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Du, C., Zhang, X., Wang, X., Huang, W. & Zhou, M. (2024). Preparation of PDA@PEBA2533 membranes for C3H6/N2 separation. Huagong Jinzhan/Chemical Industry and Engineering Progress, 43(1), 437-446
Open this publication in new window or tab >>Preparation of PDA@PEBA2533 membranes for C3H6/N2 separation
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2024 (English)In: Huagong Jinzhan/Chemical Industry and Engineering Progress, ISSN 1000-6613, Vol. 43, no 1, p. 437-446Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Chemical Industry Press Co., Ltd., 2024
National Category
Chemical Engineering
Identifiers
urn:nbn:se:ltu:diva-104325 (URN)10.16085/j.issn.1000-6613.2023-0250 (DOI)2-s2.0-85184517573 (Scopus ID)
Available from: 2024-02-21 Created: 2024-02-21 Last updated: 2024-02-21
Zhou, M., Bodenmuller, N. & Hedlund, J. (2023). Enhanced bio-oil upgrading by sub-microscale dispersed silanol-free ZSM-5 nanosheets and evidence for revealing an unconventional mechanism. Chemical Engineering Journal, 478, Article ID 147457.
Open this publication in new window or tab >>Enhanced bio-oil upgrading by sub-microscale dispersed silanol-free ZSM-5 nanosheets and evidence for revealing an unconventional mechanism
2023 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 478, article id 147457Article in journal (Refereed) Published
Abstract [en]

Silanol-free ZSM-5 nanosheet with merely 35 nm thickness in the b-axis was synthesized by seeded growth from defect-free 10 nm silicalite-1 in a fluoride medium (denoted as F35). Submicron-scaled stöber sol silica beads were introduced into the gap between nanosheets to serve as a spacer for the prevention of neighboring crystals' close contact with each other, which can improve the heat and mass transportation during the catalytic reactions when compared to the aggregated zeolite crystals. Methanol-to-hydrocarbons (MTH) and model bio-oil upgrading were conducted by using dispersed F35, respectively, and the results were compared to the aggregated ZSM-5. The effluent from bio-oil upgrading through dispersed F35 contains no heavier compound, which was considered as the coke precursor, and significantly reduced amount of unreacted feeding molecule. GC–MS revealed that the coke solution from dispersed F35 contains a considerably reduced (61 %) amount of heavier carbon species. Among them, some species have molecular configurations highly consistent with the zeolite channel structure. The dispersed F35 shows a 33 % longer life in catalytic reactions and a 60 % decreased amount of external thermal cock. An unconventional ‘temperature-determined flexible channel’ mechanism that explains the ‘host–guest’ interactive behavior under catalytic reaction was proposed.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
ZSM-5, Bio-oil upgrading, Deoxygenation, Methanol-to-hydrocarbons, Coke reduction
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-102653 (URN)10.1016/j.cej.2023.147457 (DOI)001119746700001 ()2-s2.0-85177490551 (Scopus ID)
Funder
Swedish Research CouncilSwedish Research Council FormasBio4Energy
Note

Validerad;2023;Nivå 2;2023-11-22 (joosat);

CC BY 4.0 License

Available from: 2023-11-22 Created: 2023-11-22 Last updated: 2024-03-11Bibliographically approved
Yu, L., Kyriazidou, I., Zhou, M. & Hedlund, J. (2023). Highly permeable DDR membranes. Journal of Membrane Science, 687, Article ID 122039.
Open this publication in new window or tab >>Highly permeable DDR membranes
2023 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 687, article id 122039Article in journal (Refereed) Published
Abstract [en]

In this study, DDR membranes with a layer thickness of approximately 700 nm were studied for separation feeds comprising mixtures of CO2 and CH4. The membranes displayed the highest CO2 over CH4 permselectivity and CO2 permeability reported in literature. This was ascribed to a defect-free and ultra-thin zeolite film as well as an open and highly permeable support. For equimolar mixtures, the highest CO2 over CH4 permselectivity of 727 was observed when the pressure at the feed side was 5 bar(a) and the permeate pressure was 1 bar(a) at 25 °C. At these conditions, the CO2 permeability was very high at 45 × 10−7 mol/(m2 s Pa). Separation experiments for 80/20 and 20/80 mixtures were also performed, and in these cases, CO2 over CH4 permselectivities of 1011 and 622 were observed, respectively. For all feeds, the membrane permselectivity decreased slightly at higher temperature and in all cases, higher permselectivity was observed when vacuum was applied at the permeate side. One-stage membrane processes for upgrading biogas to biomethane at three different operating pressures were designed based on the experimental data. In all cases, a quite low membrane area, methane slip and power need were observed.

