Spray-Freeze-drying (SFD) is a drying method often encountered in pharmaceutical industry as well as in the processing of food. With this procedure, thermo-labile compounds can be dried at low temperatures to produce spherical porous particles and forming high-surface area systems. Indeed, using this method, a solvent can be removed without exposing the systems to tensile forces of a receding meniscus. Therefore, it is a suitable drying technique to develop porosity in inorganic and polymeric materials. For catalyst preparation, freeze-drying has been suggested to reduce precursor solution mobility during drying and therefore control the location of deposition of the precursor phase. Moreover, the technique can be utilized to the homogeneous embedding of the active phases into the support, minimizing the possibility of phase separation on a molecular scale, as also demonstrated for drugs. Nevertheless, few applications have been reported in the catalytic field until now. In this work, SPD was successfully applied for the preparation of polymer/oxides composites (perfluorosulfonic superacid resin- Aquivion® PFSA with various oxides) with very high surface area and homogeneous dispersion of different components.

Composizione solida per la catalisi eterogenea e relative procedimento di preparazione

Albonetti Stefania;Fornasari Giuseppe;Andreoli Sara;Bacile Riccardo
2018

Abstract

Spray-Freeze-drying (SFD) is a drying method often encountered in pharmaceutical industry as well as in the processing of food. With this procedure, thermo-labile compounds can be dried at low temperatures to produce spherical porous particles and forming high-surface area systems. Indeed, using this method, a solvent can be removed without exposing the systems to tensile forces of a receding meniscus. Therefore, it is a suitable drying technique to develop porosity in inorganic and polymeric materials. For catalyst preparation, freeze-drying has been suggested to reduce precursor solution mobility during drying and therefore control the location of deposition of the precursor phase. Moreover, the technique can be utilized to the homogeneous embedding of the active phases into the support, minimizing the possibility of phase separation on a molecular scale, as also demonstrated for drugs. Nevertheless, few applications have been reported in the catalytic field until now. In this work, SPD was successfully applied for the preparation of polymer/oxides composites (perfluorosulfonic superacid resin- Aquivion® PFSA with various oxides) with very high surface area and homogeneous dispersion of different components.
2018
102018000006967
Albonetti Stefania, Fornasari Giuseppe, Andreoli Sara, Bacile Riccardo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/672688
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