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Exploring the Brønsted Acidity of UiO-66 (Zr, Ce, Hf) Metal-Organic Frameworks for Efficient Solketal Synthesis from Glycerol Acetalization

Abstract

High surface Metal-organic frameworks (MOFs) have emerged as a new class of heterogeneous catalysts due to their well defined pore surface chemistry which allows much desired structure-activity relation to be established. In this work, we used this advantage of MOFs to systematically tune the acidity of chemically stable UiO-66 MOFs by changing the metal ions(Zr, Hf and Ce) in their secondary building units. Zr, Ce, Hf-based isostructural UIO-66 MOFs exhibited varying degree of Brønsted acidity (UiO-66(Hf)>UiO-66(Ce)>UiO-66(Zr)) ontheir secondary building units owing to their differnces in their oxophilities. UIO-66(Hf) showed remarkable catalytic activity for solketal synthesis with turnover frequency as high as 13,886 h-1 which is 90 times higher than UiO-66(Zr) and several order higher when compared to H2SO4 or Zeolites.

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Publication details

The article was received on 29 Aug 2018, accepted on 02 Dec 2018 and first published on 03 Dec 2018


Article type: Communication
DOI: 10.1039/C8DT03512A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Exploring the Brønsted Acidity of UiO-66 (Zr, Ce, Hf) Metal-Organic Frameworks for Efficient Solketal Synthesis from Glycerol Acetalization

    V. R. Bakuru, S. R. Churipard, S. P. Maradur and S. B. Kalidindi, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03512A

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