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. |
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| 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] |
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| Database: | Engineering Source |
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