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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

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

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Publisher
Springer Netherlands
Copyright
Copyright © 2013 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-013-1309-7
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jun 29, 2013

References

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