Study on the Macro‐Kinetics of NO Advanced Oxidation Removal by Decomposition of Gas‐Phase H2O2 over γ‐Fe2O3@Fe3O4

Yang, Siyuan; He, Shanshan

doi:10.1002/slct.201901142

Cited by 6 publications

(5 citation statements)

References 41 publications

(40 reference statements)

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“…After absorption, it was found from peak area calculation that the content of Fe(II) decreased from 39.8% to 16.6% and the percent of Fe(III) increased from 35.4% to 52.8%. The results confirmed that a redox reaction occurred on the catalyst 49 …”

Section: Resultssupporting

confidence: 72%

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Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Liu

Zhou

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: How to control NO x emission in flue gas economically and efficiently is the focus in the field of energy and environment in the world. In this work, Fe 3 O 4 -magnetic microspheres were employed as the matrix with loading FeEDTA (where EDTA is ethylenediaminetetraacetic acid) to prepare magnetic denitrification absorbent Fe 3 O 4 @FeEDTA. The performance of nitric oxide (NO) removal using Fe 3 O 4 @FeEDTA dispersed in H 2 O 2 solution with ultraviolet (UV) was first investigated. RESULTS:The results showed that Fe 3 O 4 @FeEDTA could be used as a good catalytic oxidation denitrification agent. Increasing H 2 O 2 concentration and O 2 concentration could promote NO absorption. NO removal efficiency increased as pH value increased from 1.5 to 3.0, then decreased when pH continued to increase. The elevated temperature was conducive to NO removal. CO 2 hardly affected the removal of NO, while SO 2 with high concentration was not conducive to NO absorption. In addition, the NO removal mechanism was preliminarily analyzed with X-ray photoelectron spectrometry, electron spin resonance and ion chromatography. The mechanism study indicated that NO removal by Fe 3 O 4 @FeEDTA/H 2 O 2 was a catalysis-complexation-oxidation-absorption process, in which •OH was determined to be the main oxidizing species, and NO captured by Fe(II)EDTA was mainly oxidized by •OH to NO 3 − . CONCLUSION: The catalytic activity of Fe 3 O 4 @FeEDTA could maintain stability during the repeat experiment, realizing the recycling and reuse of Fe 3 O 4 @FeEDTA. The UV-Fe 3 O 4 @FeEDTA-activated H 2 O 2 advanced oxidation technology is suitable for wet denitrification.

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Section: Resultssupporting

confidence: 72%

“…The results confirmed that a redox reaction occurred on the catalyst. 49 For O1s spectra (Fig. 9(b)), the characteristic peaks in the O1s spectrum appeared at 529.8-530.0 and 531.1-531.4 eV, corresponding to the lattice oxygen (Fe O) and adsorbed oxygen (OH , COOH ) of the catalyst, respectively.…”

Section: Reaction Mechanismmentioning

confidence: 99%

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Liu

Zhou

et al. 2023

J of Chemical Tech & Biotech

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“…Rod‐like colloids are very interesting systems and are known for their ability to form fascinating liquid‐crystal and plastic‐crystal phases . These mesophases are the colloidal analogues of molecular liquid crystals or plastic crystals.…”

Section: Figurementioning

confidence: 99%

Metastable Self‐Assembly of Theta‐Shaped Colloids and Twinning of Their Crystal Phases

Wang

Liu

2019

Angewandte Chemie

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Anisotropic colloids self‐assemble into different crystal structures compared to spherical colloids. Exploring and understanding their self‐assembly behavior could lead to creation of new materials with hierarchical structures through a bottom‐up process. Herein, we report metastable self‐assembly of theta‐shaped SiO2 colloids interacting with a depletion force in a quasi‐two‐dimensional space and we demonstrate that both a metastable “prone” crystal phase and a stable “standing” crystal phase can be formed, depending on the self‐assembly path. Path selection stems from an interplay between particle–particle interactions and particle–wall interactions. In particular, a twinning of the metastable crystals was observed and two twinning mirror axes were found. A variety of complex twinned crystals were formed by each individual mirror axis or their combinations.

