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Chen, Yifeng
Publications (10 of 14) Show all publications
Chen, Y., Yu, H., Chen, J., Lu, X. & Ji, X. (2023). Viscous behavior of 1-hexyl-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/polyethylene glycol. Chinese Journal of Chemical Engineering, 54, 280-287
Open this publication in new window or tab >>Viscous behavior of 1-hexyl-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/polyethylene glycol
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2023 (English)In: Chinese Journal of Chemical Engineering, ISSN 1004-9541, E-ISSN 2210-321X, Vol. 54, p. 280-287Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2023
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-90051 (URN)10.1016/j.cjche.2022.03.015 (DOI)2-s2.0-85146450288 (Scopus ID)
Funder
The Kempe Foundations, SMK21-0020Swedish Energy Agency
Note

Validerad;2023;Nivå 2;2023-04-20 (hanlid);

Funder: National Natural Science Foundation of China (22108115, 21838004); Joint Research Fund for Overseas Chinese Scholars and Scholars, Hong Kong; Macao Young Scholars (21729601); China Postdoctoral Science Foundation (2021M691554)

Available from: 2022-04-01 Created: 2022-04-01 Last updated: 2023-04-20Bibliographically approved
Chen, Y., Song, S., Li, N., Wu, J., Lu, X. & Ji, X. (2022). Developing hybrid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/water absorbent for CO2 separation. Applied Energy, 326, Article ID 119972.
Open this publication in new window or tab >>Developing hybrid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/water absorbent for CO2 separation
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2022 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 326, article id 119972Article in journal (Refereed) Published
Abstract [en]

The development of novel absorbents is essential for improving CO2 separation technology. In this study, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/water ([Hmim][NTf2]/TiO2-H2O) was developed to separate CO2, where the thermodynamic and kinetic experiments were conducted, and Henry's constant and the liquid-side mass-transfer coefficient were determined accordingly. Furthermore, CO2 separation performance in a bubble tower was validated. A previously proposed index named “absorption ability” (AA) was used to predict and compare the experimental results. Additionally, the cost of biogas upgrading (i.e., CO2 removal for biogas purification) using [Hmim][NTf2]/TiO2-H2O was estimated. The results showed that for the developed [Hmim][NTf2]/TiO2-based technology, the average CO2 mass-transfer rate was increased by 20.0% compared with the current commercialized technology, and the contributions from the thermodynamic and kinetic aspects were 2.5% and 17.5%, respectively. The cost of biogas upgrading was 16.6% lower. In addition, AA successfully predicted the performance of CO2 separation technologies, achieving an average relative deviation of 8.1%.

Place, publisher, year, edition, pages
Elsevier Ltd, 2022
Keywords
Absorption ability, CO2 separation, Ionic liquid, Titanium dioxide
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-93770 (URN)10.1016/j.apenergy.2022.119972 (DOI)000862810100011 ()2-s2.0-85138505949 (Scopus ID)
Funder
The Kempe Foundations, (SMK21-0020)Swedish Energy Agency, (P50830-1)
Note

Validerad;2022;Nivå 2;2022-10-31 (joosat);

Funder: National Natural Science Foundation of China (22108115, 21838004, 21908093); China Postdoctoral Science Foundation (2021M691554); Joint Research Fund for Overseas Chinese Scholars and Scholars in Hong Kong and Macao Young Scholars (21729601); National Basic Research Program of China (973 Program) (2013CB733500)

Available from: 2022-10-31 Created: 2022-10-31 Last updated: 2022-10-31Bibliographically approved
Dai, Z., Chen, Y., Sun, Y., Zuo, Z., Lu, X. & Ji, X. (2022). Screening ionic liquids for developing advanced immobilization technology for CO2 separation. Frontiers in Chemistry, 10, Article ID 941352.
Open this publication in new window or tab >>Screening ionic liquids for developing advanced immobilization technology for CO2 separation
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2022 (English)In: Frontiers in Chemistry, E-ISSN 2296-2646, Vol. 10, article id 941352Article in journal (Refereed) Published
Abstract [en]

