Promotion of Non-thermal Plasma on Catalytic Reduction of NOx by C3H8 Over Co/BEA Catalyst at Low Temperature

Pan, Hua; Qiang, Yan

doi:10.1007/s11090-014-9522-8

Cited by 18 publications

(16 citation statements)

References 38 publications

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“…Particularly, the higher the reactor temperature, the more rapid the increase of the NO x conversion rate as the voltage increased. These results show that the plasma affects the catalytic reaction in some way, and similar results have been obtained in many previous studies [21][22][23][24][25][26][27]. In Figure 1c, n-heptane consumptions at different voltages and temperatures are presented.…”

Section: Plasma-coupled Scr Of No Xsupporting

confidence: 89%

“…Although the fact that plasma improves the performance of HC-SCR has been experimentally proven in many studies [16,17,22,27,29], the role of the plasma has not yet been clearly elucidated. …”

Section: Plasma-coupled Scr Of No Xmentioning

confidence: 99%

“…To investigate whether the NOx conversion rate really increases as the NO2 fraction increases, as reported in the literature [16,17,27], catalytic NOx reduction was investigated by gradually increasing the NO2 fraction. Figure 2a shows the NOx conversion according to the NO2 fraction in NOx, and Figure 2b presents the concentrations of unreacted NO and NO2.…”

Section: Effect Of No2 Fraction On the Catalytic Reduction Of Noxmentioning

confidence: 99%

“…However, in the case of HC-SCR, it is not clear why the plasma increases the catalytic reduction performance. Some researchers have interpreted that the formation of NO 2 by the oxidation of NO leads to an enhancement in NO x removal [16,17,27], and others explain the improvement of NO x reduction performance by the production of reactive intermediates from the decomposition of a hydrocarbon-reducing agent by plasma reforming [22,28].…”

Section: Introductionmentioning

confidence: 99%

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Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent

Lee

Kang

et al. 2017

Catalysts

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Abstract:The purpose of this study is to explain how plasma improves the performance of selective catalytic reduction (SCR) of nitrogen oxides (NO x ) with a hydrocarbon reducing agent. In the plasma-coupled SCR process, NO x reduction was performed with n-heptane as a reducing agent over Ag/γ-Al 2 O 3 as a catalyst. We found that the plasma decomposes n-heptane into several oxygen-containing products such as acetaldehyde, propionaldehyde and butyraldehyde, which are more reactive than the parent molecule n-heptane in the SCR process. Separate sets of experiments using acetaldehyde, propionaldehyde and butyraldehyde, one by one, as a reductant in the absence of plasma, have clearly shown that the presence of these partially oxidized compounds greatly enhanced the NO x conversion. The higher the discharge voltage, the more the amounts of such partially oxidized products. The oxidative species produced by the plasma easily converted NO into NO 2 , but the increase of the NO 2 fraction was found to decrease the NO x conversion. Consequently, it can be concluded that the main role of plasma in the SCR process is to produce partially oxidized compounds (aldehydes), having better reducing power. The catalyst-alone NO x removal efficiency with n-heptane at 250 • C was measured to be less than 8%, but it increased to 99% in the presence of acetaldehyde at the same temperature. The NO x removal efficiency with the aldehyde reducing agent was higher as the number of carbons in the aldehyde was more; for example, the NO x removal efficiencies at 200 • C with butyraldehyde, propionaldehyde and acetaldehyde were measured to be 83.5%, 58.0% and 61.5%, respectively, which were far above the value (3%) obtained with n-heptane.

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Section: Plasma-coupled Scr Of No Xsupporting

confidence: 89%

Section: Plasma-coupled Scr Of No Xmentioning

confidence: 99%

Section: Effect Of No2 Fraction On the Catalytic Reduction Of Noxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent

Lee

Kang

et al. 2017

Catalysts

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“…In 1976, Henis patented the idea that NO x can be decomposed by plasma catalysis. Many efforts have been devoted to improving the NO x removal efficiency of the thermal catalytic process by combining NTP with SCR or NSR . The combined adsorption–discharge process for NO x removal has been examined by several groups .…”

Section: Introductionmentioning

confidence: 99%

Non‐thermal plasma‐assisted catalytic oxidation of NO in a dielectric barrier discharge reactor packed with MO_x/Al₂O₃ (M = Mn or Co) as catalysts

Wang

Tang

2019

J of Chemical Tech & Biotech

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BACKGROUND Plasma catalysis has emerged as a powerful tool in converting a gas or gas mixture into other value‐added or environment‐friendly chemicals. However, a substantial research effort is needed to further understand the physical and chemical interactions between plasma and catalysts, and their contribution to the chemical reactions. RESULTS For a given energy density (ED) of 535 ± 25 J L−1, a dielectric barrier discharge (DBD) reactor packed with Al2O3 achieved higher NO2 selectivity and N2O concentration than the DBD reactor alone. Two kinds of supported catalysts (MnOx/Al2O3 and CoOx/Al2O3) with different loading amounts were prepared to investigate the NO oxidation performance of the plasma‐catalytic process. The results indicated that 5 wt% MnOx/Al2O3 presented higher NO2 selectivity and N2O concentration than other catalysts. Packing the DBD reactor with catalysts also changed its discharge behavior. The discharge behavior of the packed‐bed DBD reactor also changed with variation in the loading amount of active metal oxide from 0 to 15 wt%, resulting in changes in NO oxidation performance. Fourier transform infrared (FTIR) and temperature‐programmed desorption (TPD) analysis results indicated that nitrates were formed during the non‐thermal plasma (NTP)‐assisted catalytic process. CONCLUSION Packing catalysts into the NTP area can not only change the discharge behavior but also improve the oxidation performance of NTP. Both NO oxidation performance and N2O formation for the NTP‐assisted catalytic process have presented significant enhancement. Reducing N2O formation will still be a big challenge for NTP systems used in environmental applications. © 2019 Society of Chemical Industry

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Non-thermal Plasma Synergizes High-Alkalinity Hydroxyapatite Supported RhFe Bimetallic Catalyst for Direct Catalytic Decomposition of N2O at Low Temperature

et al. 2023

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Promotion of Non-thermal Plasma on Catalytic Reduction of NOx by C3H8 Over Co/BEA Catalyst at Low Temperature

Cited by 18 publications

References 38 publications

Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent

Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent

Non‐thermal plasma‐assisted catalytic oxidation of NO in a dielectric barrier discharge reactor packed with MO_x/Al₂O₃ (M = Mn or Co) as catalysts

Non-thermal Plasma Synergizes High-Alkalinity Hydroxyapatite Supported RhFe Bimetallic Catalyst for Direct Catalytic Decomposition of N2O at Low Temperature

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Promotion of Non-thermal Plasma on Catalytic Reduction of NOx by C3H8 Over Co/BEA Catalyst at Low Temperature

Cited by 18 publications

References 38 publications

Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent

Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent

Non‐thermal plasma‐assisted catalytic oxidation of NO in a dielectric barrier discharge reactor packed with MOx/Al2O3 (M = Mn or Co) as catalysts

Non-thermal Plasma Synergizes High-Alkalinity Hydroxyapatite Supported RhFe Bimetallic Catalyst for Direct Catalytic Decomposition of N2O at Low Temperature

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Non‐thermal plasma‐assisted catalytic oxidation of NO in a dielectric barrier discharge reactor packed with MO_x/Al₂O₃ (M = Mn or Co) as catalysts