Author(s)

Zhongshan Zhao ¹, Yue Sun ¹, Tao Cai ¹

Affiliation(s)

¹ College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, China

Corresponding Author

Yue Sun

ABSTRACT

This study focuses on the encapsulation of palladium-based nanocatalysts within Silicalite-1 zeolite through in-situ synthesis, with an aim to enhance the selective hydrogenation of nitroaromatic compounds. By controlling the size of palladium metal nanoclusters to approximately 1nm and incorporating hydrophobic organic groups into the zeolite framework, we significantly improved the hydrogenation efficiency. The modification with hydrophobic groups, specifically methyl groups, not only augmented the hydrophobicity of the zeolite but also its catalytic performance, especially for Pd@S-1-CH₃, in the hydrogenation of nitrobenzene, surpassing that of Pd@S-1. This modification was instrumental in achieving enhanced performance due to the improved mass transfer of reactants within the zeolite pores. The catalytic activity and stability of the modified catalysts were thoroughly investigated, with Pd@S-1-CH₃ demonstrating considerable activity and selectivity across various nitrobenzene derivatives. Notably, after 10 reaction cycles, the catalyst maintained high conversion rates and selectivity for 4-fluoronitrobenzene, underlining its robustness. This research provides valuable insights into the design of highly efficient and stable nanocatalysts for the selective hydrogenation of nitroaromatic compounds, offering a promising approach for the synthesis of aromatic amines, crucial intermediates in the chemical industry.

KEYWORDS

Zeolite; Metal nanocatalysts; Limiting effect; Selective hydrogenation; Aromatic amine

CITE THIS PAPER

Zhongshan Zhao, Yue Sun, Tao Cai, Metal nanocatalysts confined within hydrophobic zeolite for selective hydrogenation of nitroaromatics. Analytical Chemistry: A Journal (2024) Vol. 3: 20-25. DOI: http://dx.doi.org/10.23977/analc.2024.030104.

REFERENCES

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[2] J. Zhang, L. Wang, Y. Shao, Y. Wang, B.C. Gates, F.S. Xiao, A Pd@Zeolite Catalyst for Nitroarene Hydrogenation with High Product Selectivity by Sterically Controlled Adsorption in the Zeolite Micropores, Angewandte Chemie International Edition, 56 (2017) 9747-9751.
[3] J. Tang, P. Liu, X. Liu, L. Chen, H. Wen, Y. Zhou, J. Wang, In Situ Encapsulation of Pt Nanoparticles within Pure Silica TON Zeolites for Space-Confined Selective Hydrogenation, ACS Applied Materials & Interfaces, 12 (2020) 11522-11532.
[4] Y. Zhang, A. Li, M. Sajad, K. Fulajtárová, M. Mazur, M. Kubů, M. Shamzhy, M. Hronec, R. Bulánek, J. Čejka, Imidazolium-type ionic liquid-assisted formation of the MFI zeolite loaded with metal nanoparticles for hydrogenation reactions, Chemical Engineering Journal, 412 (2021) 128599.
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