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Fluidized Bed CVD of [5]Al-rich amorphous alumina on powders for catalysis applications

Caussat, Brigitte and Samélor, Diane and Gleizes, Alain and Sarou-Kanian, Vincent and Florian, Pierre and Vahlas, Constantin Fluidized Bed CVD of [5]Al-rich amorphous alumina on powders for catalysis applications. (2018) In: STP 2018, 3 July 2018 - 5 July 2018 (Compiègne, France).

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Producing alumina catalysts containing high amounts of penta-coordinated aluminum sites ([5]Al) is of main interest to develop a green production of olefins from biomass. Inspired from an original process developed on planar substrates at low pressure, a Fluidized Bed Chemical Vapor Deposition (CVD) process coupled to a DLI (Direct Liquid Injection) system has been studied at atmospheric pressure to deposit amorphous alumina on soluble NaCl powders, using dimethyl aluminum isopropoxide (DMAI) as precursor. A set of experiments has been performed at 310°C, showing the good reproducibility of the deposition process in terms of deposit morphology, mass and chemical composition. Nuclear Magnetic Resonance of aluminum-27 probing the structure at atomic scale of the deposit indicates the presence of high contents of penta-coordinated aluminum, as it was the case on planar substrates. This demonstrates that this DLI-CVD route from DMAI is robust. Coupled with a fluidized bed, it could lead to massive production of high specific surface area amorphous alumina with high content of penta-coordinated aluminum environments.

Item Type:Conference or Workshop Item (Other)
Audience (conference):National conference without published proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:08 Feb 2019 14:43

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