LANGMUIR
·
2018
·
IF 3.789
Dongfang Liu,Zhiyu Huang,Yuxin Suo,Peiyao Zhu,Jiang Tan,Hongsheng Lu
A surfactant-free microemulsion (SFME) with CO2 stimuli responsive properties was prepared. The oil and the water phases were N,N-dimethylcyclohexylamine (DMCHA) and deionized water, respectively, and N,N-dimethylethanolamine was used as an amphisolvent. The single-phase and multiphase zones were measured by the ternary-phase diagram, and the microstructure of the SFME was determined by measuring the change trend of the electrical conductivity of the system with increasing DMCHA content. While using methyl orange as a probe, the microstructure of the SFME was further confirmed by an UV–visible spectrometer. The microstructures of water-in-oil (SFME-I) and oil-in-water (SFME-II) microemulsions were obtained by changing the DMCHA content in the system. The SFME-I system has a significant phase separation after the action of CO2. However, with the continuous introduction of CO2, the upper phase of DMCHA is gradually protonated and dissolves in the aqueous phase, resulting in a gradual decrease in the volume of the upper phase, and eventually in an aqueous solution of ammonium bicarbonate. For SFME-II, CO2 does not directly cause phase separation, but eventually it becomes an aqueous solution of ammonium bicarbonate with the addition of CO2. Both the water-in-oil structure SFME-I and the oil-in-water structure SFME-II have excellent CO2 stimuli responsive performance.
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高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Peng Zhu,Yi Guo,Ying Zhang,Siqi Wu,Rongyuan Wang,Zhanbo Si,Xiaojie She,Yilin Deng,Qing Yu
The electrocatalytic reduction of industrially diluted CO2 streams (5–30%) represents a pivotal avenue for carbon resource utilization. However, its practical implementation has long been hindered by mass transfer limitations and competitive hydrogen evolution reactions under low CO2 concentrations. Current research has largely focused on pure CO2 systems, overlooking the mechanistic intricacies of *CO intermediate dynamics and C–C coupling efficiency in CO2-deficient environments. To address this challenge, this study developed compositionally tunable core–shell Ag@(Cu2O)x catalysts via a seed-mediated growth approach, enabling precise modulation of the Cu2O/Ag ratio (x = 0.14–5.0) to optimize the interplay between *CO intermediates and C–C coupling under diluted conditions. Notably, experimental results demonstrate that the Ag-rich Ag@(Cu2O)0.75 catalyst achieves a Faradaic efficiency for ethylene (FEC2H4) exceeding 45% under 25% CO2. While the Cu2O-rich Ag@(Cu2O)3.0 catalyst, although optimal in pure CO2 systems, fails under the same diluted conditions due to insufficient *CO supply. This discovery underscores the pivotal role of *CO supply in dictating the overall catalytic efficiency and product distribution pathways during low-concentration CO2 electrocatalytic processes.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yifan Zhang,Longchun Zhong,Rashid M.Othman,George P. Lithoxoos,Ali Nabeeh Shakhs,Faiz Almansour,Xi Zeng,Wei-Ping Pan
This study evaluated zeolite-templated carbon (ZTC) and soft-templated carbon (STC) for direct air capture (DAC) of CO 2 , examining their synthesis, structural features, adsorption performance, and potential for industrial use. ZTC was produced through chemical vapor deposition using 13× zeolite, revealing a microporous structure (0.72–1.41 nm) and a specific surface area of 2815 m 2 /g. Conversely, STC prepared via a dual-template glucose system demonstrated a hierarchical pore structure (0.69 nm ultra-micropores and 3.05 nm mesopores) with a surface area of 838 m 2 /g. Under pure CO 2 conditions, both materials had similar adsorption capacities (2.16 mmol/g and 2.09 mmol/g, respectively). However, at 400 ppm CO 2 , STC outperformed ZTC (0.013 mmol/g vs. 0.0107 mmol/g) due to its radially oriented pores and hollow cavities, which created an “adsorption-enrichment” pathway, thereby improving low-concentration CO 2 uptake. Under humid conditions (RH = 75%), both materials exhibited two-stage adsorption kinetics, starting with rapid physical adsorption of CO 2 , followed by a water-driven carbonation reaction. Water blocking the hierarchical pores and cavities reduced the adsorption efficiency of STC due to its hydrophilic surface. In contrast, ZTC maintained strong physical adsorption and carbonation reactions in humid environments. Additionally, ZTC's lower cost ($29.60/kg vs. $44.36/kg for STC), scalability, and humidity tolerance make it more suitable for industrial CO 2 capture.
