Optimization of sol-gel combustion synthesis for calcium looping CO2 sorbents, part Ⅰ: Effects of sol-gel preparation and combustion conditions

Luo, Tong; Luo, Cong; Shi, Zhaowei; Li, Xiaoshan; Wu, Fan; Zhang, Liqi

doi:10.1016/j.seppur.2022.121081

Cited by 12 publications

(7 citation statements)

References 73 publications

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“…For pore widths ranging from 0 to 250 nm, the pore volume of each absorbent increased initially and then leveled off as the pore width increased. After 10 cycles, the CMZ absorbent has a high cumulative pore volume, confirming the abundance of the adsorbent in the pore structure . The cumulative pore volume of the CS-10 absorbent was considerably lower than that of the CMZ absorbent.…”

Section: Resultsmentioning

confidence: 80%

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Highly Cyclic Stability and Absorbent Activity of Carbide Slag Doped with MgO and ZnO for Thermochemical Energy Storage

et al. 2022

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Carbide slag is a solid waste with a high content of reactive CaO, which can be used as an active material for the chemical absorption of CO2 and calcium looping. Calcium looping of CaO-based absorbents is one of the most promising methods of thermochemical energy storage. However, the sintering of pores and a reduction in the CO2 diffusion rates as the carbonization/calcination cyclic reaction progresses have posed challenges to the practical application of CaO-based absorbents. This study proposes a method for alleviating the sintering of the pore structure by improving the activity and cycling stability of such absorbents by doping carbide slag with MgO and ZnO powders. Results showed that the raw material ratio, reaction temperature, and reaction time have a considerable influence on the CO2 absorption rate. Furthermore, the specific surface area and pore volume of the absorbents increased with increasing ZnO and MgO doping levels in the carbide slag. Thus, the problems of sintering and clogging of pores in CaO-based absorbents were effectively alleviated, and the MgO and ZnO-doped absorbents CMZ85 and CMZ90 maintained 41–42% CO2 absorption after 10 cycles. These results confirmed that the cyclic stability and absorbent activity improved significantly with the MgO and ZnO doping of carbide slag for the calcium looping process.

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Section: Resultsmentioning

confidence: 80%

“…After 10 cycles, the CMZ absorbent has a high cumulative pore volume, confirming the abundance of the adsorbent in the pore structure. 37 The cumulative pore volume of the CS-10 absorbent was considerably lower than that of the CMZ absorbent.…”

Section: Resultsmentioning

confidence: 90%

Highly Cyclic Stability and Absorbent Activity of Carbide Slag Doped with MgO and ZnO for Thermochemical Energy Storage

et al. 2022

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“…In general, the specific surface area and pore volume of the composite material are positively correlated with the energy storage performance during the cycle. The carbonization conversion rate and energy storage performance improve with increasing specific surface area and pore volume . For fresh composite materials before cycling, the specific surface areas of the pure carbide slag material W-CS and the acetic acid single-modified material AC-CS are 6.4935 and 7.5453 m 2 /g, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The carbonization conversion rate and energy storage performance improve with increasing specific surface area and pore volume. 46 For fresh composite materials before cycling, the specific surface areas of the pure carbide slag material W-CS and the acetic acid single-modified material AC-CS are 6.4935 and 7.5453 m 2 /g, respectively. Similarly, the specific surface areas of the dual-modified AC-CMZ80 and AC-CMZ75 composite materials are 11.9762 and 11.2723 m 2 / g, respectively.…”

Section: Effect Of the Cyclic Energy Storagementioning

confidence: 99%

A Dual Modification Method to Prepare Carbide Slag into Highly Active CaO-Based Solar Energy Storage Materials

Gao,

Zhang,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Carbide slag is a solid waste with high calcium content that is generated from acetylene production. To achieve efficient resource utilization of carbide slag, this work mainly adopts a dual modification method that combines the doping of inert substances with wet mixing of acetic acid to convert carbide slag into highly active CaO-based energy storage materials. Because of the addition of acetic acid and inert dopants, the energy storage performance of the composite material is significantly enhanced. After 20 cycles, the carbonization conversion rate and energy storage density of the dual-modified composite material (AC-CMZ75) are 0.79 and 2500 kJ/kg, which are 1.88 and 3.29 times higher than those of the acetic acid single-modified (AC-CS) and pure carbide slag materials (W-CS), respectively. In addition, the average grain size of CaO in the dual-modified composite material increases slowly and has a richer pore structure, which is beneficial for alleviating the sintering phenomenon of CaO in the carbide slag. Therefore, compared to pure carbide slag materials, the dual-modified composite materials are more resistant to sintering during long-term calcium cycling, exhibiting better energy storage performance and cycling stability.

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“…It was also found that the photocatalytic properties of the sol-gel prepared TiO 2 nanopowder depend mainly on the sol composition, where the addition of water, HCl, and diethanolamine as well as the type of alcohol as solvent (ethanol, propanol, and butanol) were found to greatly affect the photocatalytic activity of the powder toward bromophenol blue dye removal [11]. Luo et al [12] studied some of the variables related to the sol-gel preparation of CaO as a high-performance sorbent and they concluded that the molar ratio of H 2 O:Ca 2+ had a minor effect on the CO 2 sorption performance of the CaO, and the optimal molar ratio was 80:1. The optimal molar ratio of citric acid: calcium nitrate optimal molar ratio is 1:1, and adding an excess of citric acid led to more gaseous products.…”

Section: Figurementioning

confidence: 99%

Synthesis of Some Functional Oxides and Their Composites Using Sol-Gel Method

Hassen¹,

Sayed²,

Al‐Ghamdi³

et al. 2023

Sol-Gel Method - Recent Advances

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Two main approaches for nanomaterials fabrication are the top-down and the bottom-up methods. The first is limited to mechanical grinding, thermal evaporation, ion sputtering, arc discharge, pulsed laser ablation, and other physical and chemical vapor deposition. These routes are costly, consume higher energy, and require complex technology such as ultrahigh vacuum. The bottom-up methods refer to the production of complex nanostructured materials from atoms and molecules. This approach is relatively simple and low in cost. However, it requires a good knowledge of the optical properties of the particles and their modifications when the particles are integrated with nanostructures. One of the widest bottom-up methods is the sol–gel. It involves a solution or sol (single-phase liquid) that undergoes a sol–gel transition (stable suspension of colloidal particles). In this chapter, we throw light on the history of sol–gel, its advantages, and limitations, operating this method for the production of different types of nanomaterials in the form of powders or thin films. In addition, some applications of the sol–gel-derived nanosized materials will be discussed.

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Optimization of sol-gel combustion synthesis for calcium looping CO2 sorbents, part Ⅰ: Effects of sol-gel preparation and combustion conditions

Cited by 12 publications

References 73 publications

Highly Cyclic Stability and Absorbent Activity of Carbide Slag Doped with MgO and ZnO for Thermochemical Energy Storage

Highly Cyclic Stability and Absorbent Activity of Carbide Slag Doped with MgO and ZnO for Thermochemical Energy Storage

A Dual Modification Method to Prepare Carbide Slag into Highly Active CaO-Based Solar Energy Storage Materials

Synthesis of Some Functional Oxides and Their Composites Using Sol-Gel Method

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