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
Biogas, Biomethane, CO2 separation, DDR zeolite membrane, High permeability
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-101337 (URN)10.1016/j.memsci.2023.122039 (DOI)001087566300001 ()2-s2.0-85169829212 (Scopus ID)
Funder
Swedish Research Council FormasSwedish Research CouncilBio4Energy
Note

Validerad;2023;Nivå 2;2023-09-13 (joosat);

CC BY-NC-ND 4.0 License

Available from: 2023-09-13 Created: 2023-09-13 Last updated: 2024-03-07Bibliographically approved
Thoresen, P. P., Fahrni, J., Lange, H., Hertzog, J., Carre, V., Zhou, M., . . . Matsakas, L. (2023). On the understanding of bio-oil formation from the hydrothermal liquefaction of organosolv lignin isolated from softwood and hardwood sawdust. Sustainable Energy & Fuels, 7(22), 5361-5373
Open this publication in new window or tab >>On the understanding of bio-oil formation from the hydrothermal liquefaction of organosolv lignin isolated from softwood and hardwood sawdust
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2023 (English)In: Sustainable Energy & Fuels, E-ISSN 2398-4902, Vol. 7, no 22, p. 5361-5373Article in journal (Refereed) Published
Abstract [en]

Conversion of organosolv lignins isolated with and without an inorganic acid catalyst (H2SO4) from hard- and softwood (birch and spruce) into bio-oil through hydrothermal liquefaction has been investigated. Furthermore, fractions of the isolated bio-oils were catalytically deoxygenated to improve the bio-oil properties. As elucidated through NMR, both biomass source and extraction mode influence the bio-oil product distribution. Depending on whether the lignins carry a high content of native structures, or are depolymerized and subsequently condensed in the presence of sugar dehydration products, will dictate heavy oil (HO) and light oil (LO) distribution, and skew the HO product composition, which again will influence the requirements upon catalytical deoxygenation.

Place, publisher, year, edition, pages
Royal Soc Chemistry, 2023
National Category
Bioprocess Technology Wood Science
Research subject
Biochemical Process Engineering; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-101956 (URN)10.1039/d3se00976a (DOI)001080742900001 ()2-s2.0-85174410902 (Scopus ID)
Projects
Upgrading of organosolv lignin to jet fuel (GOLdJET FUEL)Eco-efficient biorefinery for competitive production of green renewable shipping fuels (ECO-FORCE FUELS)
Funder
Swedish Energy Agency, 2019-005832; 2022-201046
Note

Validerad;2023;Nivå 2;2023-11-14 (marisr);

Funder: European Regional Development Fund (FEDER); general council of Moselle, Region Grand Est, Metz Metropole; University of Lorraine (RESEX project);

License fulltext: CC BY

Available from: 2023-10-31 Created: 2023-10-31 Last updated: 2023-11-14Bibliographically approved
Hedlund, J., Zhou, M., Faisal, A., Öhrman, O. G. .., Finelli, V., Signorile, M., . . . Grahn, M. (2022). Controlling diffusion resistance, selectivity and deactivation of ZSM-5 catalysts by crystal thickness and defects. Journal of Catalysis, 410, 320-332
Open this publication in new window or tab >>Controlling diffusion resistance, selectivity and deactivation of ZSM-5 catalysts by crystal thickness and defects
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2022 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 410, p. 320-332Article in journal (Refereed) Published
Abstract [en]

