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Karimi, S., Mortazavi, Y., Khodadadi, A. A., Holmgren, A., Korelskiy, D. & Hedlund, J. (2020). Functionalization of silica membranes for CO2 separation. Separation and Purification Technology, 235, Article ID 116207.
Open this publication in new window or tab >>Functionalization of silica membranes for CO2 separation
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2020 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794, Vol. 235, article id 116207Article in journal (Refereed) Published
Abstract [en]

Five organic CO2-philic functional groups were incorporated in silica matrixes for preparation of functionalized silica membranes to explore the CO2 separation performance. Chemical groups including acetate, trifluoromethyl, methacrylate, urea and vinyl groups were anchored in the silica network using the co-condensation method.

The information from 29Si solid-state NMR and FTIR analyses indicates the successful formation of a covalent bond between functional groups and the silica network. The thickness of the functionalized silica layers was measured by SEM and the thermal stability of the organic groups was determined by thermogravimetric analysis (TGA).

The gas permeance and mixed gas selectivity of CO2/N2 was measured in the temperature range of 253–373 K with a feed pressure of 9 bar. A maximum selectivity of as high as 10 was observed for a trifluoromethyl functionalized silica membrane with a CO2 permeance of 5.5 × 10−7 mol s−1 m−2 Pa−1. Permporometry measurements indicated that the contribution of flow through micropores to the total flow for all the functionalized silica membranes varied between 62 and 82%. All membranes were CO2 selective.

 

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
CO2 separation, Functionalized silica membrane, Co-condensation
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-76487 (URN)10.1016/j.seppur.2019.116207 (DOI)000509611400063 ()2-s2.0-85073520358 (Scopus ID)
Note

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

Available from: 2019-10-23 Created: 2019-10-23 Last updated: 2020-03-06Bibliographically approved
Wei, J., Geng, S., Hedlund, J. & Oksman, K. (2020). Lightweight, flexible, and multifunctional anisotropic nanocellulose-based aerogels for CO2 adsorption. Cellulose (London), 27(5), 2695-2707
Open this publication in new window or tab >>Lightweight, flexible, and multifunctional anisotropic nanocellulose-based aerogels for CO2 adsorption
2020 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 27, no 5, p. 2695-2707Article in journal (Refereed) Published
Abstract [en]

CO2 adsorption is a promising strategy to reduce costs and energy use for CO2 separation. In this study, we developed CO2 adsorbents based on lightweight and flexible cellulose nanofiber aerogels with monolithic structures prepared via freeze-casting, and cellulose acetate or acetylated cellulose nanocrystals (a-CNCs) were introduced into the aerogels as functional materials using an impregnation method to provide CO2 affinity. The microstructure of the adsorbent was examined using scanning electron microscopy, and compression tests were performed to analyze the mechanical properties of the adsorbents. The CO2 adsorption behavior was studied by recording the adsorption isotherms and performing column breakthrough experiments. The samples showed excellent mechanical performance and had a CO2 adsorption capacity of up to 1.14 mmol/g at 101 kPa and 273 K. Compared to the adsorbent which contains cellulose acetate, the one impregnated with a-CNCs had better CO2 adsorption capacity and axial mechanical properties owing to the building of a nanoscale scaffold on the surface of the adsorbent. Although the CO2 adsorption capacity could be improved further, this paper reports a potential CO2 adsorbent that uses all cellulose-based materials, which is beneficial for the environment from both resource and function perspectives. Moreover, the interesting impregnation process provides a new method to attach functional materials to aerogels, which have potential for use in many other applications.

Place, publisher, year, edition, pages
Springer, 2020
Keywords
Cellulose aerogel, CO2 adsorption, Freeze-casting, Cellulose nanocrystals, Acetylation
National Category
Chemical Process Engineering Bio Materials
Research subject
Chemical Technology; Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-77515 (URN)10.1007/s10570-019-02935-7 (DOI)000519634600024 ()2-s2.0-85077562499 (Scopus ID)
Funder
Bio4Energy
Note

Validerad;2020;Nivå 2;2020-04-06 (alebob)

Available from: 2020-01-24 Created: 2020-01-24 Last updated: 2020-04-06Bibliographically approved
Geng, S., Wei, J., Jonasson, S., Hedlund, J. & Oksman, K. (2020). Multifunctional Carbon Aerogels with Hierarchical Anisotropic Structure Derived from Lignin and Cellulose Nanofibers for CO2 Capture and Energy Storage. ACS Applied Materials and Interfaces, 12(6), 7432-7441
Open this publication in new window or tab >>Multifunctional Carbon Aerogels with Hierarchical Anisotropic Structure Derived from Lignin and Cellulose Nanofibers for CO2 Capture and Energy Storage
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2020 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 12, no 6, p. 7432-7441Article in journal (Refereed) Published
Abstract [en]