Developing immobilized-ionic liquids (ILs) sorbents is important for CO2 separation, and prior theoretically screening ILs is desirable considering the huge number of ILs. In this study, the compressibility of ILs was proposed as a new and additional index for screening ILs, and the developed predictive theoretical model, i.e., electrolyte perturbed-chain statistical associating fluid theory, was used to predict the properties for a wide variety of ILs in a wide temperature and pressure range to provide systematic data. In screening, firstly, the isothermal compressibilities of 272 ILs were predicted at pressures ranging from 1 to 6,000 bar and temperatures ranging from 298.15 to 323.15 K, and then 30 ILs were initially screened. Subsequently, the CO2 absorption capacities in these 30 ILs at temperatures from 298.15 to 323.15 K and pressures up to 50 bar were predicted, and 7 ILs were identified. In addition, the CO2 desorption enthalpies in these 7 ILs were estimated for further consideration. The performance of one of the screened ILs was verified with the data determined experimentally, evidencing that the screen is reasonable, and the consideration of IL-compressibility is essential when screening ILs for the immobilized-IL sorbents.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2022
Keywords
CO2 separation, ePC-SAFT, ionic liquids, immobilization, compressibility
National Category
Other Environmental Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-92368 (URN)10.3389/fchem.2022.941352 (DOI)000831815200001 ()35903192 (PubMedID)2-s2.0-85134994382 (Scopus ID)
Funder
The Kempe Foundations, SMK21-0020Swedish Energy Agency
Note

Validerad;2022;Nivå 2;2022-08-23 (hanlid);

Funder: National Natural ScienceFoundation of China (21838004, 22108115); Joint Research Fund for Overseas Chinese Scholars and Scholars in Hong Kong and Macao Young Scholars (21729601); Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX21_1180); China Postdoctoral Science Foundation funded project (2021M691554)

Available from: 2022-08-09 Created: 2022-08-09 Last updated: 2022-11-30Bibliographically approved
Chen, Y., Dai, Z., Ji, X. & Lu, X. (2021). CO2 absorption using a hybrid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/polyethylene glycol absorbent. Fluid Phase Equilibria, 538, Article ID 113011.
Open this publication in new window or tab >>CO2 absorption using a hybrid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/polyethylene glycol absorbent
2021 (English)In: Fluid Phase Equilibria, ISSN 0378-3812, E-ISSN 1879-0224, Vol. 538, article id 113011Article in journal (Refereed) Published
Abstract [en]

Developing novel hybrid ionic liquid/porous material/co-solvent absorbents with the confinement effect is essential for CO2 separation. In this study, CO2 solubilities in 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide/polyethylene glycol ([Hmim][Tf2N]/TiO2-PEG200) with different ratios of [Hmim][Tf2N]/TiO2 and various roughnesses of TiO2 (P25 and T500) were measured and described with the Henry's law. Furthermore, the contribution of the confinement effect on the CO2 solubility was quantified, and the relationship between the surface roughness and molecular parameters was established for predicting its contribution to the confinement effect. In addition, the hybrid absorbent was recycled by a multi-cycle experiment. The results show that the contribution of confinement effect on CO2 absorption capacity (on mass basis) and Gibbs free energy occupy around 24.5 % and 8.12 % in [Hmim][NTf2]/T500-PEG200 (w[Hmim][NTf2]/T500 = 2.88 wt%) at 308.2 K, respectively. The surface roughness can double the confinement effect. Based on the CO2 absorption capacity and enthalpy, [Hmim][NTf2]/T500-PEG200 (w[Hmim][NTf2]/T500 = 2.88 wt%) is a promising hybrid absorbent for CO2 separation.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Ionic liquid, Carbon dioxide, Titanium dioxide, Solubility, Confinement effect
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-83246 (URN)10.1016/j.fluid.2021.113011 (DOI)000640908900005 ()2-s2.0-85102624151 (Scopus ID)
Funder
The Kempe FoundationsSwedish Energy Agency, P50830-1
Note

