Design of stable mixed-metal MIL-101(Cr/Fe) materials with enhanced catalytic activity for the Prins reaction

Cristina Vallés-García, Effrosyni Gkaniatsou, Andrea Santiago-Portillo, Mónica Giménez-Marqués, Mercedes Álvaro, Jean Marc Greneche, Nathalie Steunou, Clémence Sicard, Sergio Navalón, Christian Serre, Hermenegildo García

Research output: Contribution to journalArticlepeer-review

Abstract

This work highlights the benefit of designing mixed-metal (Cr/Fe) MOFs for enhanced chemical stability and catalytic activity. A robust and stable mixed-metal MIL-101(Cr/Fe) was prepared through a HF-free direct hydrothermal route with Fe3+ content up to 21 wt%. The incorporation of Fe3+ cations in the crystal structure was confirmed by 57Fe Mössbauer spectrometry. The catalytic performance of the mixed metal MIL-101(Cr/Fe) was evaluated in the Prins reaction. MIL-101(Cr/Fe) exhibited a higher catalytic activity compared to MIL-101(Cr), improved chemical stability compared to MIL-101(Fe) and a higher catalytic activity for bulky substrates compared to MIL-100(Fe). In situ infra-red spectroscopy study suggests that the incorporation of Fe3+ ions in MIL-101 structure leads to an increase in Lewis acid sites. It was thus concluded that the predominant role of Cr3+ ions was to maintain the crystal structure, while Fe3+ ions enhanced the catalytic activity.

Original languageEnglish
Pages (from-to)17002-17011
Number of pages10
JournalJournal of Materials Chemistry A
Volume8
Issue number33
DOIs
Publication statusPublished - 7 Sep 2020
Externally publishedYes

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