In current times, CO2 capture and light-weight energy storage are receiving significant attention and will be vital functions in next-generation materials. Porous carbonaceous materials have great potential in these areas, whereas most of the developed carbon materials still have significant limitations, such as non-renewable resources, complex and costly processing or the absence of tailorable structure. In this study, a new strategy is developed for using the currently under-utilized lignin and cellulose nanofibers, which can be extracted from renewable resources to produce high-performance multifunctional carbon aerogels with a tailorable, anisotropic pore structure. Both the macro- and microstructure of the carbon aerogels can be simultaneously controlled by discreetly tuning the weight ratio of lignin to cellulose nanofibers in the carbon aerogel precursors, which considerably influences their final porosity and surface area. The designed carbon aerogels demonstrate excellent performance in both CO2 capture and capacitive energy storage, and the best results exhibit a CO2 adsorption capacity of 5.23 mmol g-1 at 273 K and 100 kPa, and a specific electrical double layer capacitance of 124 F g-1 at a current density of 0.2 A g-1, indicating that they have great future potential in the relevant applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020
Keywords
carbon aerogels, lignin, cellulose nanofibers, CO2 capture, supercapacitors
National Category
Bio Materials Chemical Process Engineering
Research subject
Chemical Technology; Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-77516 (URN)10.1021/acsami.9b19955 (DOI)000514256400065 ()2-s2.0-85079342224 (Scopus ID)
Funder
Bio4EnergySwedish Research CouncilSwedish Research Council Formas
Note

Validerad;2020;Nivå 2;2020-02-24 (alebob)

Available from: 2020-01-24 Created: 2020-01-24 Last updated: 2020-03-10Bibliographically approved
Zhou, M., Khokarale, S. G., Balsamo, M., Mikkola, J.-P. & Hedlund, J. (2020). Oligoamine ionic liquids supported on mesoporous microspheres for CO2 separation with good sorption kinetics and low cost. Journal of CO2 Utilization, 39, Article ID 101186.
Open this publication in new window or tab >>Oligoamine ionic liquids supported on mesoporous microspheres for CO2 separation with good sorption kinetics and low cost
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2020 (English)In: Journal of CO2 Utilization, ISSN 2212-9820, E-ISSN 2212-9839, Vol. 39, article id 101186Article in journal (Refereed) Published
Abstract [en]

Ionic liquids display good CO2 absorption capacity but poor absorption kinetics and high costs. In the present work, we show that these problems can be solved by impregnating the new low cost ionic liquid pentaethylenehexammonium chloride [PEHA][Cl] and the corresponding amine precursor on a low cost mesoporous microsphere support. Nitrogen adsorption/ desorption, high-resolution SEM and thermogravimetric analysis were employed to analyze the structural and thermal properties of the prepared sorbents. The CO2 adsorption and desorption performance was studied by column experiments and mathematical models were fitted to the data. The results showed that sorbents displayed excellent sorption kinetics and capacity, comparable to the best reports in the literature. In addition, the sorbents could be regenerated and displayed high thermal stability. Finally, the costs of the sorbents developed in the present work is much lower than previously reported sorbents. Therefore this novel supported IL system could be promising for industrial CO2 removal and recovery applications.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Amines, Carbon dioxide, Gas separation, Ionic liquids, Kinetics
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-78860 (URN)10.1016/j.jcou.2020.101186 (DOI)
Note

Validerad;2020;Nivå 2;2020-05-12 (johcin)

Available from: 2020-05-12 Created: 2020-05-12 Last updated: 2020-05-12Bibliographically approved
Grahn, M., Faisal, A., Öhrman, O. G. ., Zhou, M., Signorile, M., Crocellà, V., . . . Hedlund, J. (2020). Small ZSM-5 crystals with low defect density as an effective catalyst for conversion of methanol to hydrocarbons. Paper presented at 8th Czech-Italian-Spanish Symposium on Zeolites and Catalysis, JUN, 2019, Amantea, ITALY. Catalysis Today, 345, 136-146
Open this publication in new window or tab >>Small ZSM-5 crystals with low defect density as an effective catalyst for conversion of methanol to hydrocarbons
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2020 (English)In: Catalysis Today, ISSN 0920-5861, E-ISSN 1873-4308, Vol. 345, p. 136-146Article in journal (Refereed) Published
Abstract [en]