Validerad;2021;Nivå 2;2021-04-07 (alebob);

Finansiär: Joint Research Fund for Overseas Chinese Scholars and Scholars in Hong Kong and Macao Young Scholars (21729601); National Natural Science Foundation of China (21838004)

Available from: 2021-03-12 Created: 2021-03-12 Last updated: 2021-05-28Bibliographically approved
Chen, Y., Yang, Z., Lu, X. & Ji, X. (2021). Mass-transfer kinetics of CO2 in a hybrid choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water absorbent. Journal of Molecular Liquids, 336, Article ID 116383.
Open this publication in new window or tab >>Mass-transfer kinetics of CO2 in a hybrid choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water absorbent
2021 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 336, article id 116383Article in journal (Refereed) Published
Abstract [en]

Understanding the mass-transfer kinetics of CO2 in novel hybrid absorbents with physical and chemical contributions is essential for process design and evaluation. In this study, the liquid-side mass-transfer coefficients (kL) and second-order reaction rate constants (k2) of CO2 in hybrid absorbents (namely, choline-2-pyrrolidine-carboxylic acid salt/polyethylene glycol/water ([Cho][Pro]/PEG200/H2O)) were determined. The kL values for the hybrid absorbents were obtained from the CO2 diffusion coefficients (DCO2) and the kL values in PEG200/H2O. The DCO2 value was calculated from the density and viscosity of the hybrid absorbents, whereas the kL values in PEG200/H2O were measured experimentally. The k2 values of CO2 in the hybrid absorbents were estimated according to the reaction mechanism, the enhancement factor, and the kL values, and compared with those of other commercialized absorbents. The results showed that 30 wt% [Cho][Pro]+70 wt% H2O had the highest kL and k2 values at atmospheric pressure, whereas the values of kL and k2 of CO2 in 30 wt% [Cho][Pro]/H2O+PEG200 were comparable to those in diethanolamine aqueous and amino-functionalized ILs. The hybrid absorbent of [Cho][Pro]/PEG200/H2O could be promising for CO2 separation considering its thermodynamic and kinetic properties.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Carbon dioxide, Ionic liquid, Kinetics, Reaction rate constant, Viscosity
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-84145 (URN)10.1016/j.molliq.2021.116383 (DOI)000664654300098 ()2-s2.0-85105786564 (Scopus ID)
Funder
The Kempe FoundationsSwedish Energy Agency, P40548-1
Note

Validerad;2021;Nivå 2;2021-05-24 (alebob);

Forskningsfinansiärer: Joint Research Fund for Overseas Chinese Scholars and Scholars in Hong Kong and Macao Young Scholars (21729601); National Natural Science Foundation of China (21776123, 21838004)

Available from: 2021-05-05 Created: 2021-05-05 Last updated: 2021-07-15Bibliographically approved
Chen, Y. (2020). CO2 separation using ionic liquid-based absorbents: thermodynamics and kinetics. (Doctoral dissertation). Luleå: Luleå University of Technology
Open this publication in new window or tab >>CO2 separation using ionic liquid-based absorbents: thermodynamics and kinetics
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ionic liquids (ILs) have shown great potential to be used as absorbents for CO2 separation owing to their unique properties such as immeasurably low vapour pressure, high thermal stability, high CO2 affinity, and tunable structure. A huge amount of researches have been carried out, and most of them focused on developing novel ILs for CO2 separation. However, high viscosity will impede the IL-based absorbents for the large-scale applications in CO2 separation.

The goal of this thesis was to develop IL-based hybrid green absorbents (i.e. choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/H2O ([Cho][Pro]/PEG200/H2O) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/titanium dioxide /PEG200 ([Hmim][Tf2N]/TiO2/PEG200)) for CO2 separation, in which H2O and/or PEG200 were used as co-solvents to adjust the viscosity. A systematic study was conducted from pure to multi-component systems convering experimental measurements and theoretical modeling of thermdynmaics and kinetics, and thus the effects of co-solvents on properties, phase equilibria, and kinetics were also analyzed.

