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Colloidal processing and CO2-capture performance of hierarchically porous Al2O3-zeolite 13X composites
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2012 (English)In: Journal of Ceramic Science and Technology, ISSN 2190-9385, Vol. 3, no 1, 9-16 p.Article in journal (Refereed) Published
Abstract [en]

Hierarchically porous composites for CO2-capture have been produced by coating the inner walls of foam-like macroporous alumina monoliths, produced by templated synthesis, with microporous zeolite 13X particles. Homogeneous and dense coatings of the particulate adsorbent were obtained when the impregnation process was performed at a pH above 9. At this pH-level the colloidally stable suspensions of the negatively charged zeolite 13X particles could fill all the voids of the highly connected pore space of the alumina supports and attach to the monolith walls, which had been pre-coated with poly(ethylene imine). A CO2-uptake as high as 5 mmol CO2/g zeolite 13X was achieved for alumina-zeolite 13X composites through minimisation of the added inorganic binder, kaolin, to only 3.0 wt% with respect to zeolite content, and through optimisation of the thermal treatment.

Place, publisher, year, edition, pages
2012. Vol. 3, no 1, 9-16 p.
Keyword [en]
CO2 uptake, adsorption, zeolite, macroporous, porosity, colloids, dispersions, ceramic, processing
National Category
Materials Chemistry
Research subject
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-54662DOI: 10.4416/JCST2012-00039OAI: oai:DiVA.org:su-54662DiVA: diva2:396572
Available from: 2011-02-10 Created: 2011-02-10 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Shaping Macroporous Ceramics: templated synthesis, X-ray tomography and permeability
Open this publication in new window or tab >>Shaping Macroporous Ceramics: templated synthesis, X-ray tomography and permeability
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Macroporous ceramic materials have found widespread technological application ranging from particulate filters in diesel engines, tissue engineering scaffolds, and as support materials in carbon capture processes. This thesis demonstrates how the pore space of macroporous alumina can be manipulated, analysed in three-dimensions (3D) using visualisation techniques, and functionalised with a CO2-adsorbing material.

A novel method was developed to produce macroporous alumina materials: by combining sacrificial templating with thermally expandable polymeric microspheres and gel-casting of an alumina suspension. This method offers a versatile production of macroporous ceramics in which the level of porosity and the pore size distribution can easily be altered by varying the amount and type of spheres. The permeability to fluid flow could be regulated by controlling the connectivity of the pore space and the size of the smallest constrictions between the pores. Sacrificial templating with particle-coated expandable spheres significantly increased the fraction of isolated pore clusters and reduced both the sizes and the numbers of connections between neighbouring pores, compared to templating with un-coated spheres.

The macroporous alumina materials were characterised with X-ray micro-computed tomography (μ-CT). The 3D data-sets obtained by X-ray μ-CT were used to calculate the spatial variation in porosity, the throat and pore size distributions and to calculate the permeability to fluid flow. The throat and pore size distributions were also able to be accurately quantified in only one extrusion and intrusion cycle with water-based porosimetry; a relatively novel and simple characterisation technique. The pore walls of the macroporous alumina materials were also coated with zeolite films by a colloidal processing technique. The CO2-uptake of the coated alumina materials and of hierarchically porous monoliths of zeolites was evaluated and compared.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry, Stockholm University, 2011. 60 p.
Keyword
Alumina, ceramic, CO2 capture, colloidal processing, expandable microspheres, gel casting, layer-by-layer, macroporosity, near-net shape, non-destructive evaluation, permeability, porosity, sacrificial templating, X-ray computed tomography
National Category
Chemical Sciences
Research subject
Materials Chemistry
Identifiers
urn:nbn:se:su:diva-54677 (URN)978-91-7447-180-9 (ISBN)
Public defence
2011-03-11, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
As the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 4: Accepted. Paper 5: Manuscript. Paper 6: Submitted.Available from: 2011-02-17 Created: 2011-02-10 Last updated: 2011-02-11Bibliographically approved

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Andersson, LinnéaAkhtar, FaridOjuva, ArtoBergström, Lennart
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