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Structural analysis of highly porous gamma-Al2O3
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).
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Number of Authors: 7
2014 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 217, 1-8 p.Article in journal (Refereed) Published
Abstract [en]

Two highly porous gamma-aluminas, a commercial catalyst obtained from the calcination of boehmite and a highly mesoporous product obtained from amorphous aluminum (oxy)hydroxide via a sol-gel-based process were investigated by Al-27 nuclear magnetic resonance (NMR), transmission electron microscopy (TEM), and atomic pair distribution function (PDF) analysis of synchrotron powder diffraction data. NMR data showed for both materials a distribution of tetrahedrally and octahedrally coordinated Al at a 0.30:0.70 ratio, which is typical for gamma-aluminas. TEM studies revealed that rod-shaped particles with about 5 nm in thickness are the building blocks of the porous structure in both materials. These particles often extend to a length of 50 nm in the commercial catalyst and are considerably shorter in the sol-gel-based material, which has a higher surface area. Refinement of PDFs revealed the presence of a similar to 1 nm scale local structure and the validity of a tetragonal average structure for both materials. This tetragonal average structure contains a substantial fraction of non-spinel octahedral Al atoms. It is argued that the presence of local structure is a general feature of gamma-alumina, independent of precursor and synthesis conditions. The concentration of non-spinel Al atoms seems to correlate with surface properties, and increases with increasing pore size/surface area. This should have implications to the catalytic properties of porous gamma-alumina.

Place, publisher, year, edition, pages
2014. Vol. 217, 1-8 p.
Keyword [en]
Gamma alumina, Porous materials, Crystal structure, PDF analysis
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-106737DOI: 10.1016/j.jssc.2014.05.004ISI: 000339148800001OAI: oai:DiVA.org:su-106737DiVA: diva2:739151
Note

AuthorCount:7;

Available from: 2014-08-20 Created: 2014-08-19 Last updated: 2017-12-05Bibliographically approved

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Jaworski, AleksanderEdén, MattiasHäussermann, Ulrich
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