To provide reliable and systematic properties and study the effect of H2O, the properties of PEG200 and PEG200/H2O were surveyed, evaluated, and correlated. The density and viscosity of [Cho][Pro]/PEG200/H2O were measured and correlated, and the excess mole volume and excess Gibbs energy of activation were estimated to understand the molecular structure and interactions between [Cho][Pro]/PEG200 and H2O. The results showed that H2O and PEG200 could decrease the viscosity of the hybrid absorbent significantly, and H2O interacted strongly with [Cho][Pro]/PEG200.

To obtain reliable and systematic gas solibilities and analyze the effect of H2O, the solubilities of pure CO2, CH4, and N2 in PEG200 were surveyed, measured, evaluated, and described with theoretical models. The CO2, CH4, and N2 solubilities in PEG200/H2O were measured and described with the Redlich-Kwong Nonrandom-Two-Liquid (RK-NRTL) model. The CO2 solubilities in [Cho][Pro]/PEG200 and [Cho][Pro]/H2O were also surveyed, measured, evaluated, and described using the RK-NRTL model. Furthermore, CO2 solubility in the hybrid absorbent was predicted with the model and compared with the new experimental results. The further investigation showed that the formation of carbomate dominated the entire CO2 absorption process by [Cho][Pro]/PEG200/H2O, and the presence of H2O resulted in the formation of bicarbonate.

To study the kinetics systematically combined with the effect of H2O, the liquid-side mass-transfer coefficients (kL) of [Cho][Pro]/PEG200/H2O were obtained from the CO2 diffusion coefficients () and the kL values in PEG200/H2O, in which was calculated from the density and viscosity of the hybrid absorbents, while the kL values in PEG200/H2O were measured experimentally. The reaction rate constant of CO2 in the hybrid absorbents was also estimated.

Based on the systematic studies from experimental measurement and modeling, it showed that 30 wt%[Cho][Pro]/H2O + PEG200 could be promising for CO2 separation with the consideration of both thermodynamic and kinetic properties. In addition, the hybrid absorbent also showed the good recyclability.

To use the confinement as the other strategy for further developing IL-based technology, the CO2 solubility in [Hmim][Tf2N]/TiO2/PEG200 with different ratios of [Hmim][Tf2N]/TiO2 was measured, and the Henry’s constant and absorption enthalpy of CO2 in the hybrid absorbent were calculated. The CO2 solubility in the hybrid absorbent was described with the Henry's law, the contribution of the confinement effect on the CO2 solubility was quantified, and the relationship between the roughness of TiO2 and molecular parameters was established. The results showed that the mass ratio of [Hmim][NTf2]/TiO2 in the hybrid absorbent should be lower than 5.72 %, where the contribution of confinement occupied around 20 % of the total CO2 absorption capacity in [Hmim][NTf2]/T500/PEG200. 2.88 wt%[Hmim][NTf2]/T500 + PEG200 could be promising for CO2 separation on aspects of CO2 capacity and absorption enthplay, and further study will be conducted on the properties and CO2 absorption kinetics.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2020
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
Ionic liquids, carbon dioxide, thermodynamics, kinetics
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-80791 (URN)978-91-7790-653-7 (ISBN)978-91-7790-654-4 (ISBN)
Public defence
2020-11-10, E130, Luleå, 13:00 (English)
Opponent
Supervisors
Available from: 2020-09-16 Created: 2020-09-15 Last updated: 2022-01-01Bibliographically approved
Chen, Y., Sun, Y., Yang, Z., Lu, X. & Ji, X. (2020). CO2 separation using a hybrid choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water absorbent. Applied Energy, 257, Article ID 113962.
Open this publication in new window or tab >>CO2 separation using a hybrid choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water absorbent
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2020 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 257, article id 113962Article in journal (Refereed) Published
Abstract [en]

