ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zain Ali Saleh Bairq,Hongxia Gao,Fatima Abduh Mohammed Murshed,Paitoon Tontiwachwuthikul,Zhiwu Liang
In the CO2 capture process, decreasing the energy consumption and increasing the desorption rate of loaded MEA-CO2 during the regeneration process of monoethanol amine have been identified as major challenges that need to be addressed. To overcome these challenges, three modified heterogeneous mesoporous catalysts, CMK-3-SiO2, CMK-3-MCM-41, and CMK-3-SBA-15, and a SO42–/ZrO2 solid acid catalyst were initially synthesized and investigated to determine their catalytic effectiveness in the process of CO2 and MEA solvent regeneration with a CO2 loading of 0.5 ± 0.02 mol CO2/mol MEA at 97 °C. According to the experimental results, the CMK-3-modified catalyst significantly decreased the energy requirement for CO2 desorption. The catalytic performance of the synthesized catalysts was in the order of CMK-3-SiO2 > CMK-3-MCM-41 > CMK-3-SBA-15 > SZ. CMK-3-SiO2 exhibited the best catalytic performance by enhancing the desorption rate by 195%, and decreasing the energy requirement by 37.41% compared to monoethanol amine as a blank run. Furthermore, the CMK-3-SiO2 catalyst exhibited the best catalytic performance compared to the literature with excellent stability and no unfavorable effects on the MEA-CO2 absorption activity for the regenerated amine solvent. This performance seems to be a result of the large mesoporous surface area (BET) and the large number of Brϕnsted and Lewis acid sites. In addition, a reasonable reaction mechanism for amine solvent regeneration with the CMK-3 heterogeneous catalyst is proposed.
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
APPLIED ENERGY
·
2019
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IF 8.426
Zain Ali Saleh Bairq,Hongxia Gao,Yufei Huang,Haiyan Zhang,Zhiwu Liang
A significant impediment to the widespread adoption of amine-based post-combustion technique for CO 2 capture from flue gas is the huge energy demand for amine solvent regeneration. In this study, five novel bifunctional heterogeneous catalysts e.g., SO 4 2− /ZrO 2 /SiO 2 with different molar ratios of zirconia and SO 4 2− /ZrO 2 as a parent catalyst were synthesized and applied to evaluate their effectiveness in enhancing the CO 2 desorption and solvent regeneration of 5M monoethanolamine solution with CO 2 loading of 0.5 ± 0.01 mol CO 2 /mol monoethanolamine at 97 °C. The catalysts were characterized by Fourier transform-infrared spectrometry, pyridine-infrared spectroscopy, X-ray diffraction, N 2 -adsorption-desorption, and ammonia-temperature programmed desorption. The results demonstrated that these catalysts can significantly reduce the heat duty for CO 2 desorption by 36.48% compared to without catalyst and enhance desorption rate by 35.1%. The results also showed that SO 4 2− /ZrO 2 /SiO 2 15% presented the highest efficiency compared to the other SO 4 2− /ZrO 2 /SiO 2 ratios and the super solid acid catalyst SO 4 2− /ZrO 2 . Additionally, to investigate if the catalysts induce any unfavorable effects on the amine, the absorption of CO 2 by regenerated amine solvent was studied. Finally, a reaction mechanism for the amine solvent regeneration with the synthesized catalyst e.g., SO 4 2− /ZrO 2 /SiO 2 was suggested.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Yinge Bai,Kaixuan Wang,Lulu Wang,Shaojuan Zeng,Lu Bai,Xiangping Zhang
CO 2 capture is an important technology to achieve carbon emission reduction. The key is reducing the energy consumption of the CO 2 capture process. Ionic liquids (ILs) blended with organic amines can be used as an efficient CO 2 absorbent allowing for low regeneration energy consumption. This work proposes the use of N-butylpyridinium nitrate ([Bpy][NO 3 ]) in combination with organic solvents for CO 2 capture. The effects of ILs concentration, reboiler load and flue gas concentration on regeneration energy consumption were studied on a continuous pilot unit for absorption-desorption process. The results showed that the CO 2 absorption capacity of 30 wt% MEA + 10 wt% [Bpy][NO 3 ] was 0.1308 g CO 2 /g solvent, higher than monoethanolamine/water, and the CO 2 absorption capacity remained at 74.3% after the five cycles. At 40 °C, the viscosity of IL-amine blending solvents before and after absorption was 2.01 and 3.534 mPa·s, respectively, significantly lower than that of the conventional non-aqueous phase absorbent. The continuous absorption-desorption results showed that the capture rate of IL blending reached more than 95%. The regeneration energy consumption is 34.2% lower than the 30 wt% MEA.