A systematic investigation of two sets of defect free and defective ZSM-5 crystals with controlled thickness (T) between 30 and 400 nm and of their performances in methanol conversion was reported for the first time in the present work. The defect free ZSM-5 crystals with a thickness of 35 nm are by far the smallest ever reported and displayed superior activity, stability and selectivity to slower diffusing compounds, which resulted in high yield of e.g. gasoline and the 1,2,4-trimethylbenzene isomer with high octane number, as compared to the other studied catalysts. Almost only products forming in the zeolite pores were detected and consequently, the external surface must be nearly inactive. Strong correlations between T and deactivation rate were observed. Thick crystals deactivated much faster than thin crystals, probably due to formation of carbon species in the zeolite pores, which results in pronounced percolation effects and faster deactivation of the former. At comparable thickness, crystals with defects deactivated much faster than defect free crystals, due to formation of additional small molecular coke species in the former. Strong correlations between T and selectivity were also observed and assigned to control of diffusion resistance by crystal thickness.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
H-ZSM-5, Defects, Gasoline, Deactivation, MTG
National Category
Chemical Process Engineering Biochemistry and Molecular Biology
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-90477 (URN)10.1016/j.jcat.2022.04.013 (DOI)000799277700003 ()2-s2.0-85129698365 (Scopus ID)
Funder
Swedish Research Council, 2014-04585_VRBio4EnergySwedish Energy Agency, P41164-1
Note

Validerad;2022;Nivå 2;2022-06-01 (hanlid)

Available from: 2022-05-02 Created: 2022-05-02 Last updated: 2023-09-05Bibliographically approved
Nabavi, M. S., Mouzon, J., Zhou, M. & Akhtar, F. (2022). MFI crystal and film growth and defects evolution: Revealed by high resolution electron microscopy: [Crecimiento de películas y cristales de MFI y evolución de defectos; revelado por microscopía electrónica de alta resolución]. Boletín de la Sociedad Espanola de Ceramica y Vidrio, 61(5), 439-452
Open this publication in new window or tab >>MFI crystal and film growth and defects evolution: Revealed by high resolution electron microscopy: [Crecimiento de películas y cristales de MFI y evolución de defectos; revelado por microscopía electrónica de alta resolución]
2022 (English)In: Boletín de la Sociedad Espanola de Ceramica y Vidrio, ISSN 0366-3175, E-ISSN 2173-0431, Vol. 61, no 5, p. 439-452Article in journal (Refereed) Published
Abstract [en]

Mechanism of MFI film growth from seed crystals and evolution of defects during the film growth were investigated. The hydrothermal growth of colloidal silicalite-1 crystals of 50 nm on silicon substrate was used to reveal the MFI film formation mechanism at different time intervals using high resolution-transmission electron microscopy (HR-TEM) and extreme high resolution-scanning electron microscopy (XHR-SEM). It was found that the MFI seeds started to grow in the early stages of hydrothermal treatment from 50 nm to 75 nm in size and connect to the crystals in the vicinity, showing the onset of film formation. The film growth mechanism was led by the sub-colloidal particles in the synthesis solution arriving at the crystal surfaces contributing to the film growth. A continuous film with a thickness of 100 nm was formed after 12 h of hydrothermal treatment containing pinhole defects. Pinhole defects disappeared after 24 h of hydrothermal treatment with a film thickness of 200 nm and grain boundaries thickness of 2 nm were formed. Furthermore, mesoporous defects were found in the grains of the film, which appeared due to the film growth by sub-colloidal particles of synthesis solution. The growth rate of the MFI film was calculated to 0.007 (μm/h) and compared with the crystal growth inside the synthesis solution.

Abstract [es]

Se investigó el mecanismo de crecimiento de películas de MFI a partir de cristales semilla y la evolución de los defectos durante el crecimiento de dichas películas. La síntesis hidrotérmica a partir de cristales coloidales de silicalita-1 de 50 nm sobre sustrato de silicio se utilizó para revelar el mecanismo de formación de la película de MFI en diferentes intervalos de tiempo, utilizando microscopía electrónica de transmisión de alta resolución (HR-TEM) y microscopía electrónica de barrido de extrema alta resolución (XHR-SEM). Se observó que las semillas de MFI comenzaron a crecer en las primeras etapas del tratamiento hidrotérmico de 50 a 75 nm de tamaño y se conectaron a los cristales en las cercanías, evidenciando el inicio de la formación de la película. El mecanismo de crecimiento fue dirigido por las partículas subcoloidales en la solución de síntesis que llegaron a las superficies de los cristales, contribuyendo al crecimiento de la película. Se formó una película continua con un espesor de 100 nm después de 12 h de tratamiento hidrotérmico que contenía orificios. Estos desaparecieron después de 24 h de este mismo tratamiento, habiendo alcanzado un espesor de película de 200 nm, y se formaron límites de grano de 2 nm. Además, se encontraron defectos mesoporosos que aparecieron debido al crecimiento de la película a partir de partículas subcoloidales presentes en la solución de síntesis. La tasa de crecimiento de la película de MFI se calculó en 0,007 (μm/h) y se comparó con el crecimiento de cristales dentro de la solución de síntesis.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
MFI film, Electron microscopy, Crystal, Nanoparticle, Película Mordenite Framework Inverted, Microscopía electrónica, Cristal, Nanopartícula
National Category
Chemical Process Engineering
Research subject
Engineering Materials; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-85863 (URN)10.1016/j.bsecv.2021.03.002 (DOI)2-s2.0-85104518488 (Scopus ID)
Funder
Swedish Research Council Formas, 2016-01099Swedish Research Council, 2018-04407
Note

