ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Weiyang Yuan,Shuzhen Chen,Changlei Qin,Dawid Piotr Hanak,Xu Zhou
CO2 adsorption is an important approach to control the excessive CO2 emission from energy and industrial plants and mitigating the greenhouse effect. As an acknowledged high-temperature adsorbent, Li4SiO4 shows advantages in capturing a large amount of CO2 with a fast reaction rate and excellent cyclic stability. However, its CO2 adsorption capacity would be significantly affected by the flue gas impurities, such as SO2 and O2. The underlying reaction mechanism of such impurities and Li4SiO4 is still unclear. For this reason, this work studied the reaction path and kinetics between Li4SiO4 and SO2 through experiments, thermodynamic calculations, and characterizations. The results showed that Li4SiO4 reacts with SO2 to produce Li2SiO3 and Li2SO4 in the presence of O2 at 500–700 °C and forms Li2SiO3 and Li2SO3 in the absence of O2 at 500–682 °C. Furthermore, this study revealed a very low activation energy of 7.47 kJ/mol for Li4SiO4 sulfation in the presence of O2 in the kinetic-controlled stage, and the value goes up to 249.7 kJ/mol in the diffusion-controlled stage. These results will provide valuable references for the industrial applications of CO2 adsorption by Li4SiO4.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
Energies
·
2024
·Vol. 17
·期 9
·2180
·
IF 3
Xicheng Wang,Wentao Xia,Wenlong Xu,Zengqiao Chen,Xiaohan Ren,Yuandong Yang
Thermochemical energy storage (TCES) is one of the key technologies facilitating the integration of renewable energy sources and mitigating the climate crisis. Recently, Li4SiO4has been reported to be a promising heat carrier material for TCES applications, owing to its moderate operation temperature and stability. During the synthetic processes, the properties of the Si source used directly influence the performance of derived Li4SiO4materials; however, the internal relations and effects are not yet clear. Hence, in this work, six kinds of SiO2sources with different phases, morphology, particle size, and surface area were selected to synthesize a Li4SiO4-based TCES heat carrier. The physicochemical properties of the SiO2and the corresponding derived Li4SiO4were characterized, and the comprehensive performance (e.g., heat storage/releasing capacity, rate, and cyclic stability) of the Li4SiO4samples was systematically tested. It was found that the silica microspheres (SPs), which possess an amorphous phase, uniform micro-scale structure, and small particle size, could generate Li4SiO4TCES materials with a highest initial capacity of 777.7 kJ/kg at 720 °C/900 °C under pure CO2. As a result, the SP-L showed an excellent cumulative heat storage amount of 5.84 MJ/kg within 10 heat-releasing/storage cycles, which was nearly 1.5 times greater than the value of Li4SiO4derived from commonly used silicon dioxide. Furthermore, the effects of the utilized Si source on the performance of as-prepared Li4SiO4and corresponding mechanisms were discussed, which offers guidance for the future selection of Si sources to produce high-performance Li4SiO4-based TCES heat carriers.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yingchao Hu,Wenqiang Liu,Yuandong Yang,Xianliang Tong,Qianjun Chen,Zijian Zhou
Li 4 SiO 4 sorbents for high-temperature CO 2 removal have drawn extensive attention owing to their potential application in carbon capture and storage (CCS). The major challenge in the application lies in the poor CO 2 capture performance under realistic conditions of low CO 2 concentrations, owing to the dense structure and poor porosity. In this work, Li 4 SiO 4 sorbents were prepared with porous micromorphologies and large contact areas using a variety of organometallic Li-precursors, achieving fast CO 2 sorption kinetics, high capacity and excellent cyclic stability at a low CO 2 concentration (15 vol%). It was found that a high conversion of ~ 74% was maintained for pure Li 4 SiO 4 even after 100 sorption/desorption cycles. Moreover, by doping with Na 2 CO 3 to reduce the CO 2 diffusion resistance, the conversion of the sorbent was further enhanced to 93.2%. The enhancement mechanism of alkali carbonate have been proven here to be ascribed to the formation of the eutectic melt of Li/Na carbonates, the existence and function of which has been confirmed in this study.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zongze Lv,Jiaqi Ruan,Weifeng Tu,Xun Hu,Donglin He,Xin Huang,Changlei Qin
