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Crack formation in ...
Crack formation in α-alumina supported MFI zeolite membranes studied by in situ high temperature synchrotron powder diffraction
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- Gualtieri, Magdalena Lassinantti (författare)
- Luleå tekniska universitet
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- Andersson, Charlotte (författare)
- Luleå tekniska universitet,Institutionen för samhällsbyggnad och naturresurser
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- Jareman, Fredrik (författare)
- Luleå tekniska universitet
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- Hedlund, Jonas (författare)
- Luleå tekniska universitet,Industriell miljö- och processteknik
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- Gualtieri, Alessandro F. (författare)
- Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, Modena, Italy
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- Leoni, Matteo (författare)
- Dipartimento di Ingegneria dei Materiali, Università di Trento, Mesiano, Italy
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- Meneghini, Carlo (författare)
- Dipartimento di Fisica ‘E. Amaldi’ Università di Roma Tre, Roma, Italy
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(creator_code:org_t)
- Elsevier BV, 2007
- 2007
- Engelska.
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Ingår i: Journal of Membrane Science. - : Elsevier BV. - 0376-7388 .- 1873-3123. ; 290:1-2, s. 95-104
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Cracks are frequently formed in α-alumina supported MFI membranes during calcination. To better understand crack formation, in situ powder diffraction data were collected during calcination of a type of MFI membrane (ca. 1800 nm thick) which is known to crack reproducibly. In addition, data for MFI powder and a blank support were also collected. Both a synchrotron radiation facility and an in-house instrument were used. The unit cell parameters were determined with the Rietveld method, and the strain in the direction perpendicular to the film surface was calculated for the film as well as for the support. The microstrain in the support was also estimated. Based on the results obtained here, a model for crack formation in this type of MFI membrane was proposed. The lack of cracks in other types of MFI membranes (ca. 500 nm) prepared in our laboratory is also explained by the model. In thicker MFI films, the crystals are well intergrown. During heating, the MFI crystals contract and the α-alumina support expands. Consequently, a thermal stress develops in the composite which eventually leads to formation of cracks in the film and structural defects in the support. In thinner films, the crystals are less well intergrown and the thermal expansion mismatch leads to opening of grain boundaries rather than cracks.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
Nyckelord
- MFI zeolite membrane
- In situ study
- Synchrotron powder diffraction
- Crack formation
- Rietveld method
- Chemical Technology
- Kemisk teknologi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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