Greenhouse Gases-Science and Technology
·
2025
·
IF 2.8
Xiaoming Xu,Ying Xie,Yang Xia,Mengxiang Fang,Jie Cheng,Chenxiang Yao,Zihao Liu,Hao Xiang,Nengchuang Zhu,Gengsheng Liu
With the increasing global energy demand and its environmental impacts, carbon capture, utilization, and storage technology (CCUS) has become a crucial means to reduce CO 2 emissions and address climate change. This study investigated the thermal and oxidative degradation characteristics of two amine blend absorbents, methyldiethanolamine (MDEA)/piperazine (PZ) and MDEA/2-(piperazin-1-yl) ethanamine (AEP) and explored the effect of sulfur compounds on their stability. The experimental results indicated that MDEA/PZ exhibited a lower thermal degradation rate, whereas MDEA/AEP, due to the thermal instability of the AEP component, showed poorer degradation performance. In terms of oxidative degradation, monoethanolamine (MEA) demonstrated a higher oxidative degradation rate, whereas MDEA/PZ and MDEA/AEP exhibited lower oxidative degradation rates. The addition of inhibitors reduced the oxidative degradation rates of MDEA/PZ and MDEA/AEP, with antimony potassium tartrate (APT) proving to be the most effective inhibitor. In sulfur-containing environments, sulfur compounds (hydrogen sulfide and carbonyl sulfide) significantly enhanced both the thermal and oxidative degradation rate of MDEA/PZ and MDEA/AEP, particularly for MDEA/AEP, where the thermal degradation rate increased by 25.2%. This study revealed the impact of sulfur compounds on the thermal and oxidative degradation of absorbents. The findings provide important experimental data and theoretical support for optimizing the stability of carbon capture absorbents.
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ACTA MATERIALIA
·
2026
·
IF 10.7
Qinghu Guo,Ting Wang,Xiangyu Meng,Dongxu Li,Xiaoyi Gao,Zhonghua Yao,Weiping Gong,Huajun Sun,Hanxing Liu,Hua Hao,Shujun Zhang
Piezoelectric actuators are essential components in precision positioning and force generation systems, often operating under complex multiphysics conditions. In this work, soft-type 2.5%Eu-doped 0.52PMN-0.33PT-0.15PZ piezoelectric ceramics with high piezoelectric charge coefficient d 33 = 1030 pC/N and piezoelectric strain coefficient d 33 * = 1120 pm/V were prepared, the electromechanical properties were systematically investigated under varying electric fields, uniaxial mechanical prestresses and temperatures. The results reveal that the strain exhibits a variation of ≈ 50% over the applied mechanical prestress range of 0 - 50 MPa, while showing a variation of < 20% across the tested temperature range 30 - 120°C. This demonstrates that within the tested ranges, mechanical stress is the dominant external factor governing the electromechanical response. With increasing prestress, the strain initially increases—reaching a maximum of 0.150% at 20 MPa—due to stress-assisted non-180° domain switching, and then decreases under higher stress due to domain wall clamping. This behavior reflects a transition from an electric field-controlled regime (< 20 MPa) to a stress-controlled regime (> 20 MPa), where domain wall mobility is suppressed and temperature-dependent phase transition effect is mitigated. Notably, the ceramic achieved a high mechanical work density of 0.040 J/cm 3 with electromechanical conversion efficiency of 46.4% at 40 MPa, while maintaining excellent temperature stability across all prestress conditions. These findings highlight the critical role of domain switching dynamics and stress-temperature coupling in determining actuator behavior, providing valuable design insights for the development of high-performance piezoelectric actuators with improved durability, reliability, and energy efficiency under extreme operational conditions.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2026
·
IF 2.2
Jianjun Chen,Jian Ma,Jichao Hu,Pan Zhang,Dong Fu,Lemeng Wang