Developing novel hybrid absorbents is essential for CO2 separation. In this study, the density and viscosity of a hybrid absorbent (choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water ([Cho][Pro]/PEG200/H2O)) were measured experimentally, and its CO2 solubility was also determined. The excess mole volume and excess Gibbs energy of activation of the hybrid absorbent were further estimated to understand the molecular structure and interactions between [Cho][Pro]/PEG200 and H2O. The CO2 solubilities in [Cho][Pro]/PEG200 and [Cho][Pro]/H2O were analyzed and described using the Redlich–Kwong non-random-two-liquid (RK-NRTL) model. Furthermore, the CO2 solubility in the hybrid absorbent was predicted using the RK-NRTL model and was compared with the new experimental results for verification. The effect of H2O on the CO2 absorption performance was further analyzed. The performance and cost of the hybrid absorbent were compared with those of other commercialized CO2 absorbents. In addition, the recyclability of the hybrid absorbent for CO2 separation was studied. The results of this study indicated that the hybrid absorbent could be promising for CO2 separation.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Ionic liquid, Carbon dioxide, Property, Solubility, Modeling
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-76484 (URN)10.1016/j.apenergy.2019.113962 (DOI)000506574700013 ()2-s2.0-85073480738 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-10-23 (johcin)

Available from: 2019-10-23 Created: 2019-10-23 Last updated: 2022-10-27Bibliographically approved
Lu, X., Chen, Y., Dong, Y., Ji, X., Xie, W., Wu, N., . . . Li, Z. (2020). Nano-interface enhanced CO2 absorption and mechanism analysis. Huagong Xuebao/CIESC Journal, 71(1), 34-42
Open this publication in new window or tab >>Nano-interface enhanced CO2 absorption and mechanism analysis
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2020 (English)In: Huagong Xuebao/CIESC Journal, ISSN 0438-1157, Vol. 71, no 1, p. 34-42Article in journal (Refereed) Published
Abstract [en]

CO2 capture and separation (CCS) is a key step to mitigate greenhouse gas emissions and develop renewable energy. The trade-off between the rate and efficiency in the CO2 separation process cannot be solved with the traditional process intensification. Using nano-interface to realize process intensification has been widely used in the chemical process with multi-phase transfer, and CO2 separation is one of examples. This review summarizes the research work from the establishment of CO2 transfer model at nano-interface and the resistance regulation, the acquisition of the CO2 chemical potentials at equilibrium and at the nano-interface (the driving force regulation) and the molecular simulation analysis of the interface enhancement mechanism. Based on the theoretical studies, the resistance distribution for the CO2 separation process in a real absorption tower is further analyzed and a "three-stage strengthening scheme" is proposed to decrease the investment and operating costs. © All Right Reserved.

Place, publisher, year, edition, pages
Materials China, 2020
Keywords
Chemical analysis, Economic and social effects, Gas emissions, Greenhouse gases, Investments, Operating costs, Separation, Chemical process, Interface enhancement, Mechanism analysis, Molecular simulations, Process intensification, Renewable energies, Resistance distribution, Theoretical study, Carbon dioxide
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-82058 (URN)10.11949/0438-1157.20191227 (DOI)2-s2.0-85097119268 (Scopus ID)
Note

Godkänd;2021;Nivå 0;2021-01-01 (johcin)

Available from: 2020-12-18 Created: 2020-12-18 Last updated: 2023-09-08Bibliographically approved
Chen, Y., Ma, C., Ji, X., Yang, Z. & Lu, X. (2020). Thermodynamic study on aqueous polyethylene glycol 200 solution and performance assessment for CO2 separation. Fluid Phase Equilibria, 504, Article ID 112336.
Open this publication in new window or tab >>Thermodynamic study on aqueous polyethylene glycol 200 solution and performance assessment for CO2 separation
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2020 (English)In: Fluid Phase Equilibria, ISSN 0378-3812, E-ISSN 1879-0224, Vol. 504, article id 112336Article in journal (Refereed) Published
Abstract [en]

