ENERGY
·
2016
·
IF 4.292
Dong Fu,Pan Zhang,ChenLu Mi
The absorption of CO 2 in tetramethylammonium glycinate ([N 1111 ][Gly]) promotedMDEA (methyldiethanolamine) aqueous solution was investigated. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of MDEA and [N 1111 ][Gly] respectively ranged from 0.3 to 0.45 and 0.05 to 0.15. The influences of temperature and concentration on the absorption capacity of CO 2 were determined. The viscosities of CO 2 -unloaded and CO 2 -loaded MDEA-[N 1111 ][Gly] aqueous solutions were measured and correlated. The experiments showed that the absorption rate of CO 2 obviously increased when the MDEA aqueous solution was promoted by [N 1111 ][Gly]. The effects of temperature, concentration and solution viscosity on the absorption rate were illustrated.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Lei Mao,Yaxin Chen,Ruifang Zhang,Chun Yang,Yanhong Zhou,Guangya Zhang
The utilization of carbonic anhydrases (CAs) for CO2 capture aligns with the principles of environmental sustainability. However, there is an urgent need to minimize the cost of CA purification while improving their performance in harsh environments. A novel strategy was proposed to solve the above problems by employing the ferritin-tagged CA variant (DvCA8.0-F). The purification is achieved by low-speed centrifugation, yielding 92% activity recovery and 95% purity. After 14 weeks of incubation in a 50% MDEA solution at 50 °C, DvCA8.0-F maintained activity nearly equivalent to the initial activity, which showed remarkable stability compared to the free ones. Encouragingly, DvCA8.0-F had a yield of up to 800 mg/L, allowing for cost-effective CA-assisted CO2 absorption and desorption in MDEA solutions. The results show that DvCA8.0-F reduced the absorption time from 70 to 50 min at 40 °C and desorption time from 40 to 25 min at 96 °C in 25%MDEA+1%[N1111][Gly] solution with a final CO2 load and a stripped amount of CO2 at the same time. DvCA8.0-F exhibits the maximum reaction rate at 96 °C; the CO2 regeneration efficiency improved from 60% at 87 °C to 72%. When the concentration of DvCA8.0-F was 1.5 g/L, the absorption rate of CO2 reached about 90% of that of the 25% MEA solution. These results demonstrate the simplicity of preparation and the outstanding properties of DvCA8.0-F, which paves a feasible way for CA-assisted CO2 capture. This exciting strategy may also have excellent potential in enzymes for innovative chemical synthesis to achieve the sustainable development of green chemistry.
研究领域:
生物化学
·
环境科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Mine Du,Han Chen,Jiexu Ye,Shihan Zhang,Jianmeng Chen,Lidong Wang
Carbonic anhydrase (CA) enzyme-based absorption process is under development for CO 2 capture. How to maintain the activity and stability of CA enzyme is the important issue related to this emerging process. The immobilization technologies are regarding as the promising method to stabilize CA in harsh environments. This work encapsulated CA into zeolitic imidazolate framework-8 (ZIF-8) with different particle sizes according to several preparation protocols and investigated their activity and stability. The experimental results revealed that the preliminary crystallization time, enzyme dosing amount, and particle sizes of ZIF-8 had a significant influence on the catalytic performance of immobilized CA. The remaining activity of the CA after immobilization ranged from 52 to 93 % depending on the employed preparation protocol. In addition, the immobilized CA with particle size of ∼400 nm exhibited better activity compared to those with particle sizes of ∼100 nm and 1000 nm. Moreover, with the increase of the preliminary crystallization time, the stability of immobilized CA descended.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Capture Science & Technology
·
2024
·
IF 10.4
Pengfei Zhao,Ke Wang,Jie Hong,Edward J. Anthony
The reversible CO 2 absorption/desorption of lithium orthosilicate (Li 4 SiO 4 ) sorbents holds potential for high temperature capture of CO 2 from hot flue gases, sorption-enhanced reforming and solar thermochemical energy storage. In this study, we have prepared a series of Li 4 SiO 4 sorbents using a combination of K 2 CO 3 addition and dry ball-milling procedure to improve the relatively slow kinetics under low CO 2 partial pressure conditions. The synergistic effects of dry ball-milling and K 2 CO 3 addition on the intrinsic properties of Li 4 SiO 4 sorbents were explored by thermogravimetric analysis and structural characterizations. Thermogravimetric analysis indicate that the highest CO 2 uptakes were achieved with dry ball-milling combined with K 2 CO 3 physical addition. The structural characterizations further reveal that this sorbent (P-3K-1.5 M) had the smallest crystallite/particle size, largest surface area, and highest availability of surface alkaline-sites. The kinetics analysis also demonstrates that P-3K-1.5 M exhibited the fastest sorption kinetics during a double process. Additionally, P-3K-1.5 M maintained a high capacity over 10 sorption/desorption cycles. Therefore, this synthesis technique, which is simple, cost-effective, and easily scalable, shows great promise for high-temperature CO 2 capture.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Greenhouse Gas Control
