CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jing Ouyang,Chenghui Zheng,Wei Gu,Yi Zhang,Huaming Yang,Steven L. Suib
To understand the effect of porous parameters and chemical components on CO 2 capturing performance of solid state amine absorbents and their kinetic parameters, a clay mineral-based CO 2 absorbent was prepared by impregnating five different liquid amines onto SiO 2 nanowire clusters from fibrous sepiolite (Sep). Characterization was conducted by XRD, SEM, FTIR, and N 2 adsorption–desorption isotherm, CO 2 adsorption performances were measured by TGA. After acid treatment, the raw Sep mineral changed into amorphous silica nanowires, and the largest S BET of the obtained SiO 2 nanowires reached 320 m 2 /g, which was 8 times larger than the pristine mineral. Amongst the adapted amines, tetraethylenepentamine (TEPA) showed superiority in the CO 2 adsorption capacity. The optimized adsorption capacity reached 3.7 mmol/g at 75 °C from a CO 2 + N 2 mixture on a ∼50 wt% TEPA loaded SiO 2 sample, and the capacity remained 3.6 mmol/g after ten circles of adsorption/desorption tests. The pore size and pore structure of the matrix, rather than the surface area, will obviously affect the adsorption ability of the product. Kinetic parameters for the CO 2 adsorption process fitted well with a fractional-order model, confirming that the CO 2 adsorption process by the solid absorbent should be a combination of both physical and chemical reactions. Results in this article provide detailed parameters for preparing and understanding these clay mineral based solid state CO 2 absorbents.
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MATERIALS CHEMISTRY AND PHYSICS
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2017
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IF 2.084
Yisong Wang,Tao Du,Ziyang Qiu,Yanli Song,Shuai Che,Xin Fang
Mesoporous ZSM-5 zeolite as the adsorbent supporting material was synthesized from rice husk ash (RHA), and then impregnated with polyethylenimine (PEI) for amine functional modification. A series of adsorbents (ZSM-5-PEI-X) with different PEI loading ratios were characterized by XRD , FTIR , TGA/DTG, nitrogen adsorption-desorption, SEM and EDX techniques. The measurement of the adsorption capacity at different temperatures was indicated that ZSM-5-PEI-30 had the highest adsorption capacity at 120 °C (1.96 mmol/g). The experimental data were fitted by adsorption kinetic models and isotherm models, indicated that fractional-order model and the Dual-site langmuir model can be used to describe the adsorption mechanism and predict the adsorption performance. The high CO 2 adsorption selectivity and regeneration stability suggested that this adsorbent is a potential candidate in the adsorption and separation of CO 2 in industrial flue gas .
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ChemSusChem
·
2024
·Vol. 17
·期 16
·e202301951
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IF 7.5
Kaili Wang,Zhaowei Zhang,Shenyao Wang,Lili Jiang,Haoran Li,Congmin Wang
Graphical CO 2 absorption capacity, desirable absorption enthalpy and excellent reversibility were achieved through dual-tuning azole-based ionic liquids for CO 2 capture from ambient air A strategy of tuning azole-based ionic liquids for reversible CO 2 capture from ambient air was reported. Through tuning the basicity of anion as well as the type of cation, an ideal azole-based ionic liquid with both high CO 2 capacity and excellent stability was synthesized, which exhibited a highest single-component isotherm uptake of 2.17 mmol/g at the atmospheric CO 2 concentration of 0.4 mbar at 30 °C, even in the presence of water. The bound CO 2 can be released by relatively mild heating of the IL-CO 2 at 80 °C, which makes it promising for energy-efficient CO 2 desorption and sorbent regeneration, leading to excellent reversibility. To the best of our knowledge, these azole-based ionic liquids are superior to other adsorbent materials for direct air capture due to their dual-tunable properties and high CO 2 capture efficiency, offering a new prospect for efficient and reversible direct air capture technologies.
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Molecular Catalysis
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2024
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IF 3.9
Yingfang Nie,Yu Mei,Youcai Zhu,Yue Mu,Yulong Wu,Li Sun,ZhenHao Xi,Zhen Liu
The copolymerization of carbon dioxide (CO 2 ) and propylene oxide (PO) catalyzed by diethyl zinc/glycerol has been studied by experimental and theoretical approaches. The efficiency of the catalyst is strongly determined by the preparation methods, as the catalyst showed high activity when the catalyst was prepared by dropping glycerol into diethyl zinc. Conversely, the catalyst showed almost no activity when the dropping order was reversed. The order of dropwise addition could change the reaction between diethyl zinc and glycerol, which affects the structure of the catalyst and leads to a change in the catalytic activity. DFT calculations showed that the catalyst is self-assembled and the copolymerization follows a bimetallic coordination-push mechanism.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Bin Jiang,Tong Lei,Weida Chen,Meisi Chen,Chen Lu,Feng Zhang,Zhibing Zhang
Due to the proton transfer between aqueous solution of protic ionic liquids (PILs) and N,N,N’,N’-tetramethyl-1,6-hexanediamine (TMHDA), the liquid–liquid phases are gradually transformed into one phase during the absorption which is restored to two phases by carbon dioxide desorption, thus both the absorption and desorption processes were effectively intensified by phase conversion. The experimental results showed that CO 2 load of TPH (composed of TMHDA, PILs and H 2 O) was 45% higher than that of PILs-H 2 O, as well as an obvious increase of absorption rate. Moreover, the regeneration energy consumption of TPH was only 2.10 GJ/tonCO 2 . The spectral analysis and molecular dynamics simulations revealed that the proton transfer was the key of phased conversion, and it was regulated by the synergistic interaction between PILs and TMHDA during the CO 2 capture process. This kind of phase conversion strengthening absorbent with low viscosity is a useful way to achieve low energy carbon dioxide capture.
