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
·
环境科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 3
·649-664
·
IF 2.659
Liangyu Zou,Hongxia Gao,Zeyang Wu,Zhiwu Liang
BACKGROUND The addition of a physical solvent to a traditional chemical absorbent has been shown to improve the absorption and desorption performance of the absorbent system. This type of novel absorbent system combining a single physical solvent with an amine solvent is a promising development in the industrial application of CO 2 capture. RESULTS Hybrid solutions composed of Monoethanolamine (MEA), a physical solvent, and H 2 O were comprehensively investigated using the rapid solvent screening apparatus and a VLE apparatus. The results show that 30 wt% MEA with 20 wt% Sulfolane and 50 wt% H 2 O achieved higher rich loading, strong cyclic CO 2 capacity and the highest desorption rate over a wide range of CO 2 loadings. Also, the mass transfer performance of CO 2 absorption into the 30 wt% MEA and 20 wt% Sulfolane solution was investigated in a lab-scale random packing column. The effects of liquid flow rate, liquid feed temperature, lean CO 2 loading, inert gas flow rate and CO 2 partial pressure on the mass transfer performance were evaluated in terms of volumetric overall mass transfer coefficient ( K G a v ). Furthermore, a correlation was developed for CO 2 absorption into MEA/Sulfolane solution in a random packing column using semi-empirical models as functions. CONCLUSION Unlike for amine solution alone, inert gas flow rate is an indispensable operating parameter in the MEA/Sulfolane system. A mass transfer correlation model was established and holds significance in studying the kinetics of CO 2 absorption by a mixture of physical and chemical solvents and for the optimal design of Dixon-ring random packing columns. © 2019 Society of Chemical Industry
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuchen Li,Zhen Chen,Guoxiong Zhan,Bingling Yuan,Lidong Wang,Junhua Li
Catalytic amine-based solvent regeneration with solid acid is a feasible option for reducing energy consumption of CO 2 capture, but facing crucial challenges on designing material structures and understanding reaction mechanisms. Herein, we cover the nanoscale NiFe 2 O 4 cluster with covalent organic frameworks (COFs), to prepare solid acid catalysts. The pristine chemical bonds of Ni(Fe)-O and Ni(Fe)-Ni(Fe) are substituted by Ni(Fe)-N and Ni(Fe)-N-Ni(Fe) by targeting the anchoring of NiFe 2 O 4 cluster over COFs. The created coordination state stimulates the production of Brønsted acid sites. The obtained nanomaterials achieve a considerable improvement in CO 2 desorption of up to 290.1 mmol/(min·g) at 88 °C for spent monoethanolamine (MEA) solvent, representing a substantial increase of 540% relative to traditional thermal desorption. Consequently, the energy consumption of MEA generation is reduced by approximately 58%. Intermediate species (HCO 3− , CO 3 2− , and RNHCOO − ) and reaction pathways are established by combining operando Raman spectroscopy and ex situ 13 C NMR spectrum measurements. Theoretical calculations are performed to clarify the transformation mechanism of the acid sites around Ni/Fe atoms and its intrinsic role in the adsorption equilibrium of solvent regeneration.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Baoqiang Wang,Xiaochun Chen,Guangren Yu
A new class of biphasic system composed of tetraethylene pentaamine (TEPA), organic solvents and water is developed for capturing CO 2 , among which TEPA/Diethyleneglycolmonomethylether (DGME)/Water shows the best performance. When the TEPA/DGME/Water with mass ratio 3:3:4 is at 25 °C and atmospheric pressure, CO 2 absorption capacity reaches 1.89 mol CO 2 /mol amine (2.99 mol CO 2 /kg) after 50 mins, in which CO 2 rich phase accounts for 73%. The CO 2 desorption efficiency reaches about 97% at 130 °C and the CO 2 desorption energy consumption is 53.2%, 27.4% and 3% lower than that of MEA, TEEA/DEEA/Water and 0.5D1.5A3P respectively. The CO 2 cycle capacity is approximately 60% higher than that of traditional monoethanolamine (MEA)/1-propanol/Water biphasic absorbent. Compared with previously reported biphasic system, even with similar absorbent masses, the absorption equilibrium time is significantly shortened with competitive absorption capacity. This is a class of promising absorbent for capturing CO 2 .