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“…[8] Thus, the Fenton-like reaction with * OH radicals from H 2 O 2 decomposition over heterogeneous catalysts would be effective and feasible for NO-oxidation. [9] Hematite, [10] hematite doped alumina, [11] zero-valent iron, [12] ferric sulfate, [7] Y-Fe 2 O 3 @Fe 3 O 4 , [13] Fe 2.5 M 0.5 O 4 [14] and Fe 2 (MoO 4 ) 3 [15] have been developed for denitrification by catalytic H 2 O 2 -producing * OH radicals, and the high NO-removal conversions were observed. However, for those catalysts, the relative low surface area might impose low utilization of active sites.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Decomposition of H₂O₂ for NO Oxidation‐Removal over Hierarchical Fe‐ZSM‐5: Effect of Ethanol on Zeolite Performance

et al. 2022

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Hierarchical Fe-ZSM-5 zeolite catalysts hydrothermally prepared using tetrapropylammonium hydroxide (TPAOH) and [3-(trimethoxysilyl)propyl]octadecyldimethylammonium chloride (TPOAC) as micropore structure-directing agent and mesoporogen, respectively, were investigated for oxidation-removal of NO via catalytic decomposition of gas-phase H 2 O 2 into hydroxyl free radicals ( * OH). The effects of ethanol in synthesis gel on the structure, porosity, Fe species state, and catalytic performance of zeolite catalysts were explored. And the function mechanism of ethanol was speculated. Appropriate ethanol dosage in synthesis gel probably stabilized TPOAC micelles during MFI crystallization, facilitated mesopores inte-gration in zeolite crystals, benefited oxygen vacancy formation, accelerated * OH radicals generation, and thereby enhanced NO oxidation-removal efficiency. The hierarchical Fe-ZSM-5 prepared with ethanol/H 2 O ratio of 1 in synthesis gel displayed an excellent catalytic activity with the optimal NO conversion up to 35.9 % enhancement compared to the microporous Fe-ZSM-5. The SO 2 resistance and * OH scavenger test during catalytic reaction, as well as the reaction condition influence on the catalytic performance of hierarchical Fe-ZSM-5 were explored, and then the oxidation-removal mechanism of NO over hierarchical Fe-ZSM-5 was preliminarily proposed.

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Study on the Macro‐Kinetics of NO Advanced Oxidation Removal by Decomposition of Gas‐Phase H₂O₂ over γ‐Fe₂O₃@Fe₃O₄

Cited by 6 publications

References 41 publications

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Metastable Self‐Assembly of Theta‐Shaped Colloids and Twinning of Their Crystal Phases

Catalytic Decomposition of H₂O₂ for NO Oxidation‐Removal over Hierarchical Fe‐ZSM‐5: Effect of Ethanol on Zeolite Performance

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Study on the Macro‐Kinetics of NO Advanced Oxidation Removal by Decomposition of Gas‐Phase H2O2 over γ‐Fe2O3@Fe3O4

Cited by 6 publications

References 41 publications

Effective nitric oxide removal from flue gas using UV/H2O2 solution catalyzed by Fe3O4@FeEDTA

Effective nitric oxide removal from flue gas using UV/H2O2 solution catalyzed by Fe3O4@FeEDTA

Metastable Self‐Assembly of Theta‐Shaped Colloids and Twinning of Their Crystal Phases

Catalytic Decomposition of H2O2 for NO Oxidation‐Removal over Hierarchical Fe‐ZSM‐5: Effect of Ethanol on Zeolite Performance

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Study on the Macro‐Kinetics of NO Advanced Oxidation Removal by Decomposition of Gas‐Phase H₂O₂ over γ‐Fe₂O₃@Fe₃O₄

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Catalytic Decomposition of H₂O₂ for NO Oxidation‐Removal over Hierarchical Fe‐ZSM‐5: Effect of Ethanol on Zeolite Performance