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
Journal of Cleaner Production
·
2024
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IF 9.7
Yunlong Zhu,Hongyuan Xi,Song Zhou,Majed Shreka,Yifeng Wu,Jinquan Lin,Wenming Yang
High desorption energy consumption and low cyclic loading are critical issues limiting the application of onboard carbon capture (OCC) systems. In this study, a tetraethylenepentamine (TEPA) and 2–amino–2–methyl–1–propanol (AMP) mixed amine solvent with low desorption energy consumption and high CO 2 cyclic loading, suitable for the operational environment of OCC systems, has been proposed. Detailed research was conducted on the capture performance and mechanism of the TEPA + AMP mixed amine solvent. The 0.25M TEPA+0.75M AMP mixed amine solvent exhibited the best performance, with an 86.5% increase in CO 2 loading, a 214% increase in single–cycle CO 2 loading, a 236% increase in CO 2 loading after four cycles compared to monoethanolamine (MEA), and a 20.76% reduction in desorption energy consumption. In addition, to address the challenge of applying polyamine mixed solutions in the simulation studies of OCC systems, the capture mechanism was analyzed using density functional theory (DFT) calculations and nuclear magnetic resonance (NMR) characterization. The results indicated that increasing AMP promoted HCO 3 − formation in the TEPA + AMP mixed amine solvent. Since HCO 3 − decomposed more easily than carbamate, it reduced desorption energy consumption. However, an excess of AMP inhibited the absorption rate of TEPA, affecting the absorption capacity. Increasing the concentration of TEPA enhanced the amine concentration in the absorbent and improved the absorption performance. Nevertheless, excessive TEPA caused AMP to participate only in deprotonation reactions, which was not conducive to reducing desorption energy consumption.
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
RSC Advances
·
2021
·Vol. 11
·期 18
·10929-10934
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IF 3.361
Chuangui Cao,Zhihui Zhao,Yong Qi,Hui Peng,Kuanjun Fang,Ruyi Xie,Weichao Chen
The aggregation of dyes is a common phenomenon in solutions, particularly concentrated solutions, which seriously affects the dyeing and printing processes. In this study, the effects of alkylamine solvents on the reactive dye aggregation behavior in highly concentrated solutions was studied. Typical cases were conducted with two slightly toxic and environmentally friendly solvents, namely diethanolamine (DEA) and triethanolamine (TEA), and two reactive dyes, namely C. I. Reactive Red 218 (R-218) and C. I. Reactive Orange 13 (O-13). Aggregation states were studied by ultraviolet-visible (UV-Vis) absorption spectroscopy, Gaussian-peak-fitting method and fluorescence spectroscopy. The results showed that both the additives DEA and TEA could reduce the dye aggregation because the solvents, DEA and TEA, can break the iceberg structure and allow easy entry of the molecules into the dye aggregates. Also, the disaggregation caused by DEA was higher as compared with TEA, which may be caused by the weaker hydrogen bond and the relatively smaller steric hindrance effects of DEA. The schematic of disaggregation between R-218 and DEA was also discussed. For R-218, the dimers were disaggregated to monomer, while the higher-ordered aggregates were disaggregated to trimers and dimers for O-13. Moreover, physical properties such as viscosity and surface tension of the solutions were measured. This investigation is instructive for the further dyeing progress with organic bases in the textile industries.
研究领域:
化学工程
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纺织科学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2024
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IF 3.4
Zhi-Gang Hu,Lichun Li,Shui-Bao Yu,Zhengfei Chen,Jian-Quan Weng
Several tertiary amine solutions with different structures were tested in the integrated CO 2 capture and hydrogenation process in the presence of heterogeneous Pd/NAC catalysts. The tertiary amines of 3-dimethylamino-1,2-propanediol (3DMA-1,2-PD) and 3-diethylamino-1,2-propanedio (3DEA-1,2-PD) with high CO 2 absorption capacity and high formate yield were selected as suitable candidates as CO 2 capture and hydrogenation solvents. Under mild reaction conditions, a high formate yield of 68% was achieved when using 1 M 3DMA-1,2-PD solution with CO 2 loading of 0.5 mol amine/mol CO 2 . In addition, the physico-chemical properties of the Pd/NAC catalysts were examined and the reaction mechanism of CO 2 absorption and hydrogenation in the presence of Pd/NAC was proposed.