Validerad;2022;Nivå 2;2022-11-30 (sofila)

Available from: 2021-06-22 Created: 2021-06-22 Last updated: 2023-09-05Bibliographically approved
Zhou, M., Yu, L. & Hedlund, J. (2022). Ultrathin DDR Films with Exceptionally High CO2 Flux and Uniformly Adjustable Orientations. Advanced Functional Materials, 32(18), Article ID 2112427.
Open this publication in new window or tab >>Ultrathin DDR Films with Exceptionally High CO2 Flux and Uniformly Adjustable Orientations
2022 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 32, no 18, article id 2112427Article in journal (Refereed) Published
Abstract [en]

Thin and oriented zeolite films are important for advanced separations, catalysis, and sensing. Strategies for tailoring zeolites for applications include controlling their crystal size, shape, and orientation. Here, three siliceous DDR zeolite ultrathin films with different orientations achieved by homoepitaxial growth from 60 nm-sized seed particles are reported. The 0.5 µm thick membrane shows a separation selectivity of 400 for CO2–CH4 mixtures and CO2 permeance of 25 × 10-7 mol m-2 s-1 Pa-1 at 20 °C and 1 bar, leading to a record-high performance among all reported DDR membranes. Furthermore, the seed nanoparticles are grown into mono-dispersed DDR sub-micron crystals with trigonal and tabular habits. These crystals are assembled in monolayers for the growth of ultrathin and uniformly (h0h)-oriented and c-oriented films with maximum surface pore diameter of 0.365 and 0.263 nm, respectively, by using the 1-adamantanamine template in fluoride medium. The novel strategy not only provides high-performance membrane candidates for industrial CO2 separation, but also inspires interfacial engineering, pore size, and orientation controlling for other microporous crystals, and their membranes.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-89121 (URN)10.1002/adfm.202112427 (DOI)000747307500001 ()2-s2.0-85123723969 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-05-31 (johcin);

Funder: The Swedish Research Council and Formas, a Swedish Research Council for Sustainable development, and Bio4Energy

Available from: 2022-02-07 Created: 2022-02-07 Last updated: 2023-09-16Bibliographically approved
Hedlund, J., Garcia, G., Balsamo, M., Zhou, M. & Mouzon, J. (2021). Microchannel Zeolite 13X Adsorbent with High CO2 Separation Performance. Separation and Purification Technology, 277, Article ID 119483.
Open this publication in new window or tab >>Microchannel Zeolite 13X Adsorbent with High CO2 Separation Performance
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2021 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794, Vol. 277, article id 119483Article in journal (Refereed) Published
Abstract [en]

