MOLECULES
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2022
·Vol. 27
·期 11
·3429
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IF 4.927
Yilan Chen,Junjie Wu,Xin Wang,Minyi Liu,Yamin Liu
An efficient CO2adsorbent with a hierarchically micro-mesoporous structure and a large number of amine groups was fabricated by a two-step synthesis technique. Its structural properties, surface groups, thermal stability and CO2adsorption performance were fully investigated. The analysis results show that the prepared CO2adsorbent has a specific hierarchically micro-mesoporous structure and highly uniformly dispersed amine groups that are favorable for the adsorption of CO2. At the same time, the CO2adsorption capacity of the prepared adsorbent can reach a maximum of 3.32 mmol-CO2/g-adsorbent in the actual flue gas temperature range of 303–343 K. In addition, the kinetic analysis results indicate that both the adsorption process and the desorption process have rapid adsorption/desorption rates. Finally, the fitting of the CO2adsorption/desorption experimental data by Avrami’s fractional kinetic model shows that the CO2adsorption rate is mainly controlled by the intra-particle diffusion rate, and the temperature has little effect on the adsorption rate.Keywords:CO2adsorbent;hierarchically micro-mesoporous silicon;amine-functionalized;kinetic
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zongze Lv,Junqiang Han,Tao Deng,Chang Gao,Jianan Li,Changlei Qin
Integrated CO 2 capture and utilization (ICCU) is an emerging technology to reduce CO 2 emissions by greatly simplifying the processes of conventional CO 2 capture and utilization. In particular, ICCU-methanation could directly convert the low-concentration CO 2 into CH 4 using hydrogen from new energy electricity, representing an efficient Power-to-Gas route. CO 2 adsorption/catalytic materials play a crucial role for the operation of ICCU-methanation, and it is more feasible to scale up material production and avoid components interference by directly combining the sorbent and catalyst. However, it is necessary to reveal the effect of different arrangements of sorbent and catalyst on reaction characteristics of ICCU-methanation. In the work, the matching of K 2 CO 3 -doped Li 4 SiO 4 sorbent with various supported Ni-based catalyst was tested and four arrangements of sorbent and catalyst particles in a fixed-bed were investigated to understand the influences on ICCU-methanation. Results show that the presence of catalyst accelerates CO 2 supply by sorbent and achieves quicker methanation, and the promotion effect becomes more obvious with a closer contact between the sorbent and catalyst. Under optimized conditions, ICCU-methanation of uniformly mixed K-Li 4 SiO 4 and Ni/Al 2 O 3 shows an excellent performance with very stable CO 2 conversion of 95.58% and CH 4 selectivity of 93.29% during cyclic reactions.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Shangqing Lu,Sufang Wu
Li 2 SO 4 doped nano CaO (Li 2 SO 4 @nano CaO) based CO 2 adsorbent has been developed to improve calcination–carbonation durability. Li 2 SO 4 @nano CaO adsorbent was obtained by calcination of Li 2 SO 4 doped nano CaCO 3 that was prepared by a simple wet solution impregnation method. The morphology and microstructural properties of the adsorbent were examined by scanning electron microscopy (SEM) and nitrogen physisorption tests, and its cyclic calcination–carbonation performance was evaluated by thermogravimetric analysis (TGA). The results show that Li 2 SO 4 @nano CaO adsorbent maintains a 51.0% CaO conversion after 11 cycles under the calcination temperature of 750 °C and carbonation temperature of 600 °C with an optimized Li 2 SO 4 content of 3.0–5.0 wt.%. Alternatively, pure nano CaO maintains only a 27.3% conversion at the same conditions. A physical property analysis reveals that the superior performance of Li 2 SO 4 @nano CaO adsorbent is attributed to the pore diameter enlargement and to the increase of macro-pore proportion due to Li 2 SO 4 incorporation. Moreover, the carbonation and calcination rates of Li 2 SO 4 @nano CaO adsorbent are accelerated compared with nano CaO adsorbent, and the complete decomposition temperature is at least 15 °C lower. In comparison with the adsorbent doped with other lithium salts (Li 2 CO 3 and LiCl), Li 2 SO 4 @nano CaO adsorbent possesses the best durability under equivalent doping conditions. Furthermore, the positive linear correlation between the complete decomposition temperature and CaO conversion has been maintained.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Yaling Zhang,Shuai Chao,Xi Zhang,Junguo Li,Yiming Duan,Chunhui Gu,Jiale He
