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Impregnation of zeo...
Impregnation of zeolite membranes for enhanced selectivity
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- Lindmark, Jonas (författare)
- Luleå tekniska universitet (LTU),Luleå University of Technology (LTU)
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- Hedlund, Jonas (författare)
- Luleå tekniska universitet,Industriell miljö- och processteknik
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- Wirawan, Sang, 1973 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Creaser, Derek, 1966 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Department of Chemical and Biological Engineering
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- Li, Mingrun (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University,Department of Materials and Environmental Chemistry, Berzelii Center EXSELENT on Porous Materials, Stockholm University
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- Zhang, Daliang (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University,Department of Materials and Environmental Chemistry, Berzelii Center EXSELENT on Porous Materials, Stockholm University
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- Zou, Xiaodong (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University,Department of Materials and Environmental Chemistry, Berzelii Center EXSELENT on Porous Materials, Stockholm University
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(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- Engelska.
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Ingår i: Journal of Membrane Science. - : Elsevier BV. - 0376-7388 .- 1873-3123. ; 365:1-2, s. 188-197
- Relaterad länk:
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://research.cha...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- A new method to enhance the selectivity of zeolite membranes for alternative separation tasks has been developed. Calcined MFI membranes were impregnated with a solution of Ca(NO3)2 in methanol and calcined at 600 °C to thermally decompose the nitrate. SEM and EDS data indicated that calcium compounds were evenly distributed in the entire MFI film and in addition, a few crystals of a calcium compound were observed on top of the film in some locations. A HR-TEM investigation showed that calcium compounds were present in low concentration in the sample and that the interiors of the MFI crystals remained fully crystalline after impregnation and calcination. However, the HR-TEM investigation could neither confirm nor rule out the occurrence of calcium compounds in the pores in the interiors of the crystals. In accordance with the SEM and TEM observations, XRD data showed that calcium compounds on top of the film were relatively large CaCO3 crystals and that the zeolite film remained crystalline after impregnation. However, eventual calcium compounds in the pores of the zeolite could not be studied by XRD since these would probably generate a very weak signal of amorphous material. FTIR data indicated that impregnation increased the amount of both physisorbed and chemisorbed CO2, the latter resulting in carbonate species in the film. n-Hexane/helium adsorption branch permporometry showed that the high quality of the membranes remained after modification. The single component permeance ratio CO2/H2 increased from 0.6 to 1.5 after impregnation. Calculations indicated that the increased CO2/H2 single component permeance ratios were both an effect of increased adsorption of CO2 in the film and reduced pressure drop in the support. The dual component separation factor α CO2/H2 at room temperature increased drastically from 0.7 (H2 selective) to 3.4 (CO2 selective) after impregnation. This work shows for the first time that impregnation procedures can be used to tailor the diffusion properties of zeolite membranes in a similar way as impregnation procedures are used to tailor the catalytic performance of catalysts.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Zeolite membrane
- Impregnation
- Carbon dioxide
- Separation
- Selectivity
- Inorganic chemistry
- Oorganisk kemi
- Kemisk teknologi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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