研究领域:
化学工程
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Optoelectronics Letters
·
2021
·Vol. 17
·期 12
·751-756
·
IF 0
Yang Chen,Gu Weiyuan,Yu Shuguo,Zhang Hongyan
In this study, using surfactant monoethanolamine (MEA), zinc oxide (ZnO)-MEA humidity sensor based on ZnO was successfully prepared by hydrothermal method. MEA makes the surface of the ZnO-MEA have more oxygen vacancy and hydrophilic functional groups, which improves the performance of ZnO humidity sensor. ZnO-MEA achieved a change of 4 orders of magnitude at room temperature in the relative humidity (RH) from 11% to 95%, and it shows better linearity, shorter response/recovery time (20 s/15.9 s), smaller humidity lag and long-term stability. In addition, the distribution of ZnO-MEA particles is more uniform and provides more active sites for adsorption of water molecules to enhance humidity sensing performance.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
Journal of Energy Chemistry
·
2025
·
IF 14.9
Min Zhang,Zengyi Tan,Mufan Xing,Yang Wang,Xun Zhu,Qian Fu
The scaling-up of electrochemical CO 2 reduction requires circumventing the CO 2 loss as carbonates under alkaline conditions. Zero-gap MEA cell configurations with a proton exchange membrane represent an alternative solution in a pure acidic system, but the catalyst layer in direct contact with the hydrated proton environment usually leads to H 2 evolution dominating. Herein, we show that polydimethyldiallyl-ammonium-chloride-coated Ag (Ag@PDDA) electrode exhibits outstanding performance with a FE of 86%, a single-pass conversion of 72%, and a stability of 28 h for CO production in pure-acid MEA compared with ammonium poly(N-methyl-piperidine-co-pterphenyl) decorated Ag (Ag/QAPPT) and cetyltrimethylammonium bromide decorated Ag (Ag/CTAB). The in situ ATR-SEIRAS reveal that PDDA creates a positive charge-rich protective outer layer and an N-rich hybrid inner layer, which not only suppresses the migration of H + during the electrolysis process and blocks the direct contact between H 2 O and Ag catalyst, but also promotes the generation from CO 2 to *COOH in a pure-acid system. This work highlights the importance of polyelectrolyte engineering in regulating the electrocatalytic interface and accelerates the development of proton exchange membrane CO 2 electrolysis.
研究领域:
电化学
·
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiayi Hu,Juntao Huang,Xinwei He,Qi Luo,Chao'en Li,Changbo Zhou,Rui Zhang
The challenge for the carbon dioxide (CO 2 ) capture by using amine solution is the huge energy cost in solvent regeneration process, this work combined the advantages of three conventional amines, monoethanolamine (MEA), 1-Dimethylamino-2-propanol (1DMA2P), and piperazine (PZ) to formulate an effective trio-amine blend to capture CO 2 , and the results demonstrate that the blends could reduce the energy consumption by 29.4–55.4%, increase the average desorption rate by 60–140%, and increase the cyclic capacity by 40–120%, relative to 5 M MEA solution. Through analysis the regeneration mechanism in detail, it is found that more proton provider in the trio-amine blends could help to reduce the energy consumption by lower the reaction activation energy in the deprotonation process of the protonated amines. Finally compared to the reported amine systems in considering of the energy cost, it is found that the MEA-1DMA2P-PZ could be a potential candidate for capturing CO 2 in industrial.