·
2019
·
IF 3.231
Mimi Xu,Shujuan Wang,Lizhen Xu
21 pairs of physical-chemical biphasic solvents were screened out using a fast screening facility and the distribution of components was detected both in upper and lower phases after absorption. The physical solvents and amines were enriched in opposite phases due to the limited solubility of absorption products in the physical solvents, and the enrichment of components gets higher as the loading time goes by. Comparisons of the cyclic capacity showed that MEA and DETA were much better main solvents than BDA in biphasic solvents, and 2.5 DETA-4 sulfolane has the highest CO 2 cyclic capacity of 4.486 mol L −1 , which was much higher than that of 30 wt% MEA. The concentrations of physical solvents influence the cyclic capacity a lot rather than the types of physical solvents. Then the phase separation character and absorption performance were analyzed for solutions in different amine to physical solvent concentration ratios, and the results showed that increasing the concentration of the physical solvent within certain range benefits to raising cyclic absorption capacity and reducing the energy penalty. At last, the sensible heat and vaporization heat of two biphasic solvents were estimated with a flash module of Aspen Plus, which showed less energy penalty than that of 30 wt% MEA.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Peng Lu,Xianhui Yan,Lyumeng Ye,Dingsheng Chen,Dongyao Chen,Jianhang Huang,Chaoping Cen
The co-removal of CO 2 while removing SO 2 and NO x from industrial flue gas has great potential of carbon emission reduction but related research is lacking. In this study, a wet scrubbing process with various urea solutions for desulfurization and denitrification was explored for the possibility of CO 2 absorption. The results showed that the urea-additive solutions were efficient for NO x and SO 2 abatement, but delivered < 10% CO 2 absorption efficiency. The addition of Ca(OH) 2 dramatically enhanced the CO 2 absorption, remained the desulfurization efficiency, unfortunately restricted the denitrification efficiency. Among various operating parameters, pH of solution played a determining role during the absorption. The contradictory pH demands of CO 2 absorption and denitrification were observed and discussed in detail. A higher pH of solution than 10 was favorable for CO 2 absorption, while the oxidizing of NO to NO 2 , NO 2 − or NO 3 − by NaClO 2 was inhibited in this condition. When 7 < pH < 10, it was favorable for the conversion and absorption of NO and NO x . However, the conversion of HCO 3 − to CO 3 2− was significantly inhibited, hence preventing the absorption of CO 2 . Large part of Ca(OH) 2 became CaCO 3 with a finer particle size, which covered the unreacted Ca(OH) 2 surface after the reaction. Kinetic analysis showed that the CO 2 absorption in urea-NaClO 2 -Ca(OH) 2 absorbent was controlled by chemical reaction in early stage, then by ash layer diffusion in later stage.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Greenhouse Gases-Science and Technology
·
2022
·Vol. 12
·期 6
·738-750
·
IF 2.518
Jian Liu,Chengdong Kong,Liu Yang,Xiaojiang Wu,Zhongxiao Zhang
In this study, the mass transfer enhancement by nanoparticles during CO 2 absorption process with MDEA solution in a randomly packed tower was investigated. The mass transfer performance of MDEA solution with and without nanoparticles were quantified and analyzed in terms of the volumetric overall mass transfer coefficient ( K G a v ). An enhancement factor ( E ), defined as the ratio of K G a v with and without nanoparticles, was further introduced to evaluate the enhancement effect of the addition of nanoparticles. The effects of TiO 2 nanoparticle concentration, MDEA concentration, liquid flow rate, liquid temperature, inert gas flow rate, and CO 2 loading on K G a v and E were systematically studied in the packed tower. It is found that the maximum value of E