SO<sub>2</sub> Removal from Gas Streams by Ammonia Scrubbing: Process Optimization by Response Surface Methodology

Hashemi, Seyed Mohammad; Mehrabani-Zeinabad, Arjomand; Zare, Mehdi; Shirazian, Saeed

doi:10.1002/ceat.201800352

Cited by 22 publications

(5 citation statements)

References 24 publications

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“…The probability of the occurrence of the results and the probability of measuring the evidence against the null hypothesis are indicated as the P ‐value. A P ‐value <0.05 reveals the importance of the terms of the model and the variation in the response [43]. P‐value >0.05 shows a lack of clear inference for response variation and the insignificance of model terms [39, 44].…”

Section: Resultsmentioning

confidence: 99%

n‐Butane Isomerization over 0.5 Pt/HPA/MCM‐41 Catalyst: Optimization Study Using Central Composite Design

Firouzjaee,

Taghizadeh

2024

Chem Eng & Technol

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In this research, 0.5 % platinum (Pt)/HPAs/MCM‐41 (Mobil Composition of Matter No. 41) bifunctional catalysts (with different weight percentages of phosphotungstic acid (HPW) and silicotungstic acid (HSiW)) were synthesized for use in the n‐butane isomerization. The synthesized catalysts were characterized by X‐ray diffraction, X‐ray fluorescence spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, Brunauer–Emmett–Teller, and ammonia temperature‐programmed desorption analyses. The best catalytic activity and highest initial isobutane yield at 250 °C, weight hourly space velocity of 0.15 h−1, and H2/nC4 molar ratio of 3:1 belonged to 0.5 %Pt/20 % HPW/MCM‐41 (41 %) and 0.5 % Pt/40 % HSiW/MCM‐41 (45 %) samples. Subsequently, the yield of isobutane over these catalysts was evaluated and optimized by a central composite experimental design. According to the quadratic model, the maximum isobutane yield under optimal operating conditions was 34.5 % and 41.36 %, respectively, for 0.5 % Pt/20 % HPW/MCM‐41 and 0.5 % Pt/40 % HSiW/MCM‐41 catalysts.

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Section: Resultsmentioning

confidence: 99%

n‐Butane Isomerization over 0.5 Pt/HPA/MCM‐41 Catalyst: Optimization Study Using Central Composite Design

Firouzjaee,

Taghizadeh

2024

Chem Eng & Technol

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“…Thus, the scaling for the dimensional clogging time 6 is given by setting h d = W , which results in t clog ∼ β s W 2 /λS * D l s , and does not depend on r . We recall from (96), however that the next term in the asymptotic expansion for t clog /RB 3 (and thus, its dimensional equivalent) does depend on the reaction rate.…”

Section: The Physically Relevant Parameter Regimementioning

confidence: 99%

“…Furthermore, it is a highly toxic gas that can cause acid rain and is linked to respiratory illnesses [3,4]. In order to decrease the concentration of sulphur dioxide in flue gas to be released into the atmosphere, various techniques are used, including "gas scrubbing" (both wet and dry) [5][6][7], C. Breward (B)• K. Kiradjiev Mathematical Institute, University of Oxford, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Road, Oxford, OX2 6GG, UK e-mail: breward@maths.ox.ac.uk Fig. 1 Schematic showing the generation of sulphuric acid inside a reactive filter membrane gas absorption [8], packed-bed absorption [9], and reactive filtering using catalysts [10].…”

Section: Introductionmentioning

confidence: 99%

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A simple model for desulphurisation of flue gas using reactive filters

Breward

Kiradjiev

2021

J Eng Math

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Desulphurisation of flue gas is essential before it can be released safely into the atmosphere. One way of removing sulphur dioxide is to use a purification device incorporating a reactive filter, in which the flue gas stream passes in front of a porous-catalyst-filled structure which converts the gaseous sulphur dioxide into liquid sulphuric acid. In this paper, we build and solve a simple mathematical model to describe the operation of a paradigm reactive filter. Our model captures the transport of sulphur dioxide through the device via advection in the main “outer” flow and diffusion through the catalyst structure along with the production of sulphuric acid. This sulphuric acid gradually accumulates in the filter rendering it less efficient. We determine the clogging time for an individual channel (that is, the time at which the entrance to the channel becomes completely filled with liquid) and explore how the concentrations of sulphur dioxide and oxygen and the thickness of the sulphuric acid layer change as the key dimensionless parameters are varied, comparing numerical and asymptotic results where appropriate. We then turn our attention to the device scale and solve our model numerically to determine the overall lifetime of the device. We vary the key dimensionless parameters and explore how they affect the efficiency of the device. In the physically relevant parameter regime, we find an explicit solution to the outer flow problem which agrees well with numerical solutions and provides a formula for the lifetime of the device. Finally, we propose a formula for determining the catalyst reaction rate, given data on the concentration of sulphur dioxide exiting the device.