研究领域:
化学工程
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Chengyuan Dong,Xinyao Wang,Zhipeng Zhu,Changhong Zhan,Xin Lin,Lingzheng Bu,Jinyu Ye,Yucheng Wang,Wei Liu,Xiaoqing Huang
Designing efficient formic acid oxidation reaction (FAOR) catalysts with remarkable membrane electrode assembly (MEA) performance in a direct formic acid fuel cell (DFAFC) medium is significant yet challenging. Herein, we report that the monoclinic-phased platinum–tellurium nanotrepang (m-PtTe NT) can be adopted as a highly active, selective, and stable FAOR catalyst with a desirable direct reaction pathway. The m-PtTe NT exhibits the high specific and mass activities of 6.78 mA cm–2 and 3.2 A mgPt–1, respectively, which are 35.7/22.9, 2.8/2.6, and 3.9/2.9 times higher than those of commercial Pt/C, rhombohedral-phased Pt2Te3 NT (r-Pt2Te3 NT), and trigonal-phased PtTe2 NT (t-PtTe2 NT), respectively. Simultaneously, the highest reaction tendency for the direct FAOR pathway and the best tolerance to poisonous CO intermediate can also be realized by m-PtTe NT. More importantly, even in a single-cell medium, the m-PtTe NT can display a much higher MEA power density (171.4 mW cm–2) and stability (53.2% voltage loss after 5660 s) than those of commercial Pt/C, demonstrating the great potential in operating DFAFC device. The in-situ Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy jointly demonstrate that the unique nanostructure of m-PtTe NT can effectively optimize dehydrogenation steps and inhibit the CO intermediate adsorption, as well as promote the oxidation of noxious CO intermediate, thus achieving the great improvement of FAOR activity, poisoning tolerance, and stability. Density functional theory calculations further reveal that the direct pathway is the most favorable on m-PtTe NT than r-Pt2Te3 NT and t-PtTe2 NT. The higher activation energy to produce CO and the relatively weaker binding with CO of m-PtTe NT result in the better CO tolerance. This work achieves remarkable FAOR and MEA performances of advanced Pt-based anodic catalysts for DFAFCs via a phase engineering strategy.
研究领域:
材料科学
·
电化学
·
催化
·
燃料电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zixin Lv,Ning Zhao,Meizi He,Qing Ju,Ge Chao,Yixin Wang,Kang Geng,Hongying Tang,Nanwen Li
Phosphoric acid (PA) leakage of PA-doped high-temperature proton exchange membranes (HT-PEMs) is pivotal for its practical application under working conditions. Here, to enhance the PA retention of HT-PEMs, the concept of microphase separation regulated by flexible long aliphatic side-chain was introduced into poly(isatin-co-p-terphenyl-imidazole) matrix (PITI-CmQ90) via direct superacid-catalyzed copolymerization from N-alkylated isatin monomer . The designed PITI-CmQ90 membranes illustrate obvious microphase separation and larger ionic domain confirmed via Small-angle X-ray scattering (SAXS) analysis suggesting wider proton transport channels. Notably, PA/PITI-C6Q90 membrane exhibits the best PA retention ability under relative humidity (RH) cycle tests at different temperatures, which mainly attributed to the excellent PA interaction through moderate ion aggregation in the microphase-separated PEM matrix verified by solid 31 P NMR. As a result, the corresponding MEA displays the most durable single-cell performance under a step-V procedure from 1.0 V to 0.1 V cycle experiments at different temperatures. Therefore, the idea of microphase separation structure on PA retention mentioned in this work helps to study the ionic-pairs interactions from the perspective of membrane microstructure and provide a new strategy to enhance the durability of PEMs.
研究领域:
材料科学
·
化学工程
·
电化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Sen Qin,Shanshan Dai,Wei Fan,Mei Li,Zou He,Jie Qi,Yang Yang,Huan Yan
To achieve excellent absorptive loading and low viscosity, a novel amino-functionalized ionic liquid [G1.0 PAMAM] [2-MI] combined with water for CO 2 capture is proposed in this work. The concentration of [G1.0 PAMAM] [2-MI], absorption temperature, and aeration rate were optimized by using Response Surface Methodology based on Box-Behnken design, and the model predictions were in good agreement with the experimental data. The results illustrated that the absorption loading of 42.71 wt% [G1.0 PAMAM] [2-MI]/H 2 O was 6.81 mol CO 2 /mol ILs (38.5°C, 100 mL/min), which was much higher than that of MEA /H 2 O, and the regeneration efficiency was maintained at 89.5 % after the eighth regeneration cycle. With the combined effect of 2-MI and water, the viscosities of the solution before and after absorption at 40°C were 35.3 and 53.8 mPa·s, respectively, which were significantly lower than those of the majority of ionic liquid absorbents. The reaction mechanism of [G1.0 PAMAM] [2-MI] with CO 2 was demonstrated by 13 C NMR to be a synergistic combination of a zwitterionic mechanism and a base-catalyzed hydration mechanism to produce carbamate and carbonate/bicarbonate (CO 3 2– /HCO 3 – ).
