Multicycle CO2 capture activity and fluidizability of Al-based synthesized CaO sorbents

Azimi, Babak; Tahmasebpoor, Maryam; Jiménez, Pilar; Valverde, José Manuel

doi:10.1016/j.cej.2018.10.061

Cited by 104 publications

(30 citation statements)

References 69 publications

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“…(b) and (c), a shift to the highest binding energy of Ca 2p and O 1s in C‐Mn‐CaO was found, which was not observed in the original CaO. It means that it was easier for the Ca atom and O atom in C‐Mn‐CaO to give electrons to CO 2 than the original CaO, which assisted the fast formation of CO 3 . The doping of Mn in CaO was beneficial to the electron transport from CaO to CO 2 , which accelerated the carbonation rates of CaO.…”

Section: Resultsmentioning

confidence: 93%

“…Doping additives into calcium‐based sorbents is an effective and economical method to improve their CO 2 capture capacities . Some metal oxides like Al 2 O 3 20–23 , La 2 O 3 23 and MgO with high sintering resistance can provide stable frameworks and enhance the sintering resistance of CaO during multiple carbonation / calcination cycles.…”

Section: Introductionmentioning

confidence: 99%

“…Doping tiny amounts of additives to enhance CO 2 capture performances of calcium‐based sorbents is very attractive. Previous research has shown that doping tiny amounts of additives such as HBr, Na 2 CO 3 , MnO 2 , and KMnO 4 31 can enhance CO 2 capture capacities of calcium‐based sorbents effectively. Chen et al .…”

Section: Introductionmentioning

confidence: 99%

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A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Wan

et al. 2019

Greenhouse Gases

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Novel Mn‐doped CaO was prepared by the combustion method. The CO2 capture performance of Mn‐doped CaO, carbonated in the presence of steam and under severe calcination conditions (950°C and 70% CO2/30% N2) during calcium looping cycles, was investigated in a dual fixed‐bed reactor. The intercoupling effects of Mn and steam on CO2 capture by CaO were also studied. Doping of Mn in CaO by the combustion method greatly improved the CO2 capture capacity of CaO. The carbonation conversions of Mn‐doped CaO increased with increasing steam concentration from 0 to 15%. When the molar ratio of Mn/Ca was 0.75 : 100, Mn‐doped CaO achieved the highest CO2 capture capacity. Under severe calcination conditions, the carbonation conversion of Mn‐doped CaO, where the molar ratio of Mn to Ca = 0.75 : 100 in the presence of 15% steam, was about 0.4 after ten cycles (carbonation for 5 min at 650°C under 15% CO2/15% steam/N2), which was 4.38 times as high as that of the original CaO in the absence of steam. The cyclic CO2 capture capacities of CaO were improved by Mn and steam. Synergistic enhancement effects of Mn and steam on the CO2 capture capacities of CaO were also found. The effect of steam on the carbonation conversion of Mn‐doped CaO was stronger than that of the original CaO. Mn in the presence of steam showed a more positive effect on CO2 capture by CaO. X‐ray photoelectron spectroscopy analysis showed that doping of Mn in CaO enhanced the transport of electrons in the carbonation of CaO, which helped to increase the carbonation rate. When steam was present in the carbonation, Mn‐doped CaO possessed a more porous structure and smaller CaO grains than the original CaO during the cycles. Simulation calculations using periodic density functional theory (DFT) showed that CO2 molecules were easier to absorb on CaO owing to the doping of Mn and the presence of steam. The synergistic enhancement effects of Mn and steam on CO2 captured the performance of CaO. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Wan

et al. 2019

Greenhouse Gases

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“…An alternative to commonly used techniques is sorption of ammonia on a properly selected sorbent. The sorbent should meet a number of requirements: be easily accessible and durable both mechanically and chemically, have high sorption capacity and high affinity for analyte, and enable recycling by lowering process costs (Veliscek-Carolan et al 2019;Azimi et al 2019;Bhardwaj and Bhaskarwar 2018;Hu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Equilibrium and Kinetic Study of Ammonium Sorption by Raphia farinifera

Staroń

Sorys

Chwastowski

2019

Water Air Soil Pollut

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The study investigated the sorption capacity of biosorbent-raphia sp. against ammonia. Raphia fibers were used without and with the modification of its surface with NaCl, NaNO 3 , and K 2 SO 4 . The data was analyzed in the state of equilibrium using four isotherm models such as Langmuir, Freudlich, Temkin, and Dubinin-Radushkevich. The equilibrium of ammonia sorption for all studied systems was best described by the Freudlich isotherm model. On its basis, it can be assumed that the studied process is of chemical nature, which results from the value of the coefficient 1/n < 1. In order to confirm the sorption mechanism, analysis of the kinetics of the ammonia sorption process on raphia fibers was performed. Four kinetic models of sorption were calculated: pseudo-first-order model, pseudosecond-order model, Elovich model, and Webber-Morris intermolecular diffusion model. The sorption kinetics of the modeled ammonia waste were carried out using unmodified palm fibers and all kinds of surface modification. This process was best described by the pseudo-second-order sorption model, which can be considered as a confirmation of the chemical nature of ammonia sorption on raphia sp. fibers.

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“…Calcium looping cycle consists of two reactors: carbonator (here CO 2 adsorption occurs) and calciner (for CaO regeneration). Carbonator and calciner operate at 650℃ and 900℃ respectively, which follows the following reaction [3,4]:…”

Section: Introductionmentioning

confidence: 99%

Modification of Waste-derived CaO Using Organic Acids for CO<sub>2</sub> Capture

Nawar¹,

Ali²,

Khan³

et al. 2019

IJEEE

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Calcium looping is a widely used CO 2 capture technology, where calcium oxide (CaO) is used as a sorbent. However, it has many drawbacks such as expensive raw material and reduction in sorbent capacity over multiple cycles. This study is aimed at developing economic as well as environment friendly sorbents for CO 2 capturing. For this purpose, chicken eggshells were collected from household municipal waste as a CaO sorbent for CO 2 capture. The eggshell sorbent was characterized using different techniques such as SEM-EDS, XRD and TGA. Three different organic acids were used to improve the conversion of eggshell sorbents i.e., lactic, oxalic and tartaric acid. The results showed that one out of three acids i.e., lactic acid (ES LA-10%) showed improved conversion and stability over a period of 20 cycles as compared to other acids. In terms of CaO conversion ES LA-10% displayed the maximum performance of 47.8% and had improved cyclic stability during 20 cycles. Hence, this study showed that modifying sorbent (eggshells) by using acid is a better sorbent in comparison with other natural and synthetic sorbent, therefore reducing waste and cost simultaneously.

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Multicycle CO2 capture activity and fluidizability of Al-based synthesized CaO sorbents

Cited by 104 publications

References 69 publications

A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Equilibrium and Kinetic Study of Ammonium Sorption by Raphia farinifera

Modification of Waste-derived CaO Using Organic Acids for CO<sub>2</sub> Capture

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Multicycle CO2 capture activity and fluidizability of Al-based synthesized CaO sorbents

Cited by 104 publications

References 69 publications

A study of the synergistic effects of Mn/steam on CO2 capture performance of CaO by experiment and DFT calculation

A study of the synergistic effects of Mn/steam on CO2 capture performance of CaO by experiment and DFT calculation

Equilibrium and Kinetic Study of Ammonium Sorption by Raphia farinifera

Modification of Waste-derived CaO Using Organic Acids for CO&lt;sub&gt;2&lt;/sub&gt; Capture

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Product

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A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Modification of Waste-derived CaO Using Organic Acids for CO<sub>2</sub> Capture