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Energy & Environmental Materials
·
2026
·
IF 13.8
Eunchae Oh,Jaewon Jang,Yoon Kyeung Lee,Junghoon Yang,Byung-Joo Kim,Jungpil Kim
The direct conversion of CO 2 into high-quality carbon nanotubes (CNTs) remains a formidable challenge, primarily due to the oxidation of metal catalyst by the oxidative nature of CO 2 . To overcome this limitation, a tandem catalytic system was implemented, in which CO 2 was converted to produce CH 4 on Ni catalysts in the primary reactor, and the CNT was synthesized from CH 4 on an Fe catalyst in the secondary reactor. Nevertheless, unreacted CO 2 was introduced into the secondary reactor, where the Fe catalysts were oxidized and thus failed to produce any solid carbon. To prevent the oxidation of Fe catalysts, a bimetallic Fe–Mo catalyst was employed instead of pure Fe. Mo was partially converted to Mo 2 C by reacting with unreacted CO 2 , which effectively suppressed the oxidation of Fe, thereby stabilizing the active Fe phase. This transformation was further corroborated by XPS analysis, where the Mo 3d spectra exhibited an increased Mo 2+ peak intensity, whereas the Fe 2p spectra showed a stronger metallic Fe signal, confirming that Mo incorporation inhibited Fe oxidation. However, excessive Mo loading resulted in the formation of multi-walled CNTs instead of single-walled CNTs, as evidenced by the reduced selectivity toward radial breathing modes in the Raman spectra and the broader diameter distribution observed in TEM measurements. These findings underscore the critical role of Mo in preserving Fe activity under oxidizing conditions and highlight the importance of optimizing its content, as an appropriate Mo level enables the selective synthesis of high-quality single-walled CNTs from CO 2 via a dual-step tandem process.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Xia Gui,Wei Wang,Qiang Gao,Zhi Yun,Maohong Fan,Zuhua Chen
An analytical apparatus with improved recirculating and sampling mechanisms was presented to investigate phase behavior of binary and multicomponent systems, which effectively avoided undesirable pressure gradients across the cell and serious disturbance of equilibrium during sampling procedure. Two one-channel magnetic recirculation pumps were designed and built to provide better mass transfer between the coexisting phases. Two six-port switching valves were used for sampling, quantitative fluid injection, and online compositional analysis by gas chromatography. The apparatus was validated by means of isothermal vapor–liquid equilibrium data for CO2 + hexane, and the results were found to be in good agreement with the literature data. High pressure phase equilibria data of CO2 + n-alkanes and CO2 + crude oil + n-alkanes were measured from 353.15 to 373.15 K. Three thermodynamic models of RR, PRSV, and YQE, based on Peng–Robinson and a modified quartic equation of state coupled with various mixing rules, were suggested to represent phase equilibrium. Calculations were compared with experimental values for evaluating the predictive ability of these proposed equations. Analysis of the results confirmed that the YQE model was superior to all the other equations examined and worked well in describing phase behavior of complex real fluids.
