scholarly journals NO Removal by Plasma-Enhanced NH3-SCR Using Methane as an Assistant Reduction Agent at Low Temperature

2019 ◽  
Vol 9 (13) ◽  
pp. 2751 ◽  
Author(s):  
Weixuan Zhao ◽  
Yanghaichao Liu ◽  
Heng Wei ◽  
Renxi Zhang ◽  
Gang Luo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Reaction System ◽  
Excess Oxygen ◽  
Nox Removal ◽  
No Removal ◽  
Promotion Effect ◽  
Nh3 Scr ◽  
O2 Concentration ◽  
New Process ◽  
Better Than

The effects of using CH4 as an assistant reduction agent in plasma-assisted NH3–SCR were investigated. The new hybrid reaction system performed better than DBD–NH3–SCR when the O2 concentration varied from 2% to 12%. Compared with DBD–NH3–SCR, DBD–NH3–CH4–SCR (NH3:CH4 = 1:1) showed a more significant promotion effect on the performance and N2 selectivity for NOX abatement. When the O2 concentration was 6% and the SIE was 512 J/L, the NO removal efficiency of the new hybrid system reached 84.5%. The outlet gas components were observed via FTIR to reveal the decomposition process and its mechanism. This work indicated that CH4, as an assistant agent, enhances DBD–NH3–SCR in excess oxygen to achieve a new process with significantly higher activity at a low temperature (≤348 K) for NOX removal.

Excellent low-temperature NH3-SCR NO removal performance and enhanced H2O resistance by Ce addition over the Cu0.02Fe0.2CeyTi1-yOx (y = 0.1, 0.2, 0.3) catalysts

Chemosphere ◽  
2020 ◽  
Vol 243 ◽  
pp. 125309 ◽  
Author(s):  
Shibo Ma ◽  
Huansheng Tan ◽  
Yushi Li ◽  
Peiqiang Wang ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Low Temperature ◽  
No Removal ◽  
Nh3 Scr ◽  
Scr No

scholarly journals DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction

Catalysts ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 143 ◽  
Author(s):  
Rui Wu ◽  
Ningqiang Zhang ◽  
Lingcong Li ◽  
Hong He ◽  
Liyun Song ◽  
...  
Keyword(s):  
Low Temperature ◽  
Keggin Structure ◽  
Promotion Effect ◽  
Nh3 Scr

New insight into the promotion effect of Cu doped V2O5/WO3–TiO2 for low temperature NH3-SCR performance

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 35155-35165 ◽  
Author(s):  
Meiqing Shen ◽  
Chenxu Li ◽  
Jianqiang Wang ◽  
Lili Xu ◽  
Wulin Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Promotion Effect ◽  
Reduction Of No ◽  
Temperature Range ◽  
Nh3 Scr ◽  
Insight Into

The promotion effect of Cu on the V/WTi catalyst for the selective catalytic reduction of NOx by NH3 was investigated in the temperature range of 150–400 °C.

scholarly journals Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lin Yang ◽  
Lu Yao ◽  
Yuguo Lai ◽  
Xia Jiang ◽  
Wenju Jiang
Keyword(s):  
Mass Transfer ◽  
Electron Transfer ◽  
Low Temperature ◽  
Active Sites ◽  
Surface Acidity ◽  
Catalytic Performance ◽  
Bridge Structure ◽  
Nox Removal ◽  
No Removal ◽  
Activated Coke

Abstract Activated coke (AC) has great potential in the field of low-temperature NO removal (DeNOx), especially the branch prepared by blending modification. In this study, the AC-based pyrolusite and/or titanium ore blended catalysts were prepared and applied for DeNOx. The results show blending pyrolusite and titanium ore promoted the catalytic performance of AC (Px@AC, Tix@AC) clearly, and the co-blending of two of them showed a synergistic effect. The (P/Ti-1/2)15@AC performed the highest NO conversion of 66.4%, improved 16.9% and 16.0% respectively compared with P15@AC and Ti15@AC. For the (P/Ti-1/2)15@AC DeNOx, its relative better porous structure (SBET = 364 m2/g, Vmic = 0.156 cm3/g) makes better mass transfer and more active sites exposure, stronger surface acidity (C–O, 19.43%; C=O, 4.16%) is more favorable to the NH3 adsorption, and Ti, Mn and Fe formed bridge structure fasted the lactic oxygen recovery and electron transfer. The DeNOx of (P/Ti-1/2)15@AC followed both the E–R and L–H mechanism, both the gaseous and adsorbed NO reacted with the activated NH3 due to the active sites provided by both the carbon and titanium.

A review of Mn-based catalysts for low-temperature NH3-SCR: NOx removal and H2O/SO2 resistance

Nanoscale ◽  
2021 ◽  
Author(s):  
Guiying Xu ◽  
Xiaolong Guo ◽  
Xingxing Cheng ◽  
Jian Yu ◽  
Baizeng Fang
Keyword(s):  
Low Temperature ◽  
High Efficiency ◽  
Nox Removal ◽  
Nh3 Scr ◽  
So2 Resistance

The development of high-efficiency catalysts is the key to the low-temperature NH3-SCR technology. The introduction of SO2 and H2O will lead to poisoning and deactivation of the catalysts, which severely...

PENGGUNAAN AIR SUPER KRITIS PADA DEPOLIMERISASI NYLON-12 (BATCH PROCESS)

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Mohamad Yusman
Keyword(s):  
Supercritical Water ◽  
Scale Up ◽  
Experimental Studies ◽  
Reaction System ◽  
Batch Process ◽  
Chemical Recycling ◽  
Water Decomposition ◽  
Product Distributions ◽  
New Process ◽  
Nylon 12

Water at the supercritical state is a new process for the chemical recycling. At this thermodynamic state i.e. Pc = 218 atmospheres and Tc = 374oC , water behaves very differently from its everyday temperament and it is a very good solvent for organic components. Experimental studies show that supercritical water can decompose hydrocarbons/polymers and produce useful products like 2-Azacyclotridecanone /lactam-1 from Nylon-12 (batch process). The decomposition process itself was carried out in batch reaction system in order to get more information about product distributions, time dependence, and scale-up possibilities.Keywords: supercritical water, decomposition, batch, polymer, hydrocarbon

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.

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