4.6 Article

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

期刊

MOLECULES
卷 26, 期 20, 页码 -

出版社

MDPI
DOI: 10.3390/molecules26206191

关键词

layered double hydroxides; cerium; mechanochemical; co-precipitation; cyclohexanone self-condensation; Claisen-Schmidt condensation; chalcone; flavone

资金

  1. grant of the Romanian Minister of Research and Innovation, CCCDI-UEFISCDI within PNCDI III program [PN-III-P1-1.2-PCCDI-2017-0387/80PCCDI]

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This study compares two synthesis methods for obtaining cerium-doped layered double hydroxide and analyzes the impact of the preparation method on the physico-chemical properties. The mechanochemical route was found to have clear advantages in terms of both catalytic activity of the solids and cost efficiency.
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, Mg3Al0.75Ce0.25(OH)(8)(CO3)(0.5)& BULL;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.

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