研究领域:
化学工程
·
热力学
·
石油工程
·
相态行为
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zucheng Cheng,Weiguo Liu,Shaohua Li,Sijia Wang,Yingying Liu,Xiang Sun,Cong Chen,Lanlan Jiang,Yongchen Song
Hydrate technology with high gas storage capacity and excellent safety features has attracted much attention for capturing CO 2 from biogas to produce purified CH 4 . When considering operational efficiency, it is desirable to overcome technical barriers such as slow hydrate generation and low separation efficiency. Therefore, based on the properties of surfactant-enhanced hydrate generation kinetics, this work first systematically evaluated the performance of 500 ppm SDS on the separation efficiency of 40 mol% CO 2 and 60 mol% CH 4 simulated biogas. The experimental results show a significant increase in gas capture at higher driving forces, with the rise being dominated by the CH 4 component, indicating that larger driving forces reduce hydrate selectivity to CO 2 -CH 4 and weaken gas separation efficiency, with a maximum CO 2 recovery of 84.24 ± 1.19% at 275.15 K and 8 MPa. Interestingly, hydrate growth mainly occurred in the liquid phase, leading to the separation factor being positively correlated with the induction time with sufficient CO 2 dissolution. In comparison, the gas capture per unit volume of solution could be improved by more than a factor of 2 at higher gas–liquid ratios. The best separation factor of 7.84 ± 0.73 was achieved, and separation factors in general gradually decreased with increasing gas–liquid ratio; however, there was high-pressure failure behavior. Furthermore, the impact of the defoamer on separation efficiency was deeply investigated for SDS decomposition foaming, with results showing that the defoamer would alleviate hydrate decomposition foaming behaviour while having no significant effect on hydrate generation kinetics and separation efficiency.
研究领域:
能源工程
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环境科学
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化学工程
·
气体分离技术
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高影响因子
C-Journal of Carbon Research
·
2025
·Vol. 11
·期 4
·75
·
IF 2.9
Miaomiao Ye,Jingqiu Wu,Qiuyuan Weng,Tengchao Bi,Xiaowei Liu
The utilization of carbon dioxide (CO2) offers an effective approach for alleviating the carbon-reduction pressures associated with fossil energy consumption. However, studies on the use of CO2as an auxiliary agent in water treatment to enhance the removal of emerging contaminants are limited. In this study, the photodegradation of ciprofloxacin (CIP) was investigated using ultraviolet (UV) irradiation combined with CO2dosing (UV/CO2). The results demonstrated that the UV/CO2system effectively degraded CIP, with CO2concentration and solution pH exerting a critical influence. Inorganic anions and metal cations had negligible effects on CIP degradation efficiency, whereas natural organic matter (NOM) had a pronounced inhibitory effect. Mechanistic analysis revealed that superoxide radicals (·O2-) and carbonate radicals (CO3•-) were the primary oxidizing species, whereas the excited triplet state of CIP (3CIP*) and singlet oxygen played crucial roles in initiating radical generation. LC–MS analysis and density functional theory calculations indicated that the main degradation routes involved defluorination, decarboxylation, and epoxidation of the piperazine ring. Toxicity assessment indicated that the transformation products generated by UV/CO2were less toxic than the parent compound. Furthermore, the UV/CO2process demonstrated high energy efficiency, with a low electrical energy per order (EEO) value of 0.4193 kWh·m−3·order−1. These findings suggest that the UV/CO2system is a promising alternative for the treatment of photosensitive organic pollutants and provides a beneficial pathway for CO2utilization.
