Impact of organic/inorganic alkalis in tailoring of Mg/Al-hydrotalcite used in Claisen–Schmidt condensation

Zăvoianu, Rodica; Taha, Salman Eman; Cojocaru, Bogdan E.; Pârvulescu, Vasile I.; Pavel, Octavian D.

doi:10.1016/j.cattod.2024.114693

Catalysis Today

2024

DOI: 10.1016/j.cattod.2024.114693

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Impact of organic/inorganic alkalis in tailoring of Mg/Al-hydrotalcite used in Claisen–Schmidt condensation

Rodica Zăvoianu,

Salman Eman Taha,

Bogdan E. Cojocaru

et al.

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2024

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Cited by 2 publications

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Mixed Oxides as Catalysts for the Condensation of Cyclohexanol and Benzaldehyde to Obtain a Claisen–Schmidt Condensation Product

Stoylkova,

Stanimirova,

Chanev

et al. 2024

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Acid–base M2+MgAlO and M2+AlO mixed oxides (where M2+ = Mg, Cu, Co, Zn, and Ni) were obtained by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors and used as catalysts for cyclohexanol and benzaldehyde condensation under solvent-free conditions. The catalysts were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and temperature-programmed desorption of CO2 (TPD-CO2). Gas chromatography–mass spectroscopy (GC/MS) was used for the identification and quantification of the product mixtures. In the reaction of cyclohexanol and benzaldehyde on M2+MgAlO and MgAlO catalysts, a 2,6-dibenzylidene-cyclohexanone was obtained as the main product as a result of consecutive one-pot dehydrogenation of cyclohexanol to cyclohexanone and subsequent Claisen–Schmidt condensation. In the reaction mixture obtained in the presence of NiAlO, CoAlO, and ZnAlO catalysts, a cyclohexyl ester of 6-hydroxyhexanoic acid was detected together with the main product. This is most likely a by-product obtained after the oxidation, ring opening, and subsequent esterification of the cyclohexanol.

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Mixed Oxides as Catalysts for the Condensation of Cyclohexanol and Benzaldehyde to Obtain a Claisen–Schmidt Condensation Product

Stoylkova,

Stanimirova,

Chanev

et al. 2024

Catalysts

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Layered Double Hydroxide-Based Composites for Concerted Decontamination of Water

Al Hasnawi,

Ion,

Tudorache

et al. 2024

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A series of composites was prepared starting from five types of LDHs, which were then exchanged with three types of metallo-phthalocyanines, and, in the end, magnetic nanoparticles were attached. In the case of LDHs containing Fe, characterization data showed that there was a partial oxidation from Fe2+ to Fe3+. Samples containing evident LDH structures performed better in general than the ones containing iron oxide mixtures, the composites being more active towards amoxicillin removal compared with ampicillin removal. The nature of the phthalocyanine did not have such a great influence, although some differences in the activity were observed. The removal was a combination between adsorption and photocatalytic degradation. The best composites for this application were those based on Mg0.325Fe0.325Al0.25-LDH prepared by co-precipitation in the presence of NaOH and Na2CO3. They presented high adsorption capacity in 10 min and, at the same time, high photocatalytic activity for both amoxicillin and ampicillin.

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Impact of organic/inorganic alkalis in tailoring of Mg/Al-hydrotalcite used in Claisen–Schmidt condensation

Cited by 2 publications

References 54 publications

Mixed Oxides as Catalysts for the Condensation of Cyclohexanol and Benzaldehyde to Obtain a Claisen–Schmidt Condensation Product

Mixed Oxides as Catalysts for the Condensation of Cyclohexanol and Benzaldehyde to Obtain a Claisen–Schmidt Condensation Product

Layered Double Hydroxide-Based Composites for Concerted Decontamination of Water

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