Study of the catalytic activity of calcined hydrotalcites for Friedel–Crafts reactions

Study of the catalytic activity of calcined hydrotalcites for Friedel–Crafts reactions The structure of hydrotalcite (HT)-like compounds, also know as layered double hydroxides and anionic clays, can be described as containing brucite-like layers. In this study, we aim to compare the following different types of catalyst: NiMgAl-HT, CoMgAl-HT, NiMgLa-HT, and CoMgLa-HT. These samples were prepared by coprecipitation at constant basic pH (pH 11). The obtained solids were calcined at 450 °C. Hydrotalcite catalysts were characterized by atomic absorption spectroscopy (AAS), X-ray powder diffraction (XRD), Fourier-transform infrared (FTIR) analysis, and the Brunauer–Emmett–Teller (BET) method. The data obtained from chemical analysis of the calcined catalysts confirmed that the n (M2+/M3+) ratio is close to the intended value of 2. The XRD patterns confirmed the hydrotalcite structure. Room-temperature FTIR spectra were recorded in the range from 4,000 to 400 cm−1 on a PerkinElmer spectrometer. These catalysts were tested for the benzylation of by benzyl chloride reaction. Generally, the studies of activity showed that the catalytic performance varies as follows: NiMgAl-HT > CoMgAl-HT > NiMgLa-HT > CoMgLa-HT > MgAl-HT ≈ MgLa-HT. Research on Chemical Intermediates Springer Journals

Study of the catalytic activity of calcined hydrotalcites for Friedel–Crafts reactions

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Springer Netherlands
Copyright © 2013 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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