Availability of NH3 adsorption in vanadium-based SCR for reducing NOx emission and NH3 slip

Ko, Ahyun; Woo, Youngmin; Jang, Jinyoung; Jung, Young-Dae; Pyo, Youngdug; Jo, Hyun; Lim, Ocktaeck; Lee, Young Jae

doi:10.1016/j.jiec.2019.05.024

Cited by 38 publications

(14 citation statements)

References 28 publications

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“…NH 3 was employed as a reducing agent to reduce harmful NOx to harmless N 2 and H 2 O under the synergetic action with O 2 . There were three general reactions, which were called standard SCR, fast SCR, and NO 2 SCR reactions [7,32]. The catalyst performance was found to be a dominant factor for the above-mentioned reactions [11,33].…”

Section: Denitration Mechanism and Performancementioning

confidence: 99%

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Chen

et al. 2020

Polymers

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Development of a novel filter material is urgently required for replacing the high-cost flue gas purification technology in the simultaneous removal of both fine dust and Nitrogen oxides (NOx). In this study; polyphenylene sulfide (PPS) needle-punching fibrous felts (NPFF) were employed as the filter material to remove the fine dust; and in the meanwhile; Mn and Ce oxides were loaded onto the PPS NPFF as the catalyst for selective catalytic reduction of NOx with NH3. Two different pretreatment methods; i.e., sodium alginate (SA) deposition and plasma treatment; were employed to modify the PPS NPFF before the traditional impregnation and thermal treatment processes during the catalyst loading. The results showed that these two pretreatment methods both afforded the PPS NPFF with the enhanced loading rate and stability of Mn/Ce oxides compared to those without any pretreatments; which were significantly beneficial for the denitration application. Moreover; we found that both SA deposition and plasma pre-treated samples presented excellent dust-removal properties; and the filtration efficiency could reach 100% when the particle size of the fine particulates was above 4 μm. This study demonstrated that our Mn/Ce oxides decorated PPS NPFF have great potential to be applied in the fuel gas purification field; due to their stable structure; handling convenience; and excellent filtration efficiency; as well as high denitration performance.

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Section: Denitration Mechanism and Performancementioning

confidence: 99%

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Chen

et al. 2020

Polymers

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“…However, when O 2 was fed into the reacting system, R NO decreased rapidly, indicating that the oxidation of NH 3 over circulating ash was motivated in the presence of O 2 . 40 As a result, NO removal was dramatically suppressed. With the continuously increasing O 2 concentration in the feeding gas, R NO increased slightly while it was always negative, which suggested that the catalytic oxidation of NH 3 over circulating ash was still dominant at high O 2 concentrations.…”

Section: Nsrmentioning

confidence: 99%

Experimental Investigation into NO Removal over Circulating Ash in Selective Noncatalytic Reduction during Circulating Fluidized Bed Combustion

Liu

et al. 2020

Ind. Eng. Chem. Res.

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Selective noncatalytic reduction with NH 3 (NH 3 -SNCR) is an important method to control NO emission during circulating fluidized bed (CFB) combustion in which the circulating ash can affect the NO reduction. In this work, the catalytic effects of circulating ash on NH 3 −NO reduction were investigated. The results revealed that the circulating ash suppressed NO removal seriously in NH 3 -SNCR. By increasing the temperatures from 550 to 950 °C, NO reduction was first restrained and then enhanced. O 2 exhibited strong inhibition on the NH 3 −NO reaction over circulating ash. As the normalized stoichiometric ratio of NH 3 /NO increased, the conversion of NO decreased. Fe-and Ca-based species were the primary compounds in the circulating ash that catalytically affected NO reduction. Furthermore, it was determined that the gaseous NH 3 could hardly react with NO adsorbed on the ash surface, and the reactions between NH 3 and NO depended heavily on the formation of NH 2 adsorbed species.

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“…Other denitration methods also have some shortcomings [17][18][19][20][21][22]. For example, the adsorption method also suffers from adsorbent capacity, larger adsorption resistance, and difficult regeneration of the catalyst [17][18][19][20]. The plasma method consumes high energy to achieve ideal oxidation, and the device construction is complex and expensive together with too high maintenance cost [21,22].…”

Section: Introductionmentioning

confidence: 99%

Pilot Plant Evaluation of NO_x Removal by Cobalt Ethylenediamine Solution

et al. 2022

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The removal of NOx by cobalt ethylenediamine solution has attracted much attention, but its reaction mechanism is still not clear. In this study, the reaction mechanism was analyzed experimentally and through practical engineering experiments for thirteen consecutive days. The results indicate that the removal of NOx by cobalt ethylenediamine solution can be divided into two steps. For industrial applications, the removal of actual flue gas NO by cobalt ethylenediamine absorbent was investigated by a gas‐liquid countercurrent and concurrent system in a glass fiber factory in Neijiang, Sichuan province in China, indicating that the average removal efficiency of NO and NOx reached 80 % and that of SO2 90 %.

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Availability of NH3 adsorption in vanadium-based SCR for reducing NOx emission and NH3 slip

Cited by 38 publications

References 28 publications

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Experimental Investigation into NO Removal over Circulating Ash in Selective Noncatalytic Reduction during Circulating Fluidized Bed Combustion

Pilot Plant Evaluation of NO_x Removal by Cobalt Ethylenediamine Solution

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Availability of NH3 adsorption in vanadium-based SCR for reducing NOx emission and NH3 slip

Cited by 38 publications

References 28 publications

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Experimental Investigation into NO Removal over Circulating Ash in Selective Noncatalytic Reduction during Circulating Fluidized Bed Combustion

Pilot Plant Evaluation of NOx Removal by Cobalt Ethylenediamine Solution

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Pilot Plant Evaluation of NO_x Removal by Cobalt Ethylenediamine Solution