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. 2018 Jul 12;9(33):6844-6852.
doi: 10.1039/c8sc02115e. eCollection 2018 Sep 7.

Glass Wool: A Novel Support for Heterogeneous Catalysis

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Free PMC article

Glass Wool: A Novel Support for Heterogeneous Catalysis

Ayda Elhage et al. Chem Sci. .
Free PMC article

Abstract

Heterogeneous catalysis presents significant advantages over homogeneous catalysis such as ease of separation and reuse of the catalyst. Here we show that a very inexpensive, manageable and widely available material - glass wool - can act as a catalyst support for a number of different reactions. Different metal and metal oxide nanoparticles, based on Pd, Co, Cu, Au and Ru, were deposited on glass wool and used as heterogeneous catalysts for a variety of thermal and photochemical organic reactions including reductive de-halogenation of aryl halides, reduction of nitrobenzene, Csp3-Csp3 couplings, N-C heterocycloadditions (click chemistry) and Csp-Csp2 couplings (Sonogashira couplings). The use of glass wool as a catalyst support for important organic reactions, particularly C-C couplings, opens the opportunity to develop economical heterogeneous catalysts with excellent potential for flow photo-chemistry application.

Figures

Fig. 1
Fig. 1. Picture showing the reaction setup used under LED irradiation and continuous stirring (left), and the easy removal of the GW material from the reaction vessel utilizing a pair of tweezers (right).
Fig. 2
Fig. 2. Pictures of different materials used in this work: (a) pristine SGW, (b) pristine NGW, (c) HCl-treated SGW, d) APTES-functionalized NGW (NGW*), (e) Pd@SGW, (f) Cu@NGW, (g) Co@SGW, (h) Ru@NGW* and (i) Au@NGW*.
Fig. 3
Fig. 3. SEM images (top) and EDS spectra (bottom) in the marked areas of untreated SGW (a–c) and of Co@SGW (d and e). Notice that the particulates on the SGW fiber are mostly composed of NaCl. Agglomerated particles were not considered to determine particle size distribution.
Fig. 4
Fig. 4. Left: diffuse reflectance spectrum of HCl-treated SGW (black) and Co@SGW (blue). Right: deconvoluted Co 2p HR-XPS spectrum of the Co@SGW catalyst.
Scheme 1
Scheme 1. Scope of reactions tested with the modified glass wool composites. Only the reactions that were successfully catalyzed are listed here.

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