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Adsorption of Water and Butanol in Silicalite-1 Film Studied with in-situ ATR-FTIR Spectroscopy
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-7477-4960
Department of Materials and Environmental Chemistry, Stockholm University.
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2015 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 31, no 17, p. 4887-4894Article in journal (Refereed) Published
Abstract [en]

Biobutanol produced by, e.g., acetone–butanol–ethanol (ABE) fermentation is a promising alternative to petroleum-based chemicals as, e.g., solvent and fuel. Recovery of butanol from dilute fermentation broths by hydrophobic membranes and adsorbents has been identified as a promising route. In this work, the adsorption of water and butanol vapor in a silicalite-1 film was studied using in situ attenuated total reflectance–Fourier transform infrared (ATR–FTIR) spectroscopy to better understand the adsorption properties of silicalite-1 membranes and adsorbents. Single-component adsorption isotherms were determined in the temperature range of 35–120 °C, and the Langmuir model was successfully fitted to the experimental data. The adsorption of butanol is very favorable compared to that of water. When the silicalite-1 film was exposed to a butanol/water vapor mixture with 15 mol % butanol (which is the vapor composition of an aqueous solution containing 2 wt % butanol, a typical concentration in an ABE fermentation broth, i.e., the composition of the gas obtained from gas stripping of an ABE broth) at 35 °C, the adsorption selectivity toward butanol was as high as 107. These results confirm that silicalite-1 quite selectively adsorbs hydrocarbons from vapor mixtures. To the best of our knowledge, this is the first comprehensive study on the adsorption of water and butanol in silicalite-1 from vapor phase.

Abstract [sv]

Bio-butanol produced by e.g. acetone–butanol–ethanol (ABE) fermentation is a promising alternative to petroleum-based chemicals as e.g. solvent and fuel. Recovery of butanol from dilute fermentation broths by hydrophobic membranes and adsorbents has been identified as a promising route. In this work, the adsorption of water and butanol vapor in a silicalite-1 film was studied using in-situ ATR-FTIR spectroscopy in order to better understand the adsorption properties of silicalite-1 membranes and adsorbents. Single component adsorption isotherms were determined in the temperature range of 35-120°C and the Langmuir model was successfully fitted to the experimental data. The adsorption of butanol is very favorable compared to that of water. When the silicalite-1 film was exposed to a butanol/water vapor mixture with 15 mol% of butanol (which is the vapor composition of an aqueous solution containing 2 wt% of butanol, a typical concentration in an ABE fermentation broth, i.e. the composition of the gas obtained from gas stripping of an ABE broth) at 35 °C, the adsorption selectivity towards butanol was as high as 107. These results confirm that silicalite-1 quite selectively adsorbs hydrocarbons from vapor mixtures.

Place, publisher, year, edition, pages
2015. Vol. 31, no 17, p. 4887-4894
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-11363DOI: 10.1021/acs.langmuir.5b00489ISI: 000354154100010PubMedID: 25871262Scopus ID: 2-s2.0-84928975335Local ID: a506afed-96a6-4841-b99b-143794fb680dOAI: oai:DiVA.org:ltu-11363DiVA, id: diva2:984313
Note
Validerad; 2015; Nivå 2; 20150420 (magr)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
In thesis
1. Adsorption Properties of MFI-Type Zeolite Films for Upgrading of Biofuels
Open this publication in new window or tab >>Adsorption Properties of MFI-Type Zeolite Films for Upgrading of Biofuels
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

With the depleting reservoirs of fossil fuels, increasing environmental concerns for flue-gas emissions from fossil-fuel combustion and growing world population, the need for the development of new sustainable fuels is higher than ever. However, to be able to compete with today’s mature technologies for production of fuels from fossil sources, new efficient processing alternatives for upgrading of biofuels must be developed.

   Bio-fuels produced by e.g. fermentative processes are promising alternatives to traditional chemicals and fuels produced from fossil sources. Recovery of biofuels by selective membranes and adsorbents has been identified as promising energy efficient recovery routes.

In this work, adsorption properties of MFI-type zeolite films were studied using in situ ATR-FTIR spectroscopy in order to understand the adsorption properties of these zeolites.

   Single component adsorption isotherms of butanol and water vapor were determined at different temperatures using ATR-FTIR spectroscopy. The Langmuir and Sips model were successfully fitted to experimental data, and the fitted parameters obtained in this work were in very good agreement with values reported in the literature. Adsorbed amounts of butanol and water from binary vapor mixtures were extracted from the infrared spectra as well as the adsorption selectivities. The silicalite-1 film prepared in fluoride medium found to be significantly more butanol selective due to the exceptionally low density of defects in the structure.

   Biogas (methane) is another promising biofuel that is commonly produced by anaerobic degradation of biomass. However, before it may be used, contaminants have to be removed from the gas; two of the most abundant contaminants in biogas are carbon dioxide and water vapor. Adsorption of a ternary mixture of methane, carbon dioxide and water vapor in zeolite Na-ZSM-5 has been studied at various compositions and temperatures using ATR–FTIR spectroscopy. The amount adsorbed determined from experimental data were compared to predictions by the Ideal Adsorbed Solution Theory (IAST). This result confirms that Na-ZSM-5 could be a promising membrane material for upgrading of biogas.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2016
National Category
Engineering and Technology Chemical Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-60958 (URN)978-91-7583-781-9 (ISBN)978-91-7583-782-6 (ISBN)
Public defence
2017-02-20, C305, Luleå tekniska universitet, 10:00
Opponent
Supervisors
Available from: 2016-12-09 Created: 2016-12-07 Last updated: 2018-08-17Bibliographically approved

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Farzaneh, AmirfarrokhZhou, MingPotapova, ElisavetaOhlin, LindsayHolmgren, AllanHedlund, JonasGrahn, Mattias

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