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  • Immobilisation of a molecular epoxidation catalyst on UiO-66 and -67: the effect of pore size on catalyst activity and recycling.

Immobilisation of a molecular epoxidation catalyst on UiO-66 and -67: the effect of pore size on catalyst activity and recycling.

Dalton transactions (Cambridge, England : 2003) (2015-08-19)
Marlene Kaposi, Mirza Cokoja, Christine H Hutterer, Simone A Hauser, Tobias Kaposi, Florian Klappenberger, Alexander Pöthig, Johannes V Barth, Wolfgang A Herrmann, Fritz E Kühn
ABSTRACT

Amino-functionalised metal-organic frameworks UiO-66 and -67 were post-synthetically modified with salicylaldehyde. A molybdenum complex was immobilised on the resulting materials. They were characterised by (13)C-MAS-NMR, XPS and PXRD to confirm immobilisation and stability. The immobilised complex is an active and reusable catalyst for olefin epoxidation with tert-butyl hydroperoxide (TBHP) as an oxidant. It is shown that the effective pore size, probed with Brunauer-Emmett-Teller (BET) surface area analysis and the number of amino groups affect the diffusion of reactants and products, as well as catalyst recycling.

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