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FUEL
·
2025
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IF 7.5
Honglin Li,Xin Zhang,Yuanyuan Wen,Jingyuan Li,Yu Liu,Hongjun Mao,Hongman Sun,Jingbin Zeng,Zifeng Yan
Sulfur-doped copper (S-doped Cu) was regarded as an efficient catalyst for formate in CO 2 electrochemical reduction reaction (CO 2 RR), but the selectivity and current density are still unsatisfied due to the hydrogen evolution reaction (HER) and CO generation pathway. Herein, S-doped Cu nanoparticles were synthesized by in-situ reduction of the constructed Cu-thioamide coordination polymers, exhibiting impressive performance for formate production in the CO 2 RR process. Particularly, the CuBr-thiobenzamide (TBA) coordination polymers derived S-doped Cu nanoparticles (CuBr-TBA-R) achieve a formate Faradaic efficiency of 84.4 % with current density of formate to 6.7 mA cm −2 . The characterization results indicate these generated S-doped Cu nanoparticles are uniform with the particle size of 20–30 nm exposed a large amount of Cu (100) facets due to the coordination of thioamide molecules and presence of Br - and I - in electrolyte. The morphological characteristics and strong affinity for oxygen is the reason of higher formate selectivity and current density. This finding reveals the characterizations of efficient S-doped Cu catalysts for formate and provide a controllable approach to prepare these catalysts.
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JOURNAL OF POROUS MATERIALS
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2025
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IF 3.2
Xiong Qingxing,Yu Lingling,An Ning,Cong Hang,Zhao Wenfeng
Conversion of greenhouse gas carbon dioxide to valuable products is important to reach carbon balance and sustainability, of which catalytic cycloaddition of CO 2 to cyclic carbonates has attracted much attention. Here, a biomass-derived zwitterionic polymer has been synthesized and characterized. The prepared polymer with porous structure was employed for the catalytic cycloaddition of atmospheric CO 2 and epoxides in excellent yields with a broad substrate scope under solvent-, co-catalyst, and metal-free conditions. The synthesized polymer with good thermostability could be readily recovered and recycled four times at least. Moreover, this catalytic system provided satisfactory performance with up to 96% yield of cyclic carbonate even in the gram-level scale-up reaction under the optimal standard conditions. The catalytic mechanism has also been preliminarily discussed.
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Catalysts
·
2024
·Vol. 14
·期 6
·335
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IF 3.8
Peng Jiang,Yang Yu,Kun Wang,Wenrui Liu
Excessive emissions of carbon dioxide have led to the greenhouse effect and global warming. Reducing carbon dioxide into high-value-added chemicals through solar energy is a promising approach. Herein, a g-C3N4/TiO2heterojunction photocatalyst with efficient electron transfer is designed for photocatalytic CO2reduction. The CH4(18.32 µmol·h−1·g−1) and CO (25.35 µmol·h−1·g−1) evolution rates of g-C3N4/TiO2are higher than those of g-C3N4and TiO2. The enhanced photocatalytic CO2reduction performance is attributed to the efficient charge carrier transfer in the g-C3N4/TiO2heterojunction. The electron transfer route was verified by in situ irradiated X-ray photoelectron spectroscopy (XPS). The photocatalytic CO2reduction mechanism on g-C3N4/TiO2was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This work provides a strategy for designing a polymer/metallic oxide heterojunction with efficient electron transfer for enhanced photocatalytic CO2reduction.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Duoyong Zhang,Chen Zhang,Xinqi Zhang,Yongqiang Tian,Xusheng Cheng,Xuancan Zhu,Liwei Wang
To enhance CO 2 sorption efficiency under low-pressure conditions and effectively compete with N 2 sorption in flue gas, modifications are implemented aimed at improving the adsorption capacity and selectivity of ZIF-8, renowned for their robust stability. Deep eutectic solvent (DES) comprising tetraethylammonium chloride (TEAC), tetrapropylammonium chloride (TPAC), and tetrabutylammonium bromide (TBAB) as hydrogen-bond acceptors, along with ethanolamine (MEA) as the hydrogen-bond donor, were meticulously prepared for this purpose. ZIF-8 underwent modification through DES loading, resulting in the distinctive emergence of a “core-membrane” structure. Characterization revealed that the DES effectively adhered to the surface of ZIF-8 in a membrane-like structure, without altering the chemical structure or pore size of ZIF-8. The most significant enhancement in sorption capacity was observed with TPAC&MEA modification. Considering the presence of N 2 partial