In this study, we investigated the viscosity data of carbonated aqueous blends of 1-dimethylamino-2-propanol (DMA2P) and piperazine (PZ) over a temperature range of 303.2 to 323.2 K at atmospheric pressure. The concentration of DMA2P and PZ ranged from 30 wt% to 50 wt% and 2.5 wt% to 7.5 wt%, respectively. The experimental viscosities were calculated and predicted using the Weiland equation. The calculations showed good agreement with the experimental results, yielding an average relative deviation of 2.18%. Furthermore, the viscosity activation energy ( E a) and the estimated diffusion coefficient of CO 2 ( D CO2 ) into the carbonated DMA2P-PZ aqueous blends were derived using the Arrhenius-type expression and the modified Stokes-Einstein equation, respectively. The results indicate that the DMA2P-PZ absorbent exhibits promising potential for industrial application in CO 2 capture processes.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Anteng Dai,Xu Chen,Hengyu Li,Zhangfeng Dong,Xiaoyun Chen,Qinghai Long,Bihong Lv,Zuoming Zhou,Guohua Jing
Solid-liquid biphasic solvents(SLBS) are considering as promising absorption for CO 2 chemical capture because of their potential energy-saving potential and easily separation of solid products. Nevertheless most of the SLB systems still with some defects, such as premature phase transition and viscous solid products. This work proposed a novel non-aqueous biphasic absorbent with controllable solid–liquid phase transition, composed of piperazine (PZ), 2-amino-2-methyl-1-propanol (AMP), and N-methylformamide (NMF). When NMF is 90 % by volume as solvent and the volume ratio of PZ and AMP is 3:1, the absorbent maintained a homogeneous phase with CO 2 loading below 0.729 mol/mol, which was about 60.6 % of the saturated loading (1.202 mol/mol). As the loading further increased, the solid products generated and the solution separated into solid–liquid two phases. And the solid product into the saturated solution was only 14 % of the total volume while contained about 93.29 % of total loading. The phase-transition mechanism was investigated by using 13 C NMR analysis and molecular simulations. Due to the higher reactivity of PZ with CO 2 compared to AMP, CO 2 initially reacted with PZ to form PZCOO − and PZH + . The enhanced polarity of the final products, PZ(COO − ) 2 and PZ(H + ) 2 , together with a marked increase in ESP difference, promotes the formation of small-volume, CO 2 -rich solids in the later stages of absorption. During this process, intermediate products (PZCOO − and PZH + ) interact with AMPCOO − and AMPH + , allowing early-stage dissolution of products in the solvent and ultimately producing easily separable solids with high CO 2 enrichment. The regeneration heat duty of the novel SLBS was estimated about 0.76 GJ/ton CO 2 , representing just 20.0 % of the industry standard for MEA (3.80 GJ/ton CO 2 ), which indicated extremely energy-saving advantage of the novel solvent.
研究领域:
化学工程
·
环境科学
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ENERGY & FUELS
·
2026
·
IF 6
Fangqun Liang,Jingfeng Shen,Dunqiu Wang,Shengpeng Mo,Yanan Zhang,Yinming Fan,Jianwen Wei,Zongqiang Zhu,Xiaobin Zhou
Solid–liquid phase-change absorbents exhibit remarkable potential for CO2 capture owing to their significant energy-saving merits. Nevertheless, their industrial implementation is constrained by limited CO2 loading capacity and the high viscosity of solid products, which complicates solid–liquid separation. To address these issues, an efficient phase-change absorbent was developed using piperazine (PZ) as the active component and N,N-dimethylethanolamine (DMEA) as a dual-functional additive serving simultaneously as an auxiliary proton acceptor and a phase splitter. The proposed absorbent demonstrated high CO2 loading and formed readily separable crystalline solid products. The optimized 15 wt % PZ-DMEA absorbent achieved a CO2 loading of 1.24 mol CO2·mol–1 PZ, exceeding the theoretical limit predicted by the zwitterion mechanism. Notably, 99% of the absorbed CO2 was enriched in the solid phase, which accounted for only 56.7% of the total solution volume. Compared to the benchmark MEA absorbent, the developed system reduced regeneration energy consumption by 64%, mainly due to the substantial reduction in sensible and latent heat requirements. Additionally, the PZ-DMEA system displayed excellent cyclic stability, maintaining a CO2 loading of 0.72 mol·mol–1 