The iron and steel industry is facing two urgent needs of comprehensive utilization of bulk solid waste and CO 2 emission reduction. Using LF refining slag as raw material to prepare efficient calcium-based CO 2 adsorbents can achieve the goals of waste-to-resource conversion and cleaner production. In this study, LF refining slag-derived CaO/C 12 A 7 high-temperature calcium-based CO 2 adsorbent materials with abundant pore defects were synthesized by the co-precipitation method, which showed the optimal high-temperature adsorption performance at 700 °C and pure CO 2 atmosphere, with an adsorption capacity of up to 0.681 g/g, which is 1.58 times that of the adsorption capacity of commercial CaO. C 12 A 7 , as an inert skeleton of adsorbent material, can inhibiting the agglomeration of CaO particles and slowing down the sintering deactivation process. After 20 cycles of calcination-carbonation, the adsorption capacity degradation rate was 32.5 %, lower than that of commercial CaO at 37.8 %. The related research effectively enhances the added value of resource utilization from LF refining slag and holds the potential to achieve a balance among environmental, economic, and social benefits in the steel industry.
研究领域:
材料科学
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环境科学
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冶金工程
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Yang-Yang Hao,Ming-Xiu Xiao,Guo-Cui Mao,Jin-Peng Wang,Zhan-Kuo Guo,Bao-Xia Dong,Yun-Lei Teng
Capturing CO 2 using clamshell/eggshell-derived CaO adsorbent can not only reduce carbon emissions but also alleviate the impact of trash on the environment. However, organic acid was usually used, high-temperature calcination was often performed, and CO 2 was inevitably released during preparing CaO adsorbents from shell wastes. In this work, CaO-based CO 2 adsorbent was greenly prepared by calcium-induced hydrogenation of clamshell and eggshell wastes in one pot at room/moderate temperature. CO 2 adsorption experiments were performed in a thermogravimetric analyzer (TGA). The adsorption performance of the adsorbents obtained from the mechanochemical reaction (BM-C/E-CaO) was superior to that of the adsorbents obtained from the thermochemical reaction (Cal-C/E-CaO). The CO 2 adsorption capacity of BM-C-CaO at 650 °C is up to 36.82 wt%, but the adsorption decay rate of the sample after 20 carbonation/calcination cycles is only 30.17%. This study offers an alternative energy-saving method for greenly preparing CaO-based adsorbent from shell wastes.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 8
·3462-3470
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IF 9.931
Rui Han,Jihui Gao,Siyu Wei,Yanlin Su,Yukun Qin
High-temperature sorption of CO2via calcium looping is a promising technology for the implementation of carbon capture and storage (CCS). However, the major drawback of this technology is the rapid deactivation of CaO sorbents due to sintering. Here, a facile and cost-effective limited-space metal organic chemical vapor deposition approach is proposed to develop CaO-based sorbents exhibiting a very high and cyclically stable CO2 uptake. The TEM results show that Al2O3 nanoparticles (4–8 nm) are uniformly coated onto CaO crystalline grains, thus effectively inhibiting the sintering of sorbents. After 20 severe cycles, the synthetic sorbent, stabilized by 10 mol% Al2O3, exceeded the CO2 uptake of the benchmark CaO by more than 300%. Furthermore, the influence of Ca-based precursors on the synthetic sorbent's cyclic CO2 uptake was established. The result shows that the sorbents synthesized from different Ca-based precursors all demonstrate high cycling stability, which means that low-cost and high-performance sorbents can be synthesized through selecting a low-cost Ca precursor, such as CaCO3.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Xiangyu Li,Zhiqing Wang,Ru Feng,Jiejie Huang,Yitian Fang