Uniform 13X films with thicknesses of 3 and 11 µm were grown on supports in the form of steel monoliths with a cell density of 1600 cpsi and microchannels width of 0.5 mm. Sharp breakthrough fronts and a dynamic uptake of 3.4 mmol CO2 g-1 zeolite were observed in the forwarding step of breakthrough experiments for a feed of 10 % CO2 in N2 with a high flow rate at 293 K and 1 bar. Numerical modeling showed that the adsorption process was very fast and that the transport of CO2 in the thin zeolite layer was the rate-limiting step, the mass transfer resistance for the 11 µm film is 2.2 times lower than zeolite 13X pellets and 100 times lower than zeolite 4A beads. Axial dispersion, pressure drop, and gas film resistance were shown to be negligible. The steel monolith support provides good mechanical strength and excellent thermal conductivity for the 13X films. The combination of properties makes this adsorbent a good performer when compared with other types of structured zeolite adsorbents in reported literatures. This microchannel adsorbent is a promising alternative to traditional adsorbents in processes of fast CO2 separation with short cycle times.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Adsorption, Phase separation, Oriented monolayer, Monolithic adsorbents, 13X zeolite, CO2 capture
National Category
Chemical Process Engineering
Research subject
Chemical Technology; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-86749 (URN)10.1016/j.seppur.2021.119483 (DOI)000702863300006 ()2-s2.0-85113172411 (Scopus ID)
Funder
Sida - Swedish International Development Cooperation AgencyÅForsk (Ångpanneföreningen's Foundation for Research and Development)Bio4Energy
Note

Validerad;2021;Nivå 2;2021-09-01 (johcin)

Available from: 2021-08-18 Created: 2021-08-18 Last updated: 2024-03-27Bibliographically approved
Zhang, Q., Zhou, M., Liu, X. & Zhang, B. (2021). Pebax/two-dimensional MFI nanosheets mixed-matrix membranes for enhanced CO2 separation. Journal of Membrane Science, 636, Article ID 119612.
Open this publication in new window or tab >>Pebax/two-dimensional MFI nanosheets mixed-matrix membranes for enhanced CO2 separation
2021 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 636, article id 119612Article in journal (Refereed) Published
Abstract [en]

Zeolite crystals as inorganic fillers were widely applied in fabricating mixed matrix membranes (MMMs) for CO2 separation. The poor filler-matrix interaction and the aggregation of high-loaded fillers in MMMs restrict their advantage of overcoming the trade-off limitation between permeability and selectivity. The novel MMMs with two-dimensional (2D) MFI nanosheets as inorganic fillers and Pebax MH 1657 as the matrix were synthesized and applied to achieve an efficient separation of CO2/CH4 gas mixture for the first time. The large interfacial contact areas between MFI nanosheets and Pebax matrix improve their compatibility to form defect-free MMMs with better mechanical properties. The high-aspect-ratio MFI nanosheets function as solid and selective barriers to make MMMs possess a significant promotion in both CO2 permeability and CO2/CH4 selectivity without the trade-off limitation. The MMM containing 5 wt% of MFI nanosheets exhibited the optimum performance with CO2 permeability of 159.1 Barrer and CO2/CH4 selectivity of 27.4. The as-prepared MMMs showed an improvement of 63.5% in CO2 permeability and 76.4% in CO2/CH4 selectivity, compared to pristine Pebax membranes.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
MFI nanosheets, Zeolite, Mixed matrix membranes, Pebax, CO2/CH4 separation
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-86337 (URN)10.1016/j.memsci.2021.119612 (DOI)000681121500001 ()2-s2.0-85109518619 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-07-15 (beamah);

Forskningsfinansiär: National Natural Science Foundation of China (U20A20152, 21136008)

Available from: 2021-07-12 Created: 2021-07-12 Last updated: 2023-09-05Bibliographically approved
Zhou, M., Nabavi, M. S. & Hedlund, J. (2020). Influence of support surface roughness on zeolite membrane quality. Microporous and Mesoporous Materials, 308, Article ID 110546.
Open this publication in new window or tab >>Influence of support surface roughness on zeolite membrane quality
2020 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 308, article id 110546Article in journal (Refereed) Published
Abstract [en]

Two main types of morphological features resulting in surface roughness were observed on alumina discs used as supports for zeolite membranes. These features can be described as hills and pits and it was shown that defects as cracks formed in the zeolite film at these locations of the support. It was demonstrated that the roughness of the support can be reduced significantly by a polishing strategy developed in this paper. Finally, zeolite MFI membranes grown on the polished support shows remarkably improved quality as compared to films grown on non-polished supports.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Defects, Permporometry, Polishing, SEM, Substrate
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-80492 (URN)10.1016/j.micromeso.2020.110546 (DOI)000571434000005 ()2-s2.0-85089410418 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-08-20 (alebob)

Available from: 2020-08-20 Created: 2020-08-20 Last updated: 2023-09-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7477-4960

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