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Kun Fu,Pan Zhang,Dong Fu
The absorption amount ( m ) and loading ( α ) of CO 2 in 2-(ethylamino)ethanol (EAE) activated 3-(dimethylamino)propan-1-ol (3DMA1P) aqueous solution were measured. The temperatures ranged from 303.2 K to 323.2 K. The mass fractions of 3DMA1P and EAE respectively ranged from 0.3 to 0.5 and 0.01 to 0.03. The effects of temperature ( T ) and mass fractions of amines ( w ) on the absorption performance were illustrated. It’s impressive that the addition of very small amounts of EAE into 3DMA1P aqueous solution significantly enhanced the absorption performance. Moreover, comparison showed that 3DMA1P-EAE aqueous solution appeared much higher CO 2 absorption capacity than the widely used MDEA-MEA aqueous solution. Tray towers with different plates ( N p = 6, 8 and 10) were used to verify the removal efficiency of CO 2 ( η CO 2 ) and the effects of gas flow rate ( G ), absorbent flow rate ( L ), w , absorbent feed temperature ( T ) and N p on η CO 2 were illustrated. Our results showed that when composed of 30% to 50% (mass percent) 3DMA1P and 3% EAE, the absorbents achieved η CO 2 higher than 90%, which met the efficiency requirement specified in a power plant, thus leading to a promising industrial application in the CO 2 capture process.
研究领域:
化学工程
·
环境科学
·
碳捕集与封存
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE
·
2021
·Vol. 47
·期 6
·1-10
·
IF 4.101
Xinyan Ma,Ying Zhang,Mingyang Guan,Weidong Zhang,Huifang Tian,Caixiao Jiang,Xiaoxin Tan,Weijun Kang
The toxicity of chloroacetamide herbicide in embryo development remains unclear. Acetochlor (AC) is a chloroacetamide that metabolizes into 2‑ethyl‑6‑methyl-2-chloroacetanilide (CMEPA) and 6‑ethyl‑o‑toluidine (MEA). The present study determined the potential effect of AC and its metabolites on embryo development. Both HepG2 cells and zebrafish embryos were exposed to AC, CMEPA and MEA in the presence or absence of co‑treatment with anti‑reactive oxygen species (ROS) reagent N‑acetylcysteine. The generation of ROS, levels of superoxide dismutase (SOD) and glutathione (GSH) in HepG2 cells and lactate dehydrogenase (LDH) leakage from HepG2 cells were investigated. The effects of AC, CMEPA and MEA on DNA breakage, MAPK/ERK pathway activity, viability and apoptosis of HepG2 cells were examined by comet assay, western blotting, MTT assay and flow cytometry, respectively. Levels of LDH, SOD and GSH in zebrafish embryos exposed to AC, CMEPA and MEA were measured. The hatching and survival rates of zebrafish embryos exposed to AC, CMEPA and MEA, were determined, and apoptosis of hatched fish was investigated using acridine orange staining. The present data showed AC, CMEPA and MEA induced generation of ROS and decreased levels of SOD and GSH in HepG2 cells, which in turn promoted DNA breakage and LDH leakage from cells, ultimately inhibiting cell viability and inducing apoptosis, as well as phosphorylation of JNK and P38. However, co‑treatment with N‑acetylcysteine alleviated the pro‑apoptosis effect of AC and its metabolites. Moreover, exposure to AC, CMEPA and MEA lead to toxicity of zebrafish embryos with decreased SOD and GSH and increased LDH levels and cell apoptosis, ultimately decreasing the hatching and survival rates of zebrafish, all of which was attenuated by treatment with N‑acetylcysteine. Therefore, AC and its metabolites (CMEPA and MEA) showed cytotoxicity and embryo development toxicity.
研究领域:
毒理学
·
分子生物学
·
发育生物学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）