To develop polyethylene glycol 200 (PEG200) and aqueous PEG200 solutions (PEG200/H2O) as solvents for CO2 separation, in this study, the available thermo-physical properties of PEG200 and PEG200/H2O measured experimentally were surveyed, evaluated, and correlated with empirical equations. The solubility of CO2 in PEG200 was also surveyed, evaluated and described with the Henry's law with the Poynting correction, while the solubilities of CH4 and N2 in PEG200 were determined experimentally and then described with the Henry's law. The CO2, CH4 and N2 solubilities in PEG200/H2O were measured and described with the Redlich–Kwong Nonrandom-Two-Liquid (RK-NRTL) model. In addition, the performances of PEG200, PEG200/H2O and other commercialized physical solvents for CO2 separation were discussed based on the properties, and the biogas upgrading was chosen as the example to quantitatively evaluate the performances of PEG200 and PEG200/H2O with process simulation and compared with the high pressure water scrubbing (HPWS). It shows that the total energy usage and the amount of recirculated solvent for biogas upgrading can decrease by 9.1% and 26.5%, respectively, when H2O is replaced by PEG200 completely.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
CO2, PEG200, Solubility, Modelling, Process simulation
National Category
Engineering and Technology Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-76327 (URN)10.1016/j.fluid.2019.112336 (DOI)000500036600007 ()2-s2.0-85072921202 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-10-21 (johcin)

Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2020-09-15Bibliographically approved
Ma, C., Wang, N., Chen, Y., Khokarale, S. G., Bui, T. Q., Weiland, F., . . . Ji, X. (2020). Towards negative carbon emissions: Carbon capture in bio-syngas from gasification by aqueous pentaethylenehexamine. Applied Energy, 279, Article ID 115877.
Open this publication in new window or tab >>Towards negative carbon emissions: Carbon capture in bio-syngas from gasification by aqueous pentaethylenehexamine
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2020 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 279, article id 115877Article in journal (Refereed) Published
Abstract [en]

In this work, an aqueous pentaethylenehexamine (PEHA) solution was studied for CO2 removal from bio-syngas for the first time. Firstly, pure CO2 absorption in aqueous PEHA solution under different conditions was conducted, and 20 wt% PEHA solution was identified as the best option. Secondly, the capture of CO2 was tested with synthetic syngas from a gas cylinder, and the species other than CO2 showed a negligible impact on CO2 removal. Finally, to evaluate the practical feasibility of using aqueous PEHA solution on the downstream CO2 capture, the pilot experiments of gasification with boreal forest-based biomasses were designed to provide real syngas with a realistic distribution in composition for further testing. The results showed that the operating conditions and the type of feedstocks affected the distribution in the bio-syngas composition. Among these feedstocks, at the optimal oxygen supply, using spruce needles generated the highest yields of CO and H2 and, meanwhile, gave rise to similar yields of other gases such as CO2, CH4, etc. The influence of the species other than CO2 for CO2 removal was negligible. Additionally, aqueous PEHA solution was tested as a biomass pretreatment agent, showing that no significant changes could be identified by the ultimate analysis (except for increased nitrogen content), but the yields of CO were affected negatively. On the other hand, when using the pretreated biomass by the aqueous PEHA solution, the NH3 concentration in bio-syngas reached to the highest (4000 parts per million), which slightly affected the CO2 absorption capacity and initial absorption rate of 20 wt% PEHA solution in a positive way.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Pentaethylenehexamine, CO2 removal, Biomass pre-treatment, Gasification, Bio-syngas, Negative carbon emission
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-80930 (URN)10.1016/j.apenergy.2020.115877 (DOI)000594115100006 ()2-s2.0-85091345059 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-09-25 (alebob)

Available from: 2020-09-25 Created: 2020-09-25 Last updated: 2023-09-05Bibliographically approved
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