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Facile preparation of Mg-doped graphitic carbon nitride composites as a solid base catalyst for Knoevenagel condensations

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Abstract

Mg-doped graphitic carbon nitride (g-C3N4) composites were prepared using a facile thermal polymerization process under air atmosphere. The obtained materials can be employed as the solid base catalysts in Knoevenagel condensation reactions. The Mg-doped g-C3N4 composites show excellent performance as a solid catalyst and superior catalytic activity compared to the pure CN-U. The introduction of Mg species improved the overall basic property of CN-U, favoring Knoevenagel condensations. The 5MgCN-U catalyst exhibited high benzaldehyde conversion of 97.4% at 70 °C and good cycling stability for four cycles, with 87.7% benzaldehyde conversion and nearly 100% benzylidene malononitrile selectivity. Additionally, the Mg-doped g-C3N4 composites from urea showed superior catalytic performance than those produced from dicyandiamide and melamine, indicating that the precursors contribute to the efficiency of Knoevenagel condensation reactions.

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Acknowledgements

This work was supported by the program for Yong Teachers Scientific Research in Qiqihar University (No. 2014k-Z10).

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  1. College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China

    Qingfang Deng & Qingna Li

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  1. Qingfang Deng
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Correspondence to Qingfang Deng.

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Deng, Q., Li, Q. Facile preparation of Mg-doped graphitic carbon nitride composites as a solid base catalyst for Knoevenagel condensations. J Mater Sci 53, 506–515 (2018). https://doi.org/10.1007/s10853-017-1534-3

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  • DOI: https://doi.org/10.1007/s10853-017-1534-3

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