can reach 1.37, when the nanoparticle concentration is 0.09 wt %, the liquid flow rate is 21.22 m 3 /m 2 ·h, the liquid temperature is 27°C, the MDEA concentration is 30%, the gas flow rate is 7.58 kmol/m 2 ·h and the CO 2 loading is 0.2 mol CO 2 /mol MDEA. Usually, the K G a v of the MDEA nanofluids can be increased by 10–37% in a randomly packed tower compared to that of the MDEA solution, which is consistent with the results from the bubbling reactors. However, when the CO 2 loading of absorption exceeds 50%, E becomes less than 1.0, which means that high CO 2 loading inhibits the enhancement effect of nanoparticles. In order to predict the mass transfer performance of MDEA nanofluid, a formula correlating E and various dimensionless operating parameters (i.e. L ̂ $\hat{L}$ , T ̂ $\hat{T}$ , C ̂ nf ${\hat{C}}_{{\rm{nf}}}$ and C ̂ MDEA ${\hat{C}}_{{\rm{MDEA}}}$ ) is proposed and fitted with an average absolute deviation of 14%. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yitai Wang,Yinge Bai,Fukang Song,Shaojuan Zeng,Lulu Wang,Xiangping Zhang
Ionic liquids (ILs)-based solvent absorption is a promising green and low regenerative energy consumption technology for CO2 capture. Various functionalized ILs with highly efficient performance have been developed in academia, and the research focuses on thermodynamic properties such as CO2 solubility, gas–liquid equilibrium, and reaction heat. Kinetic studies of CO2 in ILs are also important to evaluate their potential for industrial applications, which need to be studied further. In this work, the mass transfer characteristics of three azole-based IL anhydrous solvents were studied in a wetted-wall column (WWC). At 313.15 K, the total mass transfer coefficient (KG) of fresh [HDBU][Im]/EG, [Cho][Im]/EG, and [Cho][Triz]/EG was 5.40, 2.32, and 0.80 mmol/(m2·s·kPa), respectively. The KG of the three solvents increased along with increase in the temperature. Conversely, when the CO2 loading in the solvent increased, KG decreased. At the initial stage of absorption, the mass transfer resistance of [HDBU][Im]/EG was mainly in the gas phase and then gradually changed to liquid phase. However, due to the excessive viscosity of [Cho][Im]/EG and [Cho][Triz]/EG, the mass transfer resistance was mainly concentrated in the liquid phase. The enhancement factor (E) of [HDBU][Im]/EG was higher than 159, indicating that it had good chemical reaction ability, thereby improving the mass transfer ability. The KG of [HDBU][Im]/EG is 92.12, 307.01, and 117.48% higher than MEA/H2O, MDEA/PZ/H2O, and MEA/AEEA/H2O at 313.15 K, respectively. This work showed that [HDBU][Im]/EG had a good mass transfer performance and great potential in future industrial applications. At the same time, the mass transfer law was summarized to provide theoretical support for CO2 capture technology and reactor design.
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
ENERGY & FUELS
·
2025
·
IF 5.3
Runfen Zheng,Lixin Wei,Yuxin Bai,Jianfei Man,Jian Ye,Huiping Zhang,Yihan Wang
To address the issues of poor regeneration performance and high regeneration energy consumption associated with traditional CO2 absorbents, the development of novel phase-change absorbents has become a key area of research. In this study, a new phase-change absorbent system, DEGDEE-AEEA-AMP, is developed, using N-(2-hydroxyethyl)ethylenediamine (AEEA) as the main absorbent, bis(2-ethoxyethyl)ether (DEGDEE) as the phase-separation agent, 2-amino-2-methyl-1-propanol (AMP) as the activator, and water as the solvent. The performance of this system is compared with that of monoethanolamine (MEA) at a 30% mass concentration, which serves as the reference standard. The study includes absorption, desorption, corrosion, cyclic absorption–desorption experiments, and regeneration energy consumption estimations. The results indicate that the volume of the rich phase in the DEGDEE-AEEA-AMP (DAP) system constitutes 56.7% of the total volume. When the AMP mass fraction is 15%, the absorption capacity reaches 2.52 mol·kg–1, which is 14.0% higher than that of MEA. The maximum desorption rate is 13.19 × 10–3 mol·kg–1·s–1, which is 3.39 times higher than that of MEA. The minimum regeneration energy consumption is 2.742 GJ·t–1 CO2, representing a 29.9% reduction compared to 30% MEA. The corrosion rate of the rich liquid is 0.230 mm/a, 1.32 times that of MEA, but it can be significantly reduced by adding anhydrous Na2SO3. When the AMP mass fraction is 15%, the DAP phase-change absorbent system exhibits high absorption and desorption performance, good cyclic stability, and lower regeneration energy consumption.
