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The Influence of the Preparation Method on the Physico-Chemical Properties and Catalytic Activities of Ce-Modified LDH Structures Used as Catalysts in Condensation Reactions
| Content Provider | MDPI |
|---|---|
| Author | Rodica, Zăvoianu Ioana, Brezeștean Stamate, Alexandra-Elisabeta Pavel, Octavian Dumitru Birjega, Ruxandra Matei, Andreea Dumitru, Marius Osiac, Mariana Marcu, Ioan-Cezar |
| Copyright Year | 2021 |
| Description | Mechanical activation and mechanochemical reactions are the subjects of mechanochemistry, a special branch of chemistry studied intensively since the 19th century. Herein, we comparably describe two synthesis methods used to obtain the following layered double hydroxide doped with cerium, $Mg_{3}Al_{0.75}Ce_{0.25}(OH)_{8}(CO_{3})_{0.5}·2H_{2}$O: the mechanochemical route and the co-precipitation method, respectively. The influence of the preparation method on the physico-chemical properties as determined by multiple techniques such as XRD, SEM, EDS, XPS, DRIFT, RAMAN, DR-UV-VIS, basicity, acidity, real/bulk densities, and BET measurements was also analyzed. The obtained samples, abbreviated HTCe-PP (prepared by co-precipitation) and HTCe-MC (prepared by mechanochemical method), and their corresponding mixed oxides, Ce-PP (resulting from HTCe-PP) and Ce-MC (resulting from HTCe-MC), were used as base catalysts in the self-condensation reaction of cyclohexanone and two Claisen–Schmidt condensations, which involve the reaction between an aromatic aldehyde and a ketone, at different molar ratios to synthesize compounds with significant biologic activity from the flavonoid family, namely chalcone (1,3-diphenyl-2-propen-1-one) and flavone (2-phenyl-4H-1benzoxiran-4-one). The mechanochemical route was shown to have indisputable advantages over the co-precipitation method for both the catalytic activity of the solids and the costs. |
| Starting Page | 6191 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules26206191 |
| Journal | Molecules |
| Issue Number | 20 |
| Volume Number | 26 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-14 |
| Access Restriction | Open |
| Subject Keyword | Molecules Applied Chemistry Layered Double Hydroxides Cerium Mechanochemical Co-precipitation Cyclohexanone Self-condensation Claisen–schmidt Condensation Chalcone Flavone |
| Content Type | Text |
| Resource Type | Article |
