Study on active coke‐based adsorbents for <scp>SO<sub>2</sub></scp> removal in flue gas

Zuo, Yanran; Yi, Honghong; Tang, Xiaolong; Zhao, Shunzheng; Zhang, Bowen; Wang, Zhixiang; Gao, Feifei

doi:10.1002/jctb.4499

Cited by 11 publications

(6 citation statements)

References 30 publications

(47 reference statements)

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“…In our previous researches, alkali (especially KOH) has shown a good enhancement effect on the adsorption of adsorbent and the catalytic oxidation of catalyst . Therefore, the CSAC adsorbent was first pretreated by KOH with different mass fraction.…”

Section: Resultsmentioning

confidence: 99%

“…Lee et al found that the K element has a strong interaction effect on the surface of γ-AL 2 O 3 that being conducive to the NO x adsorption. In our previous research, we found that alkali species (especially KOH) being an additional active component metal had a good enhancement effect on the adsorption of adsorbent. Nikolov et al studied the adsorption of NO on transition metal Cu modified activated carbon under the condition of room temperature and found that the addition of Cu significantly improved the adsorption of NO on activated carbon.…”

Section: Introductionmentioning

confidence: 94%

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NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature

Gao

Tang

et al. 2018

Ind. Eng. Chem. Res.

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In this study, coconutshell-, coal-, and wood-based activated carbon were selected as the adsorbents for NO adsorption. KOH and transition metal oxides (CuO, FeOx, and NiO) were further adopted to improve the NO removal efficiency and adsorption capacity at ambient temperature. The results showed that CSAC-KOH(3)-NiO(10) adsorbents (coconut shell based activated carbon modified by 3% KOH and then 10% NiO) achieved the highest removal efficiency of NO (above 95.6%) and adsorption capacity (5.26 mg/g) within 60 min. XPS and NO-TPD results indicated that the increase of −C–O and OH–/O x – species might be the reasons for good removal efficiency of NO over CSAC-KOH, while the increase of OH-/O x – and lattice oxygen (O2– in Ni–O) species is the reason for the CSAC-KOH-NiO sample. The medium sites of the active adsorbed oxygen (O x –) species and strong sites of lattice oxygen are the major adsorption sites on the surface of CSAC-KOH-NiO. The possible NO adsorption process were proposed that the main nitrite species (−NO2) might be generated by lattice oxygen (O2–) in Ni–O sites with the stimulation effects of active oxygen (O x – or/and [O]), while NO– and – NO3 species were generated from −CC, −CC, and −CO sites.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature

Gao

Tang

et al. 2018

Ind. Eng. Chem. Res.

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“…The surface functional groups of activated coke can be enriched by HNO 3 treatment, which favors the adsorption of SO 2 . The relative content of oxygen‐containing functional group is increased by HNO 3 , which can play a favorable role in their improved SO 2 adsorption abilities …”

Section: Resultsmentioning

confidence: 99%

“…14 The relative content of oxygen-containing functional group is increased by HNO 3 , which can play a favorable role in their improved SO 2 adsorption abilities. 15 In summary, NAC-800 was selected for adsorption-thermal regeneration cycling to explore its thermal regeneration performance. The coke after desulfurization was denoted as NAC-800-S.…”

Section: Comparison Of the Desulfurization Performance Of The Preparementioning

confidence: 99%

Study of the properties of adsorption of SO₂ – thermal regeneration cycle of activated coke modified by oxidization

Cui

Tang

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND In order to clarify the effect of thermal regeneration on the desulfurization performance of activated coke, consecutive adsorption of SO2–thermal regeneration cycle experiments were carried out under different thermal conditions in this study. RESULTS Results showed that the decrease in breakthrough sulfur capacity was not very significant for the cokes except for the first regeneration cycles. From 400–600 °C, the higher the regeneration temperature was, the better the desulfurization activity of the cokes after regeneration. Various means (FT‐IR, BET, XPS, TGA, SEM and in situ DRIFTS) were used to characterize samples. The results indicated that the desulfurization products were divided into physisorbed SO2, H2SO4 and sulfate. The phenolic hydroxyl and carboxyl groups on the surface of activated cokes promoted the removal of SO2. CONCLUSION The deposition of sulfate resulted in a significant decrease in the sulfur capacity of activated coke after the first two regeneration cycles. However, the residual amount of sulfate on the activated coke after regeneration declined with increasing regeneration temperature. Moreover, the phenolic hydroxyl and carboxyl groups did not disappear after regeneration, resulting in the desulfurization activity of cokes remaining relatively stable during subsequent desulfurization cycles. © 2017 Society of Chemical Industry

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“…As a result, a large number of polluting gases are released, leading to deterioration of air quality and endangering people’s health. 9 Therefore, it is particularly important to find an efficient adsorbent for polluting gases. Activated coke is a material with a developed pore structure, strong selective adsorption capacity, large specific surface area, and easy regeneration performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Activation Conditions on the Properties of Sludge-Based Activated Coke

Wang

Li²,

Hao

et al. 2021

ACS Omega

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Sewage sludge and waste biomass are unavoidable byproducts of municipal and industrial processes. Both materials have significant carbon contents. Activated coke with a developed pore structure can be obtained after its physical activation. In this study, sewage sludge and waste poplar bark were used as precursor materials to prepare activated coke by steam, carbon dioxide gas, and their mixtures. The effects of different concentrations of activation gas on the activated coke product were investigated. Through nitrogen adsorption analysis, it was found that activated coke has a higher specific surface area and better pore structure when activated in gas containing 20% steam. The activated coke prepared by carbon dioxide gas activation has higher microporosity than that prepared by steam activation. Infrared spectrum analysis shows that steam activation is beneficial to the formation of free hydroxyl functional groups. Through scanning electron microscopy analysis, the pores of activated coke prepared by steam activation appeared to extend deeper in the structure of the coke, while the pores of activated coke prepared by carbon dioxide activation appeared to have fine circular structures. The activated coke prepared by the activation of mixed gas appeared to have ablated particles on the surface due to the ablation of the pore structure. In order to prepare activated coke with excellent adsorption performance, the physical and chemical properties of activated coke under different activation conditions were studied in detail.

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Study on active coke‐based adsorbents for SO₂ removal in flue gas

Abstract: BACKGROUND: A series of active coke-based adsorbents from different sources, treated with acid-base, modified by metal compounds and calcined at different temperatures were investigated for SO 2 removal from flue gas.

Cited by 11 publications

References 30 publications

NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature

NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature

Study of the properties of adsorption of SO₂ – thermal regeneration cycle of activated coke modified by oxidization

Effects of Activation Conditions on the Properties of Sludge-Based Activated Coke

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Study on active coke‐based adsorbents for SO2 removal in flue gas

Abstract: BACKGROUND: A series of active coke-based adsorbents from different sources, treated with acid-base, modified by metal compounds and calcined at different temperatures were investigated for SO 2 removal from flue gas.

Cited by 11 publications

References 30 publications

NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature

NiO-Modified Coconut Shell Based Activated Carbon Pretreated with KOH for the High-Efficiency Adsorption of NO at Ambient Temperature

Study of the properties of adsorption of SO2 – thermal regeneration cycle of activated coke modified by oxidization

Effects of Activation Conditions on the Properties of Sludge-Based Activated Coke

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Study on active coke‐based adsorbents for SO₂ removal in flue gas

Study of the properties of adsorption of SO₂ – thermal regeneration cycle of activated coke modified by oxidization