Salen- Zr(IV) complex grafted into amine-tagged MIL-101(Cr) as a robust multifunctional catalyst for biodiesel production and organic transformation reactions

Hassan M. A. Hassan, Mohamed A. Betiha, Shaimaa K. Mohamed, E. A. El-Sharkawy, Emad A. Ahmed

Research output: Contribution to journalJournal articlepeer-review

38 Scopus citations

Abstract

The synthesis of metal-organic frameworks (MOFs), porous coordination polymers with functional groups has received immense interest due to the functional groups can offer desirable properties and allow post-synthetic modification. Herein, for the first time, Zr(IV)-Sal Schiff base complex incorporated into amino-functionalized MIL-101(Cr) framework by salicylaldehyde condensing to amino group, and coordinating Zr(IV) ion have been successfully synthesized. The worthiness of the synthesized material as a catalyst has been examined for the esterification of oleic acid (free fatty acid) with methanol producing biodiesel (methyl oleate), Knoveonagel condensation reaction of aldehydes and Friedel–Crafts acylation of anisole. Our findings demonstrated that Salen-Zr(IV) grafted to framework of NH 2 -MIL-101(Cr) as a solid acid catalyst exhibited distinct catalytic performance for the production of biodiesel by esterification of oleic acid with methanol, Knoveonagel condensation and Friedel–Crafts acylation. These could be attributed to high surface area which allow high distribution of Zr(IV) species lead to a sufficient contact with the reactants species. Furthermore, the catalyst showed excellent recycling efficiency due to the strong interaction between the Zr(IV) ions and chelating groups in the NH 2 -MIL-101(Cr)-Sal.

Original languageEnglish
Pages (from-to)394-404
Number of pages11
JournalApplied Surface Science
Volume412
DOIs
StatePublished - 1 Aug 2017
Externally publishedYes

Keywords

  • Biodiesel production
  • Friedel–Crafts acylation
  • Knoveonagel condensation
  • NH -MIL-101(Cr)
  • Zr(IV)-Sal Schiff base

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