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Thermal behavior of LDH 2CuAl.CO3 and 2CuAl.CO3/Pd

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Abstract

Cu/Al layered double hydroxide (LDH) can be used as a catalyst for important processes such as cross-coupling reactions. This property may be improved by adding palladium by either impregnation or intercalation. Therefore, the LDH matrix and its composites with Pd0 or [PdCl4]2− have been prepared. By powder X-ray diffraction, FT-infrared spectroscopy, thermogravimetric and elemental analysis it was determined the LDH formula Cu4Al2(OH)12CO3.4H2O, with malachite as the second phase. The LDH thermal decomposition occurs between 120 and 600 °C, having as intermediates the double oxi-hydroxide and the mixed oxide phases. At 800 °C the residue is composed of CuO and CuAl2O4. The composites were obtained employing [PdCl4]2− and Pd2(dba)3 as precursors, and the solvent choice for this process was shown to be of significant importance: the materials obtained using DMF had Pd impregnated in the surface, while the usage of water promoted the intercalation of [PdCl4]2− in the LDH matrix. The thermogravimetric analysis was able to distinguish the mode of supporting palladium between the composites being a reliable characterization for such task.

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Acknowledgements

This research was supported by CNPq, FAPERJ and CAPES.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro, 21941-909, Brazil

    V. A. Neves, M. V. Costa, L. C. S. Aguiar & L. F. B. Malta

  2. Instituto de Química, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, 20550-900, Brazil

    J. D. Senra

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  1. V. A. Neves
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  2. M. V. Costa
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  3. J. D. Senra
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  4. L. C. S. Aguiar
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  5. L. F. B. Malta
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Correspondence to L. F. B. Malta.

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Neves, V.A., Costa, M.V., Senra, J.D. et al. Thermal behavior of LDH 2CuAl.CO3 and 2CuAl.CO3/Pd. J Therm Anal Calorim 130, 689–694 (2017). https://doi.org/10.1007/s10973-017-6411-4

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  • DOI: https://doi.org/10.1007/s10973-017-6411-4

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