after five absorption–desorption cycles. Characterization analyses and quantum chemical calculations were performed to elucidate the enhanced absorption and phase transition mechanisms. PZ initially reacted with CO2 to form a zwitterionic intermediate, which was subsequently deprotonated by free PZ and DMEA molecules to yield carbamates. The participation of DMEA in the deprotonation process enabled more PZ to engage in CO2 absorption, thereby boosting the overall PZ’s CO2 loading. The highly polar carbamate products formed strong intermolecular interactions with protonated amines, producing polar ion pairs that precipitated from the low-polarity DMEA-rich phase, ultimately driving the spontaneous solid–liquid phase transition.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Minghui Wu,Yumeng Wang,Guanjun Chen,Bo Jin,Zhiwu Liang,Hongxia Gao
Abstract Studying different absorbents and process configurations is crucial for the process performance of postcombustion CO2 capture, which can reduce the regeneration energy consumption of the stripper and improve the economics of the process. In this study, postcombustion CO2 capture processes using 30 wt % MEA and 20 wt % PZ+20 wt % MDEA as absorbents were established and investigated. Then, 30 wt % MEA and a mixed solution of 20 wt % PZ + 20 wt % MDEA were used as absorbents. Three process configurations were simulated, including the standard configuration, the AIC-SSF configuration combining interstage cooling (AIC) and split rich solvent flow (SSF), and the AIC-SSF-MVR configuration integrated with mechanical vapor recompression (MVR). The results indicate that, under standard operating conditions, the 20 wt % PZ + 20 wt % MDEA mixed amine exhibits a reboiler heat duty of 2.73 GJ/t CO2, which is 24.6% lower than that of the standard MEA baseline condition (3.62 GJ/t CO2). When adopting the AIC-SSF-MVR process configuration, the minimum regeneration energy consumption is further lowered to 2.14 GJ/t CO2, which is 40.9% less than that of the standard MEA operating condition. Economic analysis via APEA shows that the AIC-SSF-MVR process configuration using a 40 wt % PZ-MDEA solution delivers the lowest CO2 capture cost of 53.83 \$/t CO2. This value is approximately 27.9% lower relative to the standard MEA operating conditions (74.69 \$/t CO2).
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CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Gang Li,Ruiyang Tan,Xiangcheng Lu,Xinyu Zhang,Chengcheng Zhang,Bohong Gao,Yuting Zhou,Ke Chen,Ping Chen,Xinyi Wang
Chemical composition and morphological optimization are both effective strategies for constructing excellent electromagnetic wave absorption (EMWA) materials. While efficient EMWA materials derived from both metal-organic frameworks (MOFs) and MXenes have been extensively studied, composites derived from the Hofmann framework with MXene have not been reported. In this study, we employed a Hofmann framework ([Fe(pz)Ni(CN) 4 ], pz = pyrazine) and MXene (Ti 3 C 2 T x ) to create new MXene@Hofmann (MH1 and MH2) composites, using a simple co-precipitation method with two different contents of [Fe(pz)Ni(CN) 4 ]. The FeNi/C/TiO 2 composites with a multi-layered structure inherited from MXene were prepared by annealing the MXene@Hofmann composites at 500, 600, and 700 °C, resulting in the formation of MH1-500/600/700 and MH2-500/600/700 composites. Their compositions, morphologies, electromagnetic parameters, and EMWA performances were characterized. For the composites with a high [Fe(pz)Ni(CN) 4 ] content, MH2-600 has a minimum reflection loss ( RL min ) value of −30.63 dB at a thickness of only 1.8 mm and the broadest effective absorption bandwidth (EAB) of 3.90 GHz at 2.0 mm, while MH2-700 exhibits superior EMWA performance with an RL min value of −34.34 dB at 1.9 mm and an EAB value of 4.96 GHz at 2.1 mm. Their impressive EMWA performance might be attributed to the synergistic dielectric loss and magnetic loss and also the impedance matching from the reasonable ratio of the magnetic and dielectric components. This work demonstrates an effective strategy for constructing EMWA materials from the Hofmann framework and MXene.