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
International Journal of Greenhouse Gas Control
·
2017
·
IF 3.741
Lidong Wang,Shanlong An,Songhua Yu,Shihan Zhang,Yifeng Zhang,Meng Li,Qiangwei Li
CO 2 from coal-fired flue gas is one of the main components of greenhouse gases. Using phase change absorbents as a solvent can effectively decrease the consumption of regeneration energy for CO 2 capture process. This study employed a mixed solution of diethylenetriamine (DETA) and diethylaminoethanol (DEEA) as the new phase change absorbent for CO 2 absorption. The impact of the phase change behavior on the mass transfer characteristics of CO 2 absorption was investigated in a wetted-wall column. Effects of the temperatures, CO 2 loadings, and gas flow rate on the mass transfer coefficient were also conducted. The results indicated that temperature and CO 2 loading had relatively remarkable effects on the total mass transfer coefficient; whereas the gas flow rate had a smaller effect. Kinetic analysis revealed that the mass transfer resistance of CO 2 absorption into the DETA/DEEA phase change absorbent mainly concentrated at the liquid film side. The findings provide a theoretical reference for the development of new CO 2 phase change absorption technology .
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
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 13
·7300-7313
·
IF 14.511
Zhao Sun,Junpeng Liu,Rongjun Zhang,Yu Wu,Hongwei Li,Sam Toan,Zhiqiang Sun
Sorption-enhanced steam reforming of methanol (SE-SRM) is a promising approach to creating a high-purity hydrogen supply. However, catalysts suffer from activity deactivation and low CO2 uptake capacity. In this study, we investigate the role of Ga doping of Cu–MgO in SE-SRM by synthesizing a series of MgO embedded xGaCuMg catalytic sorbents via a sol–gel method. The TEM-EDX mapping results indicate that MgO nanoparticles can be successfully embedded in the bulk-phase of the catalytic sorbent with a stabilized microstructure. The results from in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reveal that the Ga-doped catalytic sorbent is conducive to promoting the conversion of C-containing intermediates in SE-SRM, and absorbing CO2 in the form of bidentate carbonate rather than monodentate carbonate. Experimental studies verify that the best uptake capacity of 18GaCuMg catalytic sorbent (36.25 mg CO2/g MgO) achieves almost complete conversion of methanol (99.70%) with 100% H2 selectivity at 200 °C. Specifically, no CO is formed during the kinetic-control stage of SE-SRM. Density functional theory (DFT) calculations based on the Cu(111)Ga2O3(202)MgO(200) model revealed that the Ga doping can enhance the adsorption energies of methanol and carbon dioxide, promoting methanol activation and increasing CO2 uptake capacity. These findings provide valid strategies for functionalized nanomaterial design, which will substantially promote the SE-SRMR performance with desired catalytic sorbent recyclability.
研究领域:
材料科学
·
催化化学
·
能源工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Liuxing She,Lei Peng,Hang Yuan,Tianrong Zhu,Qiang Fu,Zaikun Wu
The absorption kinetics of CO2 into a novel nonaqueous mixture of 2-amino-2-methyl-1-propanol (AMP) and piperazine (PZ) was studied at atmospheric pressure. The effects of AMP/PZ molar ratio, total concentration, absorption temperature, and inlet flow rate were discussed. The results showed that the composite absorbent with an AMP/PZ ratio of 6:4 had a good effect on the CO2 absorption at 293 K. Unlike relevant reports at home and abroad, the solubility of CO2 in the 1-pentanol solution of AMP and PZ (AMP-PZ-Pentanol) was calculated based on a solution rule model and relevant data from Aspen Plus. The absorption kinetics of CO2 into nonaqueous composite absorbent was analyzed by a double stirred-cell absorber. It shows the enhancement factor increases with the increasing of total concentration but decreases with the increasing of absorption temperature. The absorption mechanism of CO2 in AMP-PZ-Pentanol was determined to be the formation of carbamate by FT-IR, 13C NMR, and XRD analysis. Based on the vapor–liquid equilibrium theory, the reaction heat of CO2 into the phase change absorbent was calculated to be 9.30 KJ mol–1. The results show that the composite absorbent has a lower reaction heat than any single component in it. The desorption experiment of saturated solution shows that the composite absorbent can be completely regenerated in a short period of time, which meets the industrial requirements for CO2 absorbents and will provide a theoretical basis for further industrial applications of this type of absorbent.
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
危险品化学品经营许可证（带存储）