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高影响因子
PETROLEUM CHEMISTRY
·
2025
·
IF 1.1
Jiang Ning,Mao Min,Wang Qingyin,Wang Gongying
MOF-5 is a classic metal-organic framework (MOF) crystal. However, synthesis of high-quality crystals usually requires an expensive N , N ′-diethylformamide (DEF) solvent, and a high molar ratio of a raw material (Zn 2+ : BDC 2– = 3‒5 : 1). More critically, its extreme instability against water vapor has caused researchers to do not use it. In this study, we achieved some important breakthroughs by using inexpensive N , N ′-dimethylformamide (DMF) solvent and meticulously optimizing synthesis parameters combined with a specialized micro-open solvothermal method. With a reduced molar ratio of a raw material (1.47 : 1), we successfully synthesized crystals exhibiting excellent phase structure and morphology, high surface area, out standing water vapor stability, and strong CO 2 adsorption capacity. The results show that the DEF replacement with DMF and reduction of the raw material molar ratio from 3 : 1 to 1.47 : 1 provides an increase of the BET surface area from ~935 to 2388 m 2 /g, and an improvement of the CO 2 adsorption capacity from ~0.8 to 2.5 mmol/g (298 K, 100 kPa). Breakthrough curves reveal that in simulated separation experiments for the flue gas and natural gas containing low CO 2 concentrations (10‒20%), the dynamic separation selectivity for CO 2 /N 2 reaches 22, while that for CO 2 /CH 4 remains stable at 4. Notably, the selectivity remained nearly unaffected by the pressure variation; this phenomenon is promising for enhancing the capture and purification of a low-concentration CO 2 from the flue gas and natural gas. It is important that the improved MOF-5 crystals prepared under optimal synthetic conditions maintained the stable phase structure and morphology even after 14-day exposure to humid air (relative humidity >70%), successfully overcoming the challenge posed by a water vapor.
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高影响因子
FUEL
·
2022
·
IF 8.035
Qixin Yuan,Yongsheng Zhang,Tao Wang,Jiawei Wang,Carlos E. Romero
The accelerated mineralization of fly ash is a potential way to achieve CO 2 emissions reduction. However, the slow reaction at the diffusion control stage is the bottleneck. Due to the strong diffusion of supercritical CO 2 , it has been to strengthen mineralization, but the degree of improvement in mineralization efficiency and the changes that take place in the transition from non-supercritical to supercritical CO 2 are not clear. In the mineralization process, CaO in the ash reacts with CO 2 to form CaCO 3 . In order to exclude the influence of other alkaline oxides, powdered and block CaO were used to research the mechanism, and experiments were then carried out on samples of fly ash with different CaO content. Firstly, powdered CaO was used to conduct dry and wet mineralization experiments. In dry mineralization, the mineralization efficiency of the process changes in two stages as the pressure increases, first undergoing a gentle-increase and then a rapid one. Diffusion depth experiments on block CaO show that the supercritical diffusion depth is higher than the non-supercritical diffusion depth by a factor of 1.22, indicating that supercritical CO 2 can improve the degree of mineralization in diffusion stage. The presence of water could promote mineralization. In wet mineralization, the efficiency of the process changes in three stages as the pressure increases, with first a gentle increase then a more rapid one and finally an attenuated rate of increase. The supercritical mineralization efficiency at 8 MPa was 55.27%, a factor of 2.09 larger than for non-supercritical mineralization at 3 MPa (26.39%). This is because that supercritical CO 2 has increased the diffusion and greatly improved solubility in water. The results of DFT calculations show that H 2 O can promote the adsorption of CO 2 by CaO, which is one of the reasons why water promotes mineralization. Finally, wet mineralization experiments on fly ash show that at 8 MPa, the mineralization efficiencies of HB, SD, SX and YN fly ashes are 1.94, 1.30, 2.03 and 1.62 times their values at 3 MPa. Although the difference in efficiency is affected by the CaO content, supercritical CO 2 can effectively improve the mineralization efficiency.
