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Dual-functionalized ZIF-8 as an efficient acid-base bifunctional catalyst for the one-pot tandem reaction.

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Title: Dual-functionalized ZIF-8 as an efficient acid-base bifunctional catalyst for the one-pot tandem reaction.
Authors: Lee, Yu-Ri1 (AUTHOR), Do, Xuan Huy1,2 (AUTHOR), Hwang, Seung Sang1 (AUTHOR), Baek, Kyung-Youl1,2,3 (AUTHOR) baek@kist.re.kr
Source: Catalysis Today. Jan2021, Vol. 359, p124-132. 9p.
Subjects: Catalysts, Base catalysts, Heterogeneous catalysts, Ring-opening reactions, Condensation reactions, Catalytic activity, Electrocatalysts
Abstract: • Acid-base dual-functional ZIF-8 (ZIF8-A61-SO 3 H) was prepared via post-synthetic modification. • ZIF8-A61-SO 3 H catalyst showed high catalytic performance in one-pot tandem deactalization-Knoevenagel condensation reaction. • Catalytic activity of ZIF8-A61-SO 3 H was compared with ZIF-8 and amine-functionalized ZIF-8 catalysts. • A plausible catalytic reaction mechanism was proposed. An acid-base bifunctional zeolitic imidazolate framework catalyst (ZIF8-A61-SO 3 H) with amine and sulfonic acid groups was successfully prepared through simple two step post-synthetic modification: preparation of amine-functionalized ZIF-8 with amine contents of 61% (ZIF8-A61) by the ligand exchange of 2-mIM with 3-amino-1,2,4-triazole (Atz), followed by the sulfonic acid functionalization by the ring-opening reaction of 1,3-propanesultone with –NH 2 groups in ZIF8-A61. Amine-functionalized ZIF8-A materials with difference amine contents (15%, 34%, and 61%, respectively) were also prepared by controlling the synthesis time. All obtained ZIF catalysts evaluated as a heterogeneous catalyst for one-pot deacetalization-Knoevenagel condensation tandem reaction. Compared with ZIF-8 and amine-functionalized ZIF-8 catalysts, ZIF8-A61-SO 3 H catalyst showed good catalytic performance with 100% conversion of the reactant and 98% selectivity of the final Knoevenagel product. An enhanced catalytic activity can be attributed to the co-existence of site-isolated acid-base groups on the ZIF8-A61-SO 3 H catalyst in close proximity. The heterogeneous nature of the catalytic system was confirmed by a hot-filtering test and the catalyst also exhibited reusable in the five repeated cycles. A plausible catalytic mechanism of deacetalization-Knoevenagel condensation reaction over ZIF8-A61-SO 3 H was also proposed. [ABSTRACT FROM AUTHOR]
Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Dual-functionalized ZIF-8 as an efficient acid-base bifunctional catalyst for the one-pot tandem reaction.
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  Data: • Acid-base dual-functional ZIF-8 (ZIF8-A61-SO 3 H) was prepared via post-synthetic modification. • ZIF8-A61-SO 3 H catalyst showed high catalytic performance in one-pot tandem deactalization-Knoevenagel condensation reaction. • Catalytic activity of ZIF8-A61-SO 3 H was compared with ZIF-8 and amine-functionalized ZIF-8 catalysts. • A plausible catalytic reaction mechanism was proposed. An acid-base bifunctional zeolitic imidazolate framework catalyst (ZIF8-A61-SO 3 H) with amine and sulfonic acid groups was successfully prepared through simple two step post-synthetic modification: preparation of amine-functionalized ZIF-8 with amine contents of 61% (ZIF8-A61) by the ligand exchange of 2-mIM with 3-amino-1,2,4-triazole (Atz), followed by the sulfonic acid functionalization by the ring-opening reaction of 1,3-propanesultone with –NH 2 groups in ZIF8-A61. Amine-functionalized ZIF8-A materials with difference amine contents (15%, 34%, and 61%, respectively) were also prepared by controlling the synthesis time. All obtained ZIF catalysts evaluated as a heterogeneous catalyst for one-pot deacetalization-Knoevenagel condensation tandem reaction. Compared with ZIF-8 and amine-functionalized ZIF-8 catalysts, ZIF8-A61-SO 3 H catalyst showed good catalytic performance with 100% conversion of the reactant and 98% selectivity of the final Knoevenagel product. An enhanced catalytic activity can be attributed to the co-existence of site-isolated acid-base groups on the ZIF8-A61-SO 3 H catalyst in close proximity. The heterogeneous nature of the catalytic system was confirmed by a hot-filtering test and the catalyst also exhibited reusable in the five repeated cycles. A plausible catalytic mechanism of deacetalization-Knoevenagel condensation reaction over ZIF8-A61-SO 3 H was also proposed. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.cattod.2019.06.076
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        Text: English
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        PageCount: 9
        StartPage: 124
    Subjects:
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Base catalysts
        Type: general
      – SubjectFull: Heterogeneous catalysts
        Type: general
      – SubjectFull: Ring-opening reactions
        Type: general
      – SubjectFull: Condensation reactions
        Type: general
      – SubjectFull: Catalytic activity
        Type: general
      – SubjectFull: Electrocatalysts
        Type: general
    Titles:
      – TitleFull: Dual-functionalized ZIF-8 as an efficient acid-base bifunctional catalyst for the one-pot tandem reaction.
        Type: main
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            NameFull: Lee, Yu-Ri
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            NameFull: Do, Xuan Huy
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            NameFull: Hwang, Seung Sang
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            NameFull: Baek, Kyung-Youl
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              Text: Jan2021
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              Y: 2021
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              Value: 359
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            – TitleFull: Catalysis Today
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