Phosphonate-Modified UiO-66 Brønsted Acid Catalyst and Its Use in Dehydra-Decyclization of 2-Methyltetrahydrofuran to Pentadienes

Matheus Dorneles de Mello, Gaurav Kumar, Tarnuma Tabassum, Sheetal K. Jain, Tso Hsuan Chen, Stavros Caratzoulas, Xinyu Li, Dionisios G. Vlachos, Songi I. Han, Susannah L. Scott, Paul Dauenhauer, Michael Tsapatsis

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Phosphorus-modified all-silica zeolites exhibit activity and selectivity in certain Brønsted acid catalyzed reactions for biomass conversion. In an effort to achieve similar performance with catalysts having well-defined sites, we report the incorporation of Brønsted acidity to metal–organic frameworks with the UiO-66 topology, achieved by attaching phosphonic acid to the 1,4-benzenedicarboxylate ligand and using it to form UiO-66-PO3H2 by post-synthesis modification. Characterization reveals that UiO-66-PO3H2 retains stability similar to UiO-66, and exhibits weak Brønsted acidity, as demonstrated by titrations, alcohol dehydration, and dehydra-decyclization of 2-methyltetrahydrofuran (2-MTHF). For the later reaction, the reported catalyst exhibits site-time yields and selectivity approaching that of phosphoric acid on all-silica zeolites. Using solid-state NMR and deprotonation energy calculations, the chemical environments of P and the corresponding acidities are determined.

Original languageEnglish (US)
Pages (from-to)13260-13266
Number of pages7
JournalAngewandte Chemie - International Edition
Volume59
Issue number32
DOIs
StatePublished - Aug 3 2020

Keywords

  • biomass conversion
  • metal–organic frameworks
  • phosphonates
  • solid Brønsted acids

PubMed: MeSH publication types

  • Journal Article

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    Dorneles de Mello, M., Kumar, G., Tabassum, T., Jain, S. K., Chen, T. H., Caratzoulas, S., Li, X., Vlachos, D. G., Han, S. I., Scott, S. L., Dauenhauer, P., & Tsapatsis, M. (2020). Phosphonate-Modified UiO-66 Brønsted Acid Catalyst and Its Use in Dehydra-Decyclization of 2-Methyltetrahydrofuran to Pentadienes. Angewandte Chemie - International Edition, 59(32), 13260-13266. https://doi.org/10.1002/anie.202001332