South African Journal of Chemistry
versão On-line ISSN 1996-840X
RATHOD, Sandip; NAVGIRE, Madhukar; ARBAD, Balasaheb e LANDE, Machhindra. Preparation of Mg-doped Ce-Zr solid catalysts and their catalytic potency for the synthesis of 5-arylidene-2,4-thiazolidinediones via Knoevenagel condensation. S.Afr.j.chem. (Online) [online]. 2012, vol.65, pp. 196-201. ISSN 1996-840X.
A series of Mg-doped Ce-Zr mixed oxides with different molar ratios were prepared by a simple co-precipitation method. The surface characterization of these materials were investigated by means of XRD, FT-IR, SEM-EDS, CO2-TPD and BET techniques. The catalytic activity of the prepared materials was tested by synthesizing of 5-arylidene-2,4-thiazolidinedione derivatives via a Knoevenagel condensation using aromatic aldehydes and 2,4-thiazolidinedione in ethanol:water medium. The best catalytic activity was obtained with Ce1Mg0.6Zr0.4O2. The particle size or crystallite size was estimated using the Debye-Scherrer equation. Addition of MgO to the Ce-Zr mixed metal oxides affected both particle size and catalytic activity.
Palavras-chave : Mg-doped Ce-Zr oxide; surface characterization; co-precipitation; 5-arylidene-2; 4-thiazolidinedione.