SOx/NOx Removal from Flue Gas Streams by Solid Adsorbents: A Review of Current Challenges and Future Directions

Rezaei, Fateme; Rownaghi, Ali A.; Monjezi, Saman; Lively, Ryan P.; Jones, Christopher W.

doi:10.1021/acs.energyfuels.5b01286

Cited by 235 publications

(148 citation statements)

References 109 publications

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“…To reduce air pollution resulted from NO x , advances in NO x removal technology have drawn much attention and been quite rapid. NO oxidation plays an increasingly significant role in NO x removal technologies (Bray and Schneider, 2015;Xie et al, 2017), including NO x storage and reduction (Lin et al, 2013;Zhang et al, 2016), selective catalytic reduction (Zahaf et al, 2015;Guo et al, 2017), dry sorbent injection (Rezaei et al, 2015) and absorption in wet flue gas desulfurization (Liu et al, 2014;Guo et al, 2015b). Cerium oxide has been widely utilized in catalysts pleased in these mobile source and stationary source applications, due to its outstanding oxygen storage capacity (OSC) (Atribak et al, 2008;Zhang et al, 2011;Hong et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

NO Adsorption and Oxidation on Mn Doped CeO2 (111) Surfaces: A DFT+U Study

Liu¹,

Zheng²,

Wang³

et al. 2018

Aerosol Air Qual. Res.

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The adsorption of NO molecules on Mn-doped CeO 2 (111) surfaces for NO oxidation has been studied by employing the periodic density functional theory plus U (DFT+U) method. Through our calculations, it is demonstrated how Mn-doped CeO 2 with superior NO oxidation activity benefits from the high mobility of the oxygen near the Mn cations. On unreduced Mn-doped CeO 2 (111) surfaces, the NO molecule preferentially interacted with the first neighboring O of the Mn cation, with the N also bonding to an Mn cation (E ads = -3.30 eV) or Ce cation (E ads = -2.90 eV). When NO adsorbs on the surface of defective Mn-doped CeO 2 with O 2 adsorbed in advance, an ONOO* four atoms species is formed on the surface (E ads = -2.51 eV and -2.02 eV), which is an intermediate and can decompose into NO 2 , NO 2 * and O*. The adsorption structure with higher adsorption energy has a closer geometry to NO 2 , indicating a deeper oxidation of NO. The calculation results indicate that the presence of Mn only has a strong effect on the nearby oxygen atoms and that the Mndoped CeO 2 surface has similar properties to a noble metal in NO oxidation catalysis. In DOS plots, the spin of the electron state of the adsorption structures involving the oxidation of NO is symmetric, indicating that electron transfer occurs from the slab to NO and strong covalent bonds are formed between N and O on the slab, which can also be confirmed by the charge density difference plots.

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Section: Introductionmentioning

confidence: 99%

NO Adsorption and Oxidation on Mn Doped CeO2 (111) Surfaces: A DFT+U Study

Liu¹,

Zheng²,

Wang³

et al. 2018

Aerosol Air Qual. Res.

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“…The combustion of fossil fuels is and will continue to be the main source of energy for many years to come . However, as more fossil fuels are combusted, the amount of greenhouse CO 2 emitted to the atmosphere will continue to increase, thereby leading to global climate change from which we have already started seeing the consequences .…”

Section: Introductionmentioning

confidence: 99%

Effect of Post‐Functionalization Conditions on the Carbon Dioxide Adsorption Properties of Aminosilane‐Grafted Zirconia/Titania/Silica‐Poly(amide‐imide) Composite Hollow Fiber Sorbents

Brennan

Thakkar

et al. 2016

Energy Tech

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In this study, 3‐aminopropyltrimethoxysilane (APS) was used as a grafting agent in three solvents with different polarities for post‐functionalization of a ZrO2–TiO2–SiO2/poly(amide‐imide) composite hollow fiber sorbent (Zr–Ti–Si/PAI‐HF) at ambient temperature. The same fiber at two different states: (i) wet (as‐spun) and (ii) dry were used for amine grafting. The influence of the polarity/nature of various solvents such as acetone, ethanol, and toluene on the CO2 sorption characteristics of wet and dry Zr–Ti–Si/PAI‐HF fibers was investigated accordingly. Several parameters such as grafting time (1–4 h), amine concentration (10–50 wt %), and solvent type (acetone, ethanol, and toluene) were systematically varied. The CO2 sorption capacity and breakthrough tests were performed under simulated flue gas conditions for grafted fiber composites. Our results indicate that the CO2 sorption capacity of amine‐grafted Zr–Ti–Si/PAI‐HF strongly depends on both the type of solvent and the state of the fibers (i.e., dryness or wetness). The APS grafting of wet fibers performed in toluene led to high amine loading and CO2 capacity (1.40 mmol g−1), whereas dry fibers gave rise to a relatively low CO2 capacity (0.90 mmol g−1). In contrast, dry fibers functionalized in either acetone or ethanol exhibited higher CO2 capacity compared to the wet fibers prepared in the same solvent. By using ethanol as a solvent, the solvolysis of the Si−O−Si linkages is much faster than the competitive condensation reaction between the silanol groups (Si−OH) of APS moieties and hydroxyl group (OH) of the ethanol, which leads to the lower siloxane formation. In the case of acetone, a dense polymeric network is formed under condensation reaction between an acetone molecule and the amine moieties, thus reducing the amount of primary amine groups available for interacting with the CO2 molecules.

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“…[5] Zarówno zeolity jak i materiały mezoporowate można otrzymać z popiołów lotnych co zostało potwierdzone w badaniach [6][7][8][9][10][11][12][13][14][15][16][17][18]. Dotychczas w literaturze nie znaleziono badań dotyczących adsorpcji NO 2 na sorbentach stałych tj.…”

Section: Wprowadzenieunclassified

Innowacyjny Sposób Zagospodarowania Popiołów Lotnych

Ściubidło

2016

ZNPRzBiS

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INNOWACYJNY SPOSÓB ZAGOSPODAROWANIA POPIOŁÓW LOTNYCHW artykule przedstawiono badania adsorpcji NO 2 na zeolitach otrzymanych z popiołów lotnych. Celem badań jest określenie parametrów adsorpcji NO 2 na sorbentach stałych i zastosowanie tego procesu w doczyszczaniu spalin z NO 2 . Proponowana przez autorów metoda doczyszczani pozwala nie tylko na doczyszczenie spalin przed utylizacją i składowaniem CO 2 , ale również pozwala na zagospodarowanie odpadów z energetyki z korzyścią dla środowiska poprzez syntezę sorbentów z popiołów lotnych. Na bazie popiołów lotnych zostały otrzymane sorbenty tj. zeolit Na-A i Na-X, które następnie zostały użyte w procesie adsorpcji NO 2 . Zmiennymi parametrami procesu adsorpcji NO 2 była temperatura wygrzewania zeolitów przed procesem adsorpcji oraz stężenie gazu reakcyjnego NO 2 .

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SO_x/NO_x Removal from Flue Gas Streams by Solid Adsorbents: A Review of Current Challenges and Future Directions

Cited by 235 publications

References 109 publications

NO Adsorption and Oxidation on Mn Doped CeO2 (111) Surfaces: A DFT+U Study

NO Adsorption and Oxidation on Mn Doped CeO2 (111) Surfaces: A DFT+U Study

Effect of Post‐Functionalization Conditions on the Carbon Dioxide Adsorption Properties of Aminosilane‐Grafted Zirconia/Titania/Silica‐Poly(amide‐imide) Composite Hollow Fiber Sorbents

Innowacyjny Sposób Zagospodarowania Popiołów Lotnych

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