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“…Therefore, it is highly desirable to develop efficient materials that can selectively remove SO 2 from the source gas mixtures. The existing technologies for SO 2 capture include limestone scrubbing, − ammonia scrubbing, and absorption by organic solvents and ionic liquids. − , However, sulfate byproducts, acidic wastewater, and solvent volatilization and recycling at high temperatures represent serious concerns that still need to be addressed. The use of porous solid adsorbents in capturing toxic gases is a promising method and has been extensively studied over the last two decades.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Porous Organic Polymers for Environmental Remediation of Toxic Gases

Rabbani,

Sasse,

Behera

et al. 2024

Langmuir

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Sulfur dioxide (SO 2 ) is a harmful acidic gas generated from power plants and fossil fuel combustion and represents a significant health risk and threat to the environment. Benzimidazole-linked polymers (BILPs) have emerged as a promising class of porous solid adsorbents for toxic gases because of their chemical and thermal stability as well as the chemical nature of the imidazole moiety. The performance of BILPs in SO 2 capture was examined by synergistic experimental and theoretical studies. BILPs exhibit a significantly high SO 2 uptake of up to 8.5 mmol g −1 at 298 K and 1.0 bar. The density functional theory (DFT) calculations predict that this high SO 2 uptake is due to the dipole−dipole interactions between SO 2 and the functionalized polymer frames through O 2 S(δ + )•••N(δ − )-imine and O�S�O(δ − )•••H(δ + )-aryl and intermolecular attraction between SO 2 molecules (O�S�O(δ − )•••S(δ + )O 2 ). Moderate isosteric heats of adsorption (Q st ≈ 38 kJ mol −1 ) obtained from experimental SO 2 uptake studies are well supported by the DFT calculations (≈40 kJ mol −1 ), which suggests physisorption processes enabling rapid adsorbent regeneration for reuse. Repeated adsorption experiments with almost identical SO 2 uptake confirm the easy regeneration and robustness of BILPs. Moreover, BILPs possess very high SO 2 adsorption selectivity at low concentration over carbon dioxide (CO 2 ), methane (CH 4 ), and nitrogen (N 2 ): SO 2 /CO 2 , 19−24; SO 2 /CH 4 , 118−113; SO 2 /N 2 , 600−674. This study highlights the potential of BILPs in the desulfurization of flue gas or other gas mixtures through capturing trace levels of SO 2 .

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SO₂ Removal from Gas Streams by Ammonia Scrubbing: Process Optimization by Response Surface Methodology

Cited by 22 publications

References 24 publications

n‐Butane Isomerization over 0.5 Pt/HPA/MCM‐41 Catalyst: Optimization Study Using Central Composite Design

n‐Butane Isomerization over 0.5 Pt/HPA/MCM‐41 Catalyst: Optimization Study Using Central Composite Design

A simple model for desulphurisation of flue gas using reactive filters

High-Performance Porous Organic Polymers for Environmental Remediation of Toxic Gases

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SO2 Removal from Gas Streams by Ammonia Scrubbing: Process Optimization by Response Surface Methodology

Cited by 22 publications

References 24 publications

n‐Butane Isomerization over 0.5 Pt/HPA/MCM‐41 Catalyst: Optimization Study Using Central Composite Design

n‐Butane Isomerization over 0.5 Pt/HPA/MCM‐41 Catalyst: Optimization Study Using Central Composite Design

A simple model for desulphurisation of flue gas using reactive filters

High-Performance Porous Organic Polymers for Environmental Remediation of Toxic Gases

Contact Info

Product

Resources

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SO₂ Removal from Gas Streams by Ammonia Scrubbing: Process Optimization by Response Surface Methodology