研究领域:
材料科学
·
电磁材料
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复合材料
·
纳米材料
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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
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环境科学
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能源技术
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 9
·1-6
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IF 1.784
Zhao Tian,Dong Ming,Zhao Yi
[Fe(HB(pz) 3 ) 2 ], a well-studied spin-crossover (SCO) complex, has been entrapped in NH 2 -MIL-101(Al) metal–organic framework (MOF) via gas diffusion method. [Fe(HB(pz) 3 ) 2 ] would sublimate when temperature exceeds 100 °C, especially at low pressure. Thus, in the selected condition, [Fe(HB(pz) 3 ) 2 ] molecules can be sublimated to a gas phase and diffused into the pores of NH 2 -MIL-101(Al), which yield [Fe(HB(pz) 3 ) 2 ]@MIL-101 hybrid materials. The identity of composites, with a loading of iron complex at ~ 8 wt%, was characterized by X-ray diffraction and spectroscopic attestation. The hybrid materials demonstrate a gentle spin transition curve from 300 to 400 K, which is different from the SCO behavior of [Fe(HB(pz) 3 ) 2 ]. And for the pure [Fe(HB(pz) 3 ) 2 ] sample at 400 K, only 60% of Fe(II) is in HS, while in hybrid samples, HS state is complete. This interesting phenomenon might indicate that the spin transition in the hybrid sample can be triggered at lower temperature. The composite samples were thoroughly studied by X-ray diffraction, IR spectroscopy, atom absorption spectroscopy, nitrogen physisorption, and magnetic measurements. Thereby, a novel MOF-based material with isolated SCO units is proposed, which demonstrate a salient ‘matrix-effect’ on spin-crossover behavior of [Fe(HB(pz) 3 ) 2 ].
研究领域:
材料科学
·
化学
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高影响因子
International Journal of Greenhouse Gas Control
·
2019
·
IF 3.231
Fan Cao,Hongxia Gao,Qian Xiong,Zhiwu Liang
CO 2 absorption performance for various blended N ,N- dimethylethanolamine (DMEA) solutions in the presence of absorption promoters including Monoethanolamine (MEA), Piperazine (PZ), 2-(Ethylamino)ethanol (EAE), 2-(Methylamino)ethanol (MAE) and 2-Amino-2-methyl-1-propanol (AMP) was investigated in terms of CO 2 absorption flux by using a polytetrafluoroethylene (PTFE) hollow fiber membrane contactor. The experimental results show that the CO 2 absorption flux increases with a reasonable increase in liquid velocity, liquid temperature and total amine concentration. Also, the CO 2 absorption flux can increase by increasing gas velocity, CO 2 partial pressure but decrease with the increased lean CO 2 loading. In addition, it can be found that all of the investigated activated amines can improve the CO 2 absorption flux of aqueous DMEA solution. For fresh amine solution, the order of CO 2 absorption flux for the investigated amine blends can be ranked as: DMEA < DMEA + AMP < DMEA + MEA < DMEA + EAE < DMEA + MAE < DMEA + PZ. By contrast, for the amine solution with CO 2 loading of over 0.3 mol/mol, the order has also changed accordingly and can be ranked as: DMEA < DMEA + AMP < DMEA + EAE < DMEA + MAE < DMEA + MEA < DMEA + PZ. The DMEA + PZ mixture presents a significant improvement up to 52.44% in CO 2 absorption flux compared to that of single DMEA solution, and can be considered as a promising alternative for CO 2 capture.
研究领域:
化学工程
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环境科学
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膜技术
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