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Communication Dans Un Congrès Année : 2018

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

Résumé

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.
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Dates et versions

hal-04384173 , version 1 (10-01-2024)

Identifiants

  • HAL Id : hal-04384173 , version 1

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Brigitte Caussat, Diane Samélor, Alain Gleizes, V Sarou-Kanian, P Florian, et al.. Fluidized Bed CVD of [5]Al-rich amorphous alumina on powders for catalysis applications. STP 2018, Jul 2018, Compiègne (FR), France. ⟨hal-04384173⟩
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