This work presents the synthesis of nearly defect-free ZSM-5 nanosized crystals, prepared in fluoride medium by seeding with silicalite-1. This material was carefully characterized and its catalytic performances in the methanol to hydrocarbons (MTH) reaction were assessed. Such fluoride-based material was compared to a reference ZSM-5, produced through a conventional alkaline synthesis but from the same seeding. Despite both the materials show closely identical morphology and they have a comparable acid site population, the catalyst prepared using the fluoride route showed significantly longer lifetime in MTH compared to the catalyst prepared using conventional synthesis at high pH. The slower deactivation for the samples prepared using the fluoride route was ascribed, thanks to a thorough in situ IR spectroscopy study, to its lower density of internal defects. According to the UV-Raman characterization of coke on the spent catalyst, the fluoride-based ZSM-5 catalyst produces less molecular coke species, most probably because of the absence of enlarged cavities/channels as due to the presence of internal defects. On the basis of these observations, the deactivation mechanism in the ZSM-5 synthesized by fluoride medium could be mostly related to the deposition of an external layer of bulk coke, whereas in the alkali-synthesized catalyst an additional effect from molecular coke accumulating within the porous network accelerates the deactivation process.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
ZSM-5, defects, hydrocarbons, deactivation, MTH, IR spectroscopy, OH groups
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-76102 (URN)10.1016/j.cattod.2019.09.023 (DOI)000522039100016 ()2-s2.0-85073006485 (Scopus ID)
Conference
8th Czech-Italian-Spanish Symposium on Zeolites and Catalysis, JUN, 2019, Amantea, ITALY
Note

Godkänd;2020;Nivå 0;2020-04-20 (alebob)

Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2020-04-28Bibliographically approved
Yu, L., Holmgren, A. & Hedlund, J. (2019). A novel method for fabrication of high-flux zeolite membranes on supports with arbitrary geometry. Journal of Materials Chemistry A, 7(17), 10325-10330
Open this publication in new window or tab >>A novel method for fabrication of high-flux zeolite membranes on supports with arbitrary geometry
2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 17, p. 10325-10330Article in journal (Refereed) Published
Abstract [en]

A novel procedure for the preparation of high-flux zeolite membranes was developed. This method relies on rendering the support hydrophobic, and thereby protected from the synthesis mixture and invasion of the support pores, while the cationic polymer on the surface still allowed deposition of zeolite seeds. Both high-flux MFI and CHA zeolite films were grown on both discs and tubular supports, which illustrates the applicability of the method to arbitrary membrane geometries. Typically, MFI disc membranes showed a very high CO2permeance of 85 × 10−7 mol m−2 s−1 Pa−1 and a CO2/H2 separation selectivity of 56 at 278 K and CHA disc membranes showed a very high CO2 permeance of 79 × 10−7 mol m−2 s−1 Pa−1 and a CO2/CH4 separation selectivity of 76 at 249 K. As the method is applicable to supports with complex geometries, it is suitable for preparation of membranes for industrial applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-73583 (URN)10.1039/C9TA00789J (DOI)000472183200016 ()2-s2.0-85064990509 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-24 (johcin)

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-07-10Bibliographically approved
Nobandegani, M., Yu, L., Mayne, B. & Hedlund, J. (2019). Adsorption and transport of CO2 and CH4 in CHA zeolite. In: : . Paper presented at 8th International Zeolite Membrane Meeting, IZMM2019.
Open this publication in new window or tab >>Adsorption and transport of CO2 and CH4 in CHA zeolite
2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Chemical Engineering Chemical Sciences
Identifiers
urn:nbn:se:ltu:diva-77178 (URN)
Conference
8th International Zeolite Membrane Meeting, IZMM2019
Available from: 2019-12-15 Created: 2019-12-15 Last updated: 2020-04-29
Nobandegani, M. S., Yu, L., Mayne, B. & Hedlund, J. (2019). Adsorption and transport of CO2 and CH4 in CHA zeolite. In: : . Paper presented at 8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige.
Open this publication in new window or tab >>Adsorption and transport of CO2 and CH4 in CHA zeolite
2019 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-76973 (URN)
Conference
8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige
Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2020-05-20Bibliographically approved
Hedlund, J., Yu, L. & Nobandegani, M. S. (2019). Diffusion of small molecules in ultra-thin MFI membranes. In: : . Paper presented at 8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige.
Open this publication in new window or tab >>Diffusion of small molecules in ultra-thin MFI membranes
2019 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-77098 (URN)
Conference
8th International Zeolite Membrane Meeting (IZMM2019), 16-20 juni, 2019, Luleå, Sverige
Available from: 2019-12-08 Created: 2019-12-08 Last updated: 2020-05-20Bibliographically approved
Yu, L., Nobandegani, M. & Hedlund, J. (2019). Highly permeable and selective CHA membranes for efficient CO2/CH4 separation. In: : . Paper presented at 8th International Zeolite Membrane Meeting(IZMM2019).
Open this publication in new window or tab >>Highly permeable and selective CHA membranes for efficient CO2/CH4 separation
2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ltu:diva-77448 (URN)
Conference
8th International Zeolite Membrane Meeting(IZMM2019)
Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-17
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1053-4623

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