研究领域:
化学工程
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bareera Raza,Yang Zhang,Ming Xu,Jun Yang,Yanna NuLi,Jiulin Wang
Rechargeable Zinc batteries as energy storage and conversion devices are attracting wide attention due to their merits of intrinsic safety, abundant resources, and inexpensive components. However, the thermodynamic instability of Zn metal anode in the aqueous environment leads to limited cycle life, poor rechargeability, and restricted large-scale employment of Zinc batteries. Herein, we investigate the electrochemical and morphological behavior of Zn anode in an organic aprotic amide, N’N -dimethylacetamide (DMAC) solvent-based electrolyte, which demonstrates highly reversible Zn deposition (CE of ∼ 99.80%), improved anodic stability (∼2.4 V vs. Zn/Zn 2+ ), and a high current capability of 15.0 mA cm −2 /15.0 mAh cm −2 . Practically, a remarkable performance with high-capacity retention and high CE (≥99%) is attained for Zn||MnO 2 full cell, which is a positive step toward the development of rechargeable Zinc batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Rujie Wang,Shanshan Liu,Qiangwei Li,Shihan Zhang,Lidong Wang,Shanlong An
Blended amine solvents are considered potential alternatives to monoethanolamine for CO 2 capture, for the fast absorption kinetics of primary/secondary amine and low regeneration penalty of tertiary amine. In this research, blended amine solvents comprising N,N-dimethylcyclohexylamine (DMCA) and N-methylcyclohexyamine (MCA) were proposed. CO 2 absorption increased the polarity of the products and ensured the absorbent remained homogenous throughout the absorption/desorption cycles. Through quantum chemical calculation, the low stability of MCA-carbamate was confirmed by a ΔΔG 3 value of −6.41 kcal/mol, and a possible reaction route from carbamate to bicarbonate was revealed. Thus, the CO 2 capacity of DMCA-MCA reached 0.875–0.985 mol CO 2 /mol amine. Moreover, MCA exhibited considerably low forward energy barrier for zwitterion formation (2.7 kcal/mol), and the CO 2 absorption of DMCA could be accelerated through the proton transfer reaction with the MCA-zwitterion. Accordingly, the total mass transfer coefficient of CO 2 in DMCA-MCA approached 2.02 × 10 −10 mol/cm 2 s Pa, which was 1.2-fold higher than that of 5 M MEA. The total regeneration energy of DMCA-MCA blend was estimated at 2.20 GJ/t CO 2 , which was 44.9% lower than 5 M MEA. This study developed a novel DMCA-MCA blended solvent with rapid absorption rate, huge CO 2 capacity and efficient regeneration for CO 2 capture.
研究领域:
化学工程
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环境科学
·
物理化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fanzhi Meng,Tongyao Ju,Siyu Han,Li Lin,Jinglin Li,Kailun Chen,Jianguo Jiang
The biphasic amine solvent based on ionic liquid could effectively improve the efficiency of carbon dioxide capture and regeneration, greatly reduce the energy consumption of regeneration, and hold an excellent application prospect in the field of large-scale biogas upgrading. In this work, a biphasic mixed amine system consisting of Methyl monoethanolamine (MMEA), N-methyldiethanolamine (MDEA), and 1-butyl-3-methylimidazolium tetrafluoroborate (BF) was prepared for the removal of trace components and CO 2 during biogas upgrading and compared with traditional 30 wt% MEA and mixed amine solution of MMEA and MDEA for biogas upgrading. The results showed that H 2 S and NH 3 would chemically react with the biphasic solvent and thus facilitate the removal of trace components, and that the reacted solution would not affect its regeneration characteristics and could basically be recycled at a regeneration temperature of 125 °C. In addition, the phase separation efficiency of the biphasic agent was not affected by the introduction of trace components, and all reaction products except the ionic liquid were enriched in the rich phases and the carbon enrichment rate reached about 98%, which reduced regeneration energy consumption by 44.07% compared to 30 wt% MEA. Finally, the mechanism of phase separation of reaction products and ionic liquids was discussed in the context of quantum chemical calculations, and the importance of intermolecular van der Waals forces in the phase separation process was clarified, and the reasons for the appearance of phase separation phenomena were explained.
研究领域:
化学工程
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环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Rui Zhang,Ruixi Liu,Francesco Barzagli,Meher Geetika Sanku,Chao'en Li,Min Xiao
Mixing different amines is a common method to develop better solvents for CO 2 capture. As the mixing provides more adjustability on the solvent properties, it introduces complex interaction between dissimilar amine molecules who may perform diverse role in the reactions. Here we studied CO 2 absorption in monoethanolamine (MEA), methyldiethanolamine (MDEA) and their mixtures thereof. The speciation profiles along with CO 2 loading were provided via NMR to reveal the competition/coordination of MEA and MDEA in participating the key reactions that drove CO 2 absorption (i.e. carbamate formation and amine protonation). Furthermore, the CO 2 loading of the solvents were measured under equilibrium for various temperature, CO 2 partial pressure. The excessive CO 2 loading was firstly introduced to analyze the loading data regarding the solvent composition. Accordingly, an excessive property model was applied for data correlation. The calculated CO 2 loading agreed well with experimental data with average absolution relative deviation of 1.7%.
研究领域:
化学工程
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环境科学
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物理化学
✓ 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）