Integrated carbon capture and utilization by methanation (ICCU-methanation) is an emerging concept in reducing CO 2 emissions and storing H 2 simultaneously. One key of the technology is the development of dual functional materials (DFMs) that can efficiently capture CO 2 and then catalyze it. Herein, we propose the construction of DFM using Li 4 SiO 4 with superior CO 2 adsorption/desorption features as sorbent and catalyst carrier, CeO 2 as catalyst promoter and isolator, and Ni as catalytic metal, and comprehensively evaluate its characteristics and performance in ICCU-methanation. Results show that the DFM developed possess a high and stable CO 2 capacity of 5.4 mmol·g DFM -1 , 96 % CO 2 conversion and 96 % CH 4 selectivity under both the ideal CO 2 capturing atmosphere and the realistic flue gas containing 10 vol% steam and 8 vol% O 2 . Moreover, rapid CO 2 dissociation from the DFM is observed at a temperature lower to 560 °C due to the reaction of H* dissociated by catalyst with carbonate to form formate, which further decomposes to release CO.
研究领域:
能源化学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yingchao Hu,Hongyuan Lu,Hailong Li
Li 4 SiO 4 stands out among various solid sorbents for CO 2 capture. The commonly used mechanical granulation process for Li 4 SiO 4 sorbents causes the destruction of the microstructures. Therefore, with the characteristics of huge production and low cost, an agricultural waste (rice husk) was employed as a pore former to improve the structures of Li 4 SiO 4 pellets and, thus, enhance the cyclic CO 2 sorption performance. The rice husk templating greatly enhanced the CO 2 sorption capacity of Li 4 SiO 4 pellets. Especially, 20 wt% rice husk-templated Li 4 SiO 4 exhibited the capacity of 0.21 g/g, which was nearly twice that of the unmodified sorbent. The quick release of the combustion gases from burning rice husk could create porosity for the sorbents. In addition, the alkaline compositions in rice husk promoted the CO 2 sorption due to the decreased CO 2 diffusion resistance by the formation of molten phases. Moreover, the ashes of rice husk after high-temperature combustion were found to block the pores of the sorbents, leading to the capacity reduction. The comprehensive function of rice husk templating for Li 4 SiO 4 pellets was the tradeoff between the positive effects of pore creation and alkaline doping and the negative effects of pore blockage by the ashes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yichao Tong,Changlei Qin,Xianqing Zhu,Zongze Lv,Xin Huang,Jie Chen
Renewable energy and electric vehicles are well-acknowledged strategies for reducing CO2 emissions, and their development relies heavily on the core of energy storage systems using lithium-ion batteries. However, recycling of lithium-ion batteries is far from mature, and massive abandonment of spent batteries would lead to severe environmental pollution. Meanwhile, the shortage of lithium resources brought about by the rapid development of lithium-ion batteries, especially LiFePO4, significantly drives up the preparation cost of Li4SiO4 as a promise sorbent and greatly limits its application as a CO2 capture scheme. Hence, a strategy is urgently needed to alleviate the lithium resource contradiction between energy storage and CO2 mitigation. Herein, we report a novel concept in recycling spent LiFePO4 battery to prepare high-efficiency and low-cost Li4SiO4 sorbents for CO2 capture. The obtained Li4SiO4 sorbents demonstrate very stable CO2 capacities of 0.27–0.28 g/g in a typical test up to 80 cycles, a leading level in CO2 capture, while the cost is only 1/6 of the conventional preparation process. It suggests that the concept of recycling spent LiFePO4 for CO2 capture has broad implications on resource utilization of energy waste and the mitigation of CO2 emissions.