If a large amount of fly ashes produced by coal-fired power plants was not treated harmlessly, it will pose a serious threat to the ecological environment. As one of the high-valued utilization technologies of fly ash, the technology of extracting aluminum from coal ash produces large quantities of waste residue after acid leaching nevertheless. It is an economic and environmentally friendly way to recycle alumina-extracted residue (AR) as solid sorbent to capture CO 2 . In this study, using AR as raw material, we synthesized PEI modified solid sorbents by novel “wet gel impregnation” method (WGI) to enhanced CO 2 capture. The effects of amine loading, adsorption temperature, and impregnation method on CO 2 adsorption capacity and kinetics were investigated by thermogravimetric analysis (TGA). On this basis, a possible double-layer adsorption model was proposed, i.e., the PEI adsorption layer on the outer surface of sorbents and the internal isolation layer. The ratio of the two layers changed with the variation in PEI loading and adsorption temperature, resulting in the difference of adsorption capacity. The maximum CO 2 adsorption capacity of 2.07 mmol/g was obtained under the amine loading of 40 wt% at 95 °C, and 100% CO 2 . Moreover, the stable adsorption capacity and high CO 2 selectivity were maintained in five repeated adsorption-desorption cycles.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2023
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IF 6
Shi-yu Feng,Kai Li,Ting Huang,Cheng-bo Zhang,An-qing Zheng,Yan-qin Huang,Shi-guan Yang,Qiang Lu
This study presented a novel method for the simultaneous generation of monophenol chemicals and carbon-based CO 2 adsorbent from polycarbonate (PC) by using salt solution-enhanced pyrolysis. The regulatory functions of several factors on the production of 4-isopropenylphenol (IPP) and phenol were investigated using a laboratory-scale pyrolysis reactor , including salt solution type (neutral, acidic, and alkaline), solution concentration, and pyrolysis temperature. The results revealed that the Na 2 CO 3 solution exhibited the best ability to enhance the preparation of IPP and phenol. At Na 2 CO 3 concentration of 1 mol/L and pyrolysis temperature of 600 °C, the optimum yields of IPP and phenol reached 28.83 wt% and 33.77 wt%, respectively. The pyrolysis char (PCSC) obtained under this condition exhibited good CO 2 adsorption behavior with a maximum adsorption capacity of 1.75 mmol/g at 30 °C because of its well-formed porous structure and copious oxygen-containing functional groups.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
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IF 5.455
Shuoyu Wang,Xianyu Qiu,Yangguan Chen,Shuixia Chen
Amine-functionalized porous adsorbent is one kind of important materials in carbon dioxide capture due to its stability and efficiency. In this study, a copolymer (polyHIPE) with interconnected macropore networks, hierarchical porous structure and abundant branched amino groups was prepared by high internal phase emulsion (HIPE) strategy via copolymerization of styrene (St), divinylbenzene (DVB), tetraethyl orthosilicate (TEOS), and triethoxyvinylsilane (VTEO), and then a novel amine-functionalized CO 2 adsorbent was synthesized by in situ ring-opening grafting copolymerization of aziridine with the polyHIPE. The structure, morphology, and physicochemical properties of the polyHIPEs were characterized by FTIR, TEM, TGA , and SEM. The key roles of VTEO and TEOS in introducing active hydroxyl groups onto the surface of the inert polymer was evaluated, which was essential to improve the hydrophilicity of the polyHIPE and to provide reactive sites to combine with amine agents. The contact angle of the polyHIPE while copolymerized with TEOS and VTEO significantly was decreased from 144° to 72°. In order to further increase the specific surface area of the polyHIPEs, post crosslinking of polyHIPEs was implemented through a Friedel–Crafts reaction. The specific surface area of post-crosslinked polyHIPE could reach 513 m 2 /g, which was proven to be effective to enhance its CO 2 adsorption capacity. Finally, the abundant branched amino sites via aziridine grafting and high surface area greatly enhanced CO 2 adsorption capacity of the amino-modified polyHIPEs. The adsorption capacity of 2.40 and 3.25 mmol CO 2 /g could be achieved under dry and humid conditions in 0.1 atm partial pressure of CO 2 , respectively.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）