Issue 27, 2014

Peculiar behavior of MWW materials in aldol condensation of furfural and acetone

Abstract

MWW family of different structural types (MCM-22, MCM-49, MCM-56 and MCM-36) was used as catalysts for aldol condensation of furfural and acetone studied in a batch reactor at 100 °C, autogenous pressure and a reaction time of 0–4 h. To establish a relation between physico-chemical and catalytic properties of microporous materials, the samples were characterized by XRD, SEM, N2 adsorption, FTIR and TGA. It was found that the acidic solids possessed appreciable activity in the reaction and resulted in the formation of products of aldehyde–ketone interaction. Surprisingly, MCM-22 and MCM-49, i.e. three-dimensional materials containing internal supercages, exhibited higher activity than two MCM-36 catalysts with two-dimensional character having larger accessible external surface area due to expansion of the interlayer space by swelling and pillaring treatments. Moreover, all MWW family catalysts gave higher conversion than the large-pore zeolite BEA. Nevertheless, furfural conversion decreased rapidly for all the studied materials due to coke formation. Unexpectedly, the deactivation was found to be more severe for MCM-36 catalysts than for MCM-22 and MCM-49, which was attributed to the reaction taking place also in supercages that are protected by 10-ring channels from severe coking. In contrast the cups located on the external surface were coked rapidly.

Graphical abstract: Peculiar behavior of MWW materials in aldol condensation of furfural and acetone

Article information

Article type
Paper
Submitted
19 yan 2014
Accepted
23 apr 2014
First published
24 apr 2014

Dalton Trans., 2014,43, 10628-10641

Peculiar behavior of MWW materials in aldol condensation of furfural and acetone

O. Kikhtyanin, P. Chlubná, T. Jindrová and D. Kubička, Dalton Trans., 2014, 43, 10628 DOI: 10.1039/C4DT00184B

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