Layered double alkoxides a novel group of layered double hydroxides without water content

• Main Authors: Gábor Varga, Márton Szabados, Ákos Kukovecz, Zoltán Kónya, Tamás Varga, Pál Sipos, István Pálinkó
• Format: Article
• Language: English
• Published: Taylor & Francis Group 2020-02-01
• Series: Materials Research Letters
• Subjects: water-free ldh; colloidal phase co-precipitation; alkoxide–solvolysis; solid base catalyst
• Online Access: http://dx.doi.org/10.1080/21663831.2019.1700199

It has been generally accepted for long that water molecules are integral parts of layered double hydroxides (LDHs). It is even thought that in the absence of water molecules, there is no LDH structure. It is shown in this contribution that via the solvolysis of Mg- or Ca-alkoxides and Al-alkoxide with methanol or propanol and co-precipitated in methanolic methoxide, water-free LDH-like structures could be constructed. These novel LDH-like materials proved to be more active and selective catalysts in a Knoevenagel condensation than the corresponding ‘classical’ LDHs.