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    Foams Stabilized by Aquivion (TM) PFSA: Application to Interfacial Catalysis for Cascade Reactions

    Year: 2022

    Journal: Adv. Mater. Interfaces, Volume 9, JUL

    Authors: Feng, Andong; Dedovets, Dmytro; Zhang, Shi; Sha, Jin; Schwiedernoch, Renate; Gao, Jie; Gu, Yunjiao; Pera-Titus, Marc

    Organizations: ERC grant Michelangelo [771586]

    Keywords: Aquivion (TM); cascade reactions; catalysis; foams; perfluorosulfonic acid

    Foams are attractive platforms for engineering gas-liquid-solid catalytic microreactors with enhanced triphasic contact. In this study, the foaming properties of surface-active Aquivion (TM) perfluorosulfonic acid resin (Aquivion (TM) PFSA) are unraveled. Stable aqueous and non-aqueous foams are prepared driven by hydrogen bond interactions between Aquivion (TM) PFSA and protic solvents (e.g., benzyl alcohol, aniline, water). In light of these unique properties, a catalytic foam system for one-pot cascade deacetalization-hydrogenation reactions is designed. As proof of concept, benzaldehyde dimethyl acetal is converted into benzyl alcohol with 84% overall yield at room temperature in a foam system in the presence of Aquivion (TM) PFSA and Pd/SiO2 catalysts, whereas the yield is halved in a non-foam system. The enhanced reaction efficiency is attributed to a marked increase in interfacial area of the foam system and preferential location of catalytic acid centers at the gas-liquid interface.
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