研究领域:
环境科学
·
碳捕集与封存
·
材料化学
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Junyan Liu,Tao Shao,Xun Peng,Shengwei Liu
Electrochemical CO 2 reduction reaction (CO 2 RR) is a potential strategy for mitigating severe greenhouse effect. Despite its potential, CO 2 RR encounters critical challenges to convert low CO 2 concentrations in practical scenarios, due to the CO 2 mass transfer limitations. Herein, we prepared a reduced 2-aminoterephthalic acid modified bismuth coordination compound (Re-BiBDC-NH 2 ) for CO 2 RR in low CO 2 concentrations. Retained amino groups after in situ reduction induce abundant unsaturated coordination sites, enhancing CO 2 adsorption and enabling localized concentration enhancement even under low CO 2 supply concentrations. As such, the optimized Re-BiBDC-NH 2 achieves a Faradaic efficiency for formate (FE formate ) of > 80% at a wide potential range of 700 mV, FE formate of >75% across 15%–100% CO 2 concentrations. Furthermore, in a flow cell at a current density of 300 mA cm⁻ 2 and across a wide pH range (pH = 1.7, 7, and 14), the Re-BiBDC-NH 2 catalyst achieved FE formate > 95%, with a single-pass carbon efficiency (SPCE) reaching 71.6% in acidic electrolyte (pH = 1.7). In situ spectroscopies and Density functional theory calculations reveal that dynamically frustrated Lewis pairs formed by amino groups and defects concentrate CO 2 , and stabilize *OCHO intermediates to reduce energy barriers, thereby not only enhancing the CO 2 RR performance but also allowing reaction to operate under low CO 2 concentrations. This work presents a promising ligand-defect synergistic catalyst for low-concentration CO 2 RR, offering insights for bridging catalyst research and practical CO 2 conversion.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiahui Li,Yangfeng Wang,Mengru Hu,Zhangze Ye,Xiaohua Zheng,Peng Li,Chu Liang
The realization of heteroatom doping can enable carbon functional materials to have superior physiochemical properties via tailoring electron and ion distribution . However, the facile synthesis of heteroatom-doped carbon materials without CO 2 emission from precursor is a major challenge for low-carbon utilization of carbon materials. Herein, we report a facile self–templated method to synthesize boron–doped porous carbon derived from CO 2 based on the new reactions of 2LiBH 4 ·CO 2 with CO 2 . Boron–doped porous carbon is produced via a consecutive reaction between 2LiBH 4 ·CO 2 and CO 2 . The solid intermediate products with porous structure are formed at the first-step reaction. The newly developed porous solid products serve as the template for the chemical vapor deposition of gaseous intermediate products at the second-step reactions. The self-templated mechanism is demonstrated to form porous templates at initial stage for depositing carbon and boron sources on templates to produce boron-doped porous carbon. As a lithium storage material, it delivers a reversible capacity as high as ∼ 1660 mAh/g at 0.2 A/g and ∼ 890 mAh/g at 1.0 A/g after 1200 cycles. This finding opens a low-carbon and self-templated strategy to synthesize heteroatom–doped carbon functional materials from CO 2 .
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Lidan Wang,Youcai Lu,Shiyu Ma,Zheng Lian,Xiaolei Gu,Jie Li,Zhongjun Li,Qingchao Liu
Li-CO 2 batteries have attracted widespread attention due to their high energy density and environmental friendliness . However, problems such as the activation of CO 2 and the decomposition of discharge products (Li 2 CO 3 and C) are the key to restrict its development. Herein, an amine-based o-phenylenediamine (OPD) as a bifunctional liquid catalyst is introduced into Li-CO 2 battery , which realizes a great improvement of electrochemical performances by optimizing CO 2 reduction and evolution reaction process. Experiments coupled with theoretical calculations verify that the introduced OPD accelerates the migration of the discharge intermediates and makes the discharge products grow through the solution phase pathway, which greatly eliminates the passivation of the cathode as well as releases the battery capacity. Moreover, OPD, as a liquid redox mediator, can effectively promote the decomposition of discharge products, greatly reduce the charging potential and improve round-trip efficiency. Additionally, thanks to the increased activity of CO 2 reduction reaction (CDRR) and CO 2 evolution reaction (CDER) catalyzed by OPD, the cycling performance of Li-CO 2 battery has also been improved.
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