Details

Autor(en) / Beteiligte

• Shumilov, Vladimir
• Kirilin, Alexey
• Tokarev, Anton
• Boden, Stephan
• Schubert, Markus
• Hampel, Uwe
• Hupa, Leena
• Salmi, Tapio
• Murzin, Dmitry Yu

Titel

Preparation of γ-Al2O3/α-Al2O3 ceramic foams as catalyst carriers via the replica technique

Ist Teil von

• Catalysis today, 2022-01, Vol.383, p.64-73

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• [Display omitted] •Preparation of open-cell ceramic foams by polyurethane sponge replica technique.•Optimization of adhesion by etching with NaOH and coating with colloidal silica.•Coating of α-alumina with layers of γ-alumina.•Deposition of platinum on the foams by impregnation.•Elucidation of activity in hydrogenation of ethyl benzoylformate. This work describes an effective method for the preparation of open-cell ceramic foams for their further use as catalyst supports. The polyurethane sponge replica technique was applied using a ceramic suspension based on a mixture of α-alumina, magnesia and titania and polyvinyl alcohol solution as a liquid component. The polyurethane sponge was etched with NaOH and covered with colloidal silica to obtain better adhesion of the slurry to the walls of the polymeric material onto it. The surface area of the ceramic carrier was increased by adding a layer of γ-alumina. Deposition of an active catalytic phase (Pt) was done by impregnation. Properties of the carriers and the final catalyst were investigated by a number of physico-chemical methods such as TEM, SEM, XRD and computer tomography. Hydrogenation of ethyl benzoylformate was performed to elucidate the catalytic properties of foam catalysts illustrating their applicability.