarly journals Improvement of Alkali Metal Resistance for NH3-SCR Catalyst Cu/SSZ-13: Tune the Crystal Size

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 979
Author(s):  
Zexiang Chen ◽  
Meiqing Shen ◽  
Chen Wang ◽  
Jianqiang Wang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Crystal Size ◽  
Catalytic Reduction ◽  
Side Reaction ◽  
Physical Structure ◽  
Metal Resistance ◽  
Structure Characterization ◽  
Simple Method ◽  
Nh3 Scr ◽  
Nh3 Oxidation

To improve the alkali metal resistance of commercial catalyst Cu/SSZ-13 for ammonia selective catalytic reduction (NH3-SCR) reaction, a simple method to synthesize Cu/SSZ-13 with a core–shell like structure was developed. Compared with smaller-sized counterparts, Cu/SSZ-13 with a crystal size of 2.3 μm exhibited excellent resistance to Na poisoning. To reveal the influence of the crystal size on Cu/SSZ-13, physical structure characterization (XRD, BET, SEM, NMR) and chemical acidic distribution (H2-TPR, UV-Vis, Diethylamine-TPD, pyridine-DRIFTs, EDS) were investigated. It was found that the larger the crystal size of the molecular sieve, the more Cu is distributed in the crystal core, and the less likely it was to be replaced by Na to generate CuO. Therefore, a 2.3 μm sized Cu/SSZ-13 well-controlled the reactivity of the side reaction NH3 oxidation and the generation of N2O. The result was helpful to guide the extension of the service life of Cu/SSZ-13.

Effect of Operation Conditions on Activity of De-NOx SCR Catalysts before and after Poisoned by Alkali Metal

2014 ◽  
Vol 955-959 ◽  
pp. 702-705
Author(s):  
Xiao Qi Liu ◽  
Chang An Wang ◽  
Yong Bo Du ◽  
Qiang Lv ◽  
Yong Gang Zhao ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Residence Time ◽  
No Reduction ◽  
Reduction Ratio ◽  
Impregnation Method ◽  
Operation Conditions ◽  
Scr Catalysts ◽  
Before And After ◽  
Zhundong Coal ◽  
Apparent Influence

Zhundong coal has a huge proved reserve and many excellent properties. However, the alkali metal content in Zhundong coal is distinctly high, which can accelerate the deactivation of De-NOx SCR catalysts. Using solution impregnation method, the effect of operation conditions on activity of SCR catalysts before and after poisoned by sodium was experimentally investigated. The results show that the NO reduction ratio raises with the increase of NH3/NO ratio. Longer residence time results in higher NO reduction ratio. Compared with catalyst poisoned by NaCl, residence time presents less influence on activity of fresh catalyst in 250-400 oC, which is beneficial for De-NOx process. Both O2 and NO concentration have no apparent influence on NO reduction ratio.

The role of alkali metal ions on hydrothermal stability of Cu/SSZ-13 NH3-SCR catalysts

2020 ◽  
Vol 355 ◽  
pp. 482-492 ◽  
Author(s):  
Chen Wang ◽  
Wenjun Yan ◽  
Zhixin Wang ◽  
Zexiang Chen ◽  
Jianqiang Wang ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Hydrothermal Stability ◽  
Alkali Metal Ions ◽  
Nh3 Scr ◽  
Scr Catalysts

scholarly journals Highly dispersed Cu y AlO x mixed oxides as superior low-temperature alkali metal and SO 2 resistant NH 3 -SCR catalysts

2017 ◽  
Vol 538 ◽  
pp. 37-50 ◽  
Author(s):  
Qinghua Yan ◽  
Yu Nie ◽  
Ruoyan Yang ◽  
Yuhan Cui ◽  
Dermot O’Hare ◽  
...  
Keyword(s):  
Low Temperature ◽  
Alkali Metal ◽  
Mixed Oxides ◽  
Scr Catalysts ◽  
Highly Dispersed

Effect of Alkali Metal Deposition on Activity of De-NOx SCR Catalysts

2014 ◽  
Vol 955-959 ◽  
pp. 698-701
Author(s):  
Pei Qing Cao ◽  
Chang An Wang ◽  
Zhi Qiang Liu ◽  
Yong Bo Du ◽  
Yong Gang Zhao ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Content ◽  
Catalytic Effect ◽  
No Reduction ◽  
Metal Deposition ◽  
Impregnation Method ◽  
Scr Catalyst ◽  
Scr Catalysts ◽  
Zhundong Coal ◽  
Sodium And Potassium

Zhundong coal has a huge proved reserve and many excellent properties. However, the alkali metal content in Zhundong coal is apparently high, which can accelerate the deactivation of De-NOx SCR catalysts. In the present study, the effect of alkali metal deposition on activity of SCR catalysts through solution impregnation method was experimentally investigated. The results indicate that alkali metal deposition on the catalyst surface significantly deactivates the capacity of SCR catalysts. NaOH presents the most intense poisonousness. The catalytic effect on NO reduction reduces with the increase of alkali metal content on catalyst surfaces. In addition, potassium establishes more obvious poisonousness on SCR catalyst than sodium. There is interaction effect between sodium and potassium on deactivating the SCR catalyst.

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