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Rational synthesis of aerosol-assisted alumina powders having uniform mesopores and highly accessible surfaces

Abstract

Alumina is one of the most useful inorganic solids because its γ-phase has frequently been applied as catalytic supports and those having high porosity have been strongly demanded for the enhancement of catalytic properties by increasing dispersion of metal catalysts. From the viewpoint, a synthetic strategy using amphiphilic organic molecules has attracted much attention for obtaining a wide variety of mesoporous inorganic solids having enough surface areas. However, it has so far been quite difficult to prepare such mesoporous alumina powders because starting aluminum sources like their chlorides and alkoxides show high reactivities in the presence of water. And thus, the formation of composite micelles and subsequent organization of highly porous structures have been achieved under very restricted synthetic conditions. Following to our recent insight on an aerosol-assisted synthesis for obtaining mesoporous alumina powders having high surface area (nearly 540 m2 g-1) with an enhancement of the connectivity between surfactant-assisted mesopores, in this study we can clarify another rational and reliable synthetic route in order to obtain high-surface-area mesoporous alumina powders (more than 500 m2 g-1). Several important factors for increasing the quality of aerosol-assisted mesoporous alumina powders (e.g., sphericity of alumina particles and connectivity of surfactant-assisted mesopores) were also summarized, being mainly supported by TEM and SEM observations and N2 adsorption measurements.

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Publication details

The article was received on 13 Mar 2019, accepted on 03 Apr 2019 and first published on 04 Apr 2019


Article type: Paper
DOI: 10.1039/C9NJ01319A
Citation: New J. Chem., 2019, Accepted Manuscript

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    Rational synthesis of aerosol-assisted alumina powders having uniform mesopores and highly accessible surfaces

    H. Maruoka and T. Kimura, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ01319A

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