Crystallinity after decarboxylation of a metal-carboxylate framework : indestructible porosity for catalysis
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 11902-11910 |
Journal / Publication | Dalton Transactions |
Volume | 49 |
Issue number | 34 |
Online published | 24 Jul 2020 |
Publication status | Published - 14 Sep 2020 |
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Abstract
We report a curious case study of a Zr(IV)-carboxylate framework, which retains significant crystalline order after cascade thermocyclization of its linker components, and - more notably - after the crucial carboxylate links were severed by heat. Vigorous heat treatment (e.g., 450 °C and above) benzannulates the multiple alkyne groups on the linker to generate linked nanographene blocks and to afford real stability. The resultant Zr oxide/nanographene hybrid solid is stable in saturated NaOH and concentrated H3PO4, allowing a convenient anchoring of H3PO4 into its porous matrix to enable size-selective heterogeneous acid catalysis. The Zr oxide components can also be removed by strong hydrofluoric acid to further enhance the surface area (up to 650 m2 g-1), without collapsing the nanographene scaffold. The crystallinity order and the extensive thermal transformations were characterized by X-ray diffraction, scanning transmission electron microscopy (STEM), IR, solid state NMR and other instrumental methods.
Citation Format(s)
Crystallinity after decarboxylation of a metal-carboxylate framework : indestructible porosity for catalysis. / Cheng, Shengxian; Tieu, Peter; Gao, Wenpei; Hu, Jieying; Feng, Weijin; He, Jun; Pan, Xiaoqing; Xu, Zhengtao.
In: Dalton Transactions, Vol. 49, No. 34, 14.09.2020, p. 11902-11910.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review