Reproducibility in the preparation of alumina slurries for washcoat application—Role of temperature and particle size distribution

The deposition of thick layers of γ-Al 2O 3 is often performed by the washcoating method consisting of immersing the object to coat in a slurry containing γ-Al 2O 3 powder and nitric acid. Although this method gives very satisfying results in terms of adherence and BET surface, it shows a bad reprod...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2009-03, Vol.336 (1), p.104-109
Main Authors: Meille, Valérie, Pallier, Stéphanie, Rodriguez, Philippe
Format: Article
Language:English
Subjects:
Al 2O 3
Catalysis
Chemical Sciences
Colloids
Gel
Slurry
Structured catalytic reactors
Suspensions
Washcoating
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Summary:The deposition of thick layers of γ-Al 2O 3 is often performed by the washcoating method consisting of immersing the object to coat in a slurry containing γ-Al 2O 3 powder and nitric acid. Although this method gives very satisfying results in terms of adherence and BET surface, it shows a bad reproducibility in terms of viscosity of the slurry and thus layer thickness. Characterizations of the slurry were performed at different preparation steps to try to understand and control the chemistry involved.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2008.11.029