Papers by Michela Valentini
Catalysis Today, 2001
Deposition of ␥-Al 2 O 3 washcoats onto Aluminium and FeCrAlloy ® supports in the form of slabs a... more Deposition of ␥-Al 2 O 3 washcoats onto Aluminium and FeCrAlloy ® supports in the form of slabs and onto ␣-Al 2 O 3 tubes was performed according to a two-step procedure involving: (a) deposition of a bohemite primer, (b) deposition of the ␥-Al 2 O 3 layer, both by dip coating into powder dispersions in HNO 3 aqueous solutions. We present herein data concerning the effects of the major preparation variables (HNO 3 and H 2 O concentrations in the dispersion, withdrawal velocity, drying temperature, number of dipping cycles, calcination temperature) on the deposited coating load and on the adherence of the washcoat. Based on a rheological characterisation of the ␥-Al 2 O 3 dispersions, we propose also a correlation between their apparent viscosity and the washcoat load. Finally, we briefly illustrate the activity in catalytic combustion reactions of structured Pd-based catalysts prepared according to the investigated washcoating methods.
Studies in Surface Science and Catalysis, 2000
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Papers by Michela Valentini