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Bifunctional metal–organic frameworks for the hydrogenation of nitrophenol using methanol as the hydrogen source

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Abstract

This work reports the reduction of 4-nitrophenol to 4-aminophenol using UiO-66(Zr) as a bifunctional photocatalyst and hydrogenation catalyst using methanol as the hydrogen source. In particular, a series of UiO-66(Zr)-X (X: NH2, NO2 and H) and MIL-125(Ti)-NH2 catalysts have been screened as bifunctional catalysts for this process. UiO-66(Zr)-NH2 was found to be the most active material to promote light-assisted nitro hydrogenation under both UV-Vis and simulated sunlight irradiation. The tandem reaction occurs via hydrogen generation from a water/methanol mixture in the first step and, then, reduction of 4-nitrophenol to 4-aminophenol. UiO-66(Zr)-NH2 acts as a truly heterogeneous catalyst and can be reused several times without significant loss of activity, maintaining its crystallinity. This work shows the possibility of using MOFs as solar-driven bifunctional catalysts to promote the hydrogenation of organic compounds using methanol as the hydrogen source.

Graphical abstract: Bifunctional metal–organic frameworks for the hydrogenation of nitrophenol using methanol as the hydrogen source

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Article information


Submitted
14 Aug 2020
Accepted
30 Sep 2020
First published
05 Oct 2020

Org. Biomol. Chem., 2020, Advance Article
Article type
Paper

Bifunctional metal–organic frameworks for the hydrogenation of nitrophenol using methanol as the hydrogen source

A. Melillo, C. García-Vallés, B. Ferrer, M. Álvaro, S. Navalón and H. García, Org. Biomol. Chem., 2020, Advance Article , DOI: 10.1039/D0OB01686A

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