pressure in the flue gas, at 0.05 and 1 bar, the CO 2 adsorption capacities reached 1.92 and 3.03 mmol g −1 , respectively, increasing 71.11 and 4.00 times compared to pristine ZIF-8. The ZIF-8 exhibited a CO 2 /N 2 separation coefficient of 72.77, which increased to a maximum of 997.50 after DES modification. Additionally, the modified material demonstrated exceptional cyclic and thermal stability during testing. This study significantly elevates the CO 2 adsorption capacity and selectivity of solid materials within the low-pressure range, providing pivotal support for CO 2 capture and decarbonization efforts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Dandan Liu,Jinghao Hua,Weijie Zhang,Kai Wei,Shushan Song,Qianyu Wang,Ziheng Song,Huarui Han,Changchang Ma,Sheng Feng
Building efficient catalysts is an urgent issue in the field of photocatalytic CO 2 reduction, and Z-scheme heterojunction structures can availably suppress the recombination of photo generated carriers and improve photocatalytic performance. This study successfully prepared a new type of Bi 4 O 5 Br 2 /Bi-MOF composite photocatalyst through self-assembly method. After 5 h of simulated sunlight exposure, the optimized sample 50-Bi 4 O 5 Br 2 /Bi-MOF photocatalytic reduction of CO 2 to CO efficiency (23.78 μmol·g −1 ·h −1 ) was 5.09 times higher than pure Bi 4 O 5 Br 2 , and the CH 4 yield (5.39 μmol·g −1 ·h −1 ) was 2.52 times that of pure Bi-MOF. In addition, in the cyclic experiment, the catalyst had high stability and reusability. The Z-scheme charge transfer mechanism was confirmed through band structure analysis, Electron spin resonance (ESR), Ultraviolet photoelectron spectroscopy (UPS) and other related characterizations. This work provided an important strategy for designing efficient Z-scheme heterojunction photocatalysts.
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ACS Omega
·
2024
·
IF 3.7
Xinyue Chen,Yongkang Cui,Shujuan Wang
In the realm of postcombustion carbon capture, diethylenetriamine (DETA), recognized for its substantial CO2 absorption capacity, presents a formidable challenge due to its corrosive impact on equipment. This study delves into the corrosion behavior of 20# carbon steel immersed in DETA solutions under varying conditions, employing weight loss and electrochemical methods. The investigation incorporates scanning electron microscopy/energy-dispersive spectroscopy and X-ray diffraction analyses for characterization. Corrosion experiments were also conducted in monoethanolamine (MEA) solutions for a comparative analysis. Results from the corrosion tests in DETA solutions mirror the temperature-dependent corrosion rate (CR) observed in MEA. However, a distinctive trend emerges as the CO2 loading of DETA increases from 0.2 mol CO2/mol amine to 1.2 mol CO2/mol amine, leading to a continuous decrease in the CR of carbon steel─contrary to MEA solutions. This anomaly is attributed to DETA’s robust complexing ability with metal ions and its elevated solubility of Fe2+ in solution. Additionally, an examination of the corrosion mechanism in the presence of oxygen was conducted through characterizing the specimen surface and solution precipitates postexperiment. The absence of a protective FeCO3 layer can be attributed to insufficient concentrations of free Fe2+ and CO32– in the solution, failing to achieve the minimum saturation required for protective film formation. The insights gained from studying the corrosion behavior of carbon steel in DETA solutions lay the groundwork for subsequent developments in corrosion inhibitors.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2024
·
IF 5.9
Maomao Liu,Guizeng Liang,Ningce Zhang,Tao Li,Lipeng Diao,Ping Lu,Xiaoliang Zhao,Daohao Li,Dongjiang Yang
Rationally constructed new catalyst can promote carbon dioxide reduction reaction (CO 2 RR) to valuable carbonaceous fuels such as formate and CO, providing a promising strategy for low CO 2 emissions. Herein, the synthesized Ni 3 S 2 @C as a highly efficient electro-catalyst exhibits remarkable selectivity for formate with 73.9% faradaic efficiency (FE) at −0.7 V vs. RHE. At high applied potential, it shows a high syngas evolution with CO/H 2 ratios (0.54–3.15) that are suitable for typical downstream thermochemical reactions . The experimental and theoretical analyses demonstrate that the electron-rich Ni 2+ in Ni 3 S 2 enhances the adsorption behavior of ∗ OCHO intermediate, reduces the energy barrier of the formation of intermediates, and improves the selectivity of the formate product. Attenuated total reflection surface-enhanced infrared absorption spectra conducted in situ show that ∗ OCHO intermediate is more likely to be generated and adsorbed on Ni 3 S 2 , enhancing the selectivity and activity of the formate product.
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