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Issue 28, 2020
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Calcium and nitrogen species loaded into SBA-15 – a promising catalyst tested in Knoevenagel condensation

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Abstract

Mesoporous silica of the SBA-15 type was used as a support for basic active centers generated by the incorporation of calcium species and (3-aminopropylo)trimethoxysilane (APTMS) or imidazole. The samples were characterized by low temperature N2 adsorption/desorption, XRD, XPS, FTIR spectroscopy, CO2-TPD, and elemental and thermal analyses. Calcium containing samples were analysed in 2,5-hexanedione dehydration and cyclization, while the activities of all the samples were examined in Knoevenagel condensation between benzaldehyde and malononitrile. It was demonstrated that the calcium species interacted with a silica support increasing the stabilization of organosilanes on the SBA-15 surface. A very high activity of the catalysts in Knoevenagel condensation indicated a synergistic interaction between calcium and the organic modifiers.

Graphical abstract: Calcium and nitrogen species loaded into SBA-15 – a promising catalyst tested in Knoevenagel condensation

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Supplementary files

Article information


Submitted
04 May 2020
Accepted
23 Jun 2020
First published
06 Jul 2020

Dalton Trans., 2020,49, 9781-9794
Article type
Paper

Calcium and nitrogen species loaded into SBA-15 – a promising catalyst tested in Knoevenagel condensation

D. Kryszak, K. Stawicka and M. Trejda, Dalton Trans., 2020, 49, 9781 DOI: 10.1039/D0DT01621G

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