研究领域:
材料科学
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环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiaqi Ruan,Chang Gao,Tao Deng,Changlei Qin
Li 4 SiO 4 sorbent attracts wide attention due to its high and stable CO 2 adsorption. However, the process of CO 2 capture is significantly affected by various impurities under the circumstance of industrial applications, and water vapor is one such impurity that needs to be well studied. Herein, we aim to evaluate the effect of water vapor on physicochemical characteristics of Li 4 SiO 4 -based sorbents during cyclic CO 2 adsorption and desorption and to understand the action mechanism of H 2 O molecules on CO 2 adsorption by Li 4 SiO 4 . Reaction tests show that water vapor can significantly enhance CO 2 adsorption performance of sorbents, but the promotion effect varies with the different presence of water vapor during reactions. Material characterization and DFT calculation reveal that although the presence of water vapor leads to deterioration of internal pore structure of the sorbent, H 2 O molecule will form OH – on the surface of Li 4 SiO 4 and further react with CO 2 to generate HCO 3 – , thus the adsorption energy with water vapor presenting is increased with an observation of promoted CO 2 adsorption.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Wenxia Wang,Yuliang Zhu,Yingchao Hu
High-temperature CO 2 capture based on Li 4 SiO 4 sorbents has been well recognized as an effective approach to mitigate the global warming issues. However, the relatively low sorption performance is one of the biggest challenges for the practical application. In the current investigation, Na- and Y-based dopants have been employed to enhance cyclic CO 2 sorption performance of Li 4 SiO 4 sorbents. Various physicochemical properties and cyclic CO 2 sorption performance of the prepared sorbents have been systematically studied. The results indicated that Na 2 CO 3 and Y 2 O 3 codoped Li 4 SiO 4 sorbent (Li 4 SiO 4 -10Na-15Y) exhibited excellent cyclic CO 2 capture performance with stable capacity of >0.27 g CO 2 /g sorbent (corresponding to the carbonation conversion of ∼96 %) during 15 sorption/desorption cycles. Even under lower CO 2 concentration and longer cycles, satisfying conversions of 85 % could be kept in the cyclic tests for the codoped Li 4 SiO 4 sorbent. In addition, the materials also showed high heat storage density of 557.8 kJ/kg and the performance was stabilized in the multicycle energy storage/release tests. The characterization results showed that the introduction of Y-based dopants induced triple positive effects for Li 4 SiO 4 including porosity creation, sintering-resistant ability, and producing Li 4 SiO 4 lattice defects. As a result, the enhanced specific surface area and reduced diffusion resistance were achieved and, thus, the CO 2 sorption performance including sorption capacity (heat storage density) and cyclic stability was obviously improved.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Long Ma,Shuzhen Chen,Changlei Qin,Susu Chen,Weiyang Yuan,Xu Zhou,Jingyu Ran
Li 4 SiO 4 is a well-acknowledged CO 2 sorbent in the sorption-enhanced reforming system for low-cost H 2 production with a high purity. However, the inevitable presence of H 2 S in the biomass-derived syngas etc. could possibly affect the in-situ CO 2 adsorption significantly, which is important but has never been reported. In this work, the adsorption of CO 2 using Li 4 SiO 4 was investigated under varying H 2 S concentrations and reaction temperatures, and a series of characterization techniques were utilized to understand the effect of H 2 S and its action mechanism. The results show that the presence of H 2 S causes a rapid loss-in-capacity of Li 4 SiO 4 in capturing CO 2 during the cyclic reactions, and a higher concentration greatly exacerbates the problem. Moreover, the negative impact of H 2 S is found to have a strong relationship to the reaction temperature. It is proposed that at 325~475 °C, Li 4 SiO 4 and H 2 S react to form bits of Li 2 S and some kinds of sulfates, and at 625~775 °C, a large amount of dense KLiSO 4 is generated covering the surface of the sorbent. In contrast, at a high temperature above 925 °C, sintering of Li 4 SiO 4 plays a critical role, leading to a significant change on its microstructure.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Ke Wang,Youwei Zhao,Peter T. Clough,Pengfei Zhao,Edward J. Anthony
Structurally modified and improved NaBr-co-doped Li 4 SiO 4 ceramics were developed for CO 2 absorption in low-CO 2 -concentration atmospheres. Pure and NaCl-doped Li 4 SiO 4 ceramics were also prepared for comparison. The samples were analyzed by X-ray diffraction, Scanning Electron Microscopy, N 2 adsorption, X-ray photoelectron spectroscopy, differential scanning calorimetry , and thermogravimetric analyses (dynamic and isothermal). The sorption kinetics were obtained using a double exponential model. The results showed that both Na and Br can be introduced into the Li 4 SiO 4 structure and doped on Li and oxygen sites, respectively. The doped sample presented a Li 2 O-enriched surface, guaranteeing abundant Li O sites and are significantly different from previous anionic (CO 3 , F and Cl) doping of Li 4 SiO 4 , Br doping also generated macroporous features with small particle size, these favorable characteristics promoted the surface chemisorption kinetics. Moreover, DSC analysis confirmed the formation of the molten phases during CO 2 absorption, which helps improve the lithium diffusion kinetics . Here, 0.1 mol NaBr doping was used to reach a maximum absorption capacity (>30.0 wt%) in 15 vol% CO 2, suggesting that NaBr-doped Li 4 SiO 4 ceramics have great potential for CO 2 capture at high temperature.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiaqi Ruan,Zongze Lv,Yong He,Xin Huang,Jingyu Ran,Changlei Qin
High-temperature CO 2 adsorption has an attractive prospect in reducing CO 2 emissions efficiently. As the core of CO 2 adsorption technology, sorbents suffer from a well-known problem of capacity degradation as a result of sintering during cyclic CO 2 adsorption and desorption at high temperatures. This work aims to understand the microstructural evolution of Li 4 SiO 4 , one of the most typical and promising sorbents, during CO 2 capture. In-situ Transmission Electron Microscopy was used to directly capture the morphological variation of Li 4 SiO 4 sorbents. Comprehensive characterization techniques were adopted to quantify microstructural parameters of Li 4 SiO 4 under different conditions . The real-time shrinkage of Li 4 SiO 4 particles was demonstrated and equations on grain growth, specific surface area reduction, and pore volume evolution were established. The work can not only reveal the reason for the reduction of CO 2 capacity, but provide a theoretical guidance for the development of sintering-resistant CO 2 sorbents.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2024
·
IF 2.8
Runze Geng,Jin Hu,Youwen Zhai,Juemin Yan,Kaijun Wang,Weijun Zhang,Qingming Chen,Xiang Liu,Kaizhao Wang
The tritium breeder's primary research focus is to inhibit lithium's volatilization during sintering and improve the mechanical properties of tritium breeder ceramic pebbles. In this study, ceramic pebbles were prepared by wet method using lithium alginate as a lithium supplement and polyvinyl alcohol. The effects of different contents of lithium alginate (LA) and polyvinyl alcohol (PVA) on ceramic pebbles were systematically studied. The results show that the lithium content in Li 4 SiO 4 pebbles after sintering can be increased to 27.6wt% by adding 3wt% lithium alginate, which effectively inhibits the volatilization of lithium. In addition, when the sintering temperature is 1000℃ and the duration is 6 h, the crush load of ceramic pebbles can be increased to 50.9 N, and the density can reach 2.01 g/cm 3 . The above results indicate that Li 4 SiO 4 ceramic pebbles rich in lithium, which can meet the demand for tritium breeding ceramics, can be prepared by adding LA.
研究领域:
材料科学
·
核工程
·
陶瓷科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）