Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (10): 20250138.doi: 10.7503/cjcu20250138

• Physical Chemistry • Previous Articles     Next Articles

Effects of Pd Electronic Density and Particle Size on the Low-temperature Hydrogenation Pathway of Furfural in Pd/Zr-MOFs Catalysts

WANG Chunhua1, HOU Haiyang1, LIU Yingya2(), DING Hai1(), LIU Tao1, HE Shuwen1   

  1. 1.School of Materials Science and Engineering,Henan Institute of Technology,Xinxiang 453003,China
    2.School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China
  • Received:2025-05-12 Online:2025-10-10 Published:2025-08-29
  • Contact: LIU Yingya, DING Hai E-mail:yingya.liu@dlut.edu.cn;dinghai8@163.com
  • Supported by:
    the National Natural Science Foundation of China(22271038);the Scientific and Technological Research Project in Henan Province, China(242102311241);the National University Student Innovation & Entrepreneurship Development Program of China

Abstract:

Pd/UiO-66, Pd/UiO-66-NH2 and Pd/UiO-67-bpydc catalysts were prepared by the impregnation method using a series of Zr-based MOFs materials with the same topological structure as supports. The primary focus was to investigate the influence of different nitrogen-containing ligands in the supports on the size of Pd particles, the electron density, and the hydrogenation pathway of furfural. The characterization results of X-ray photoelectron spectroscopy(XPS), carbon monoxide probe in situ Fourier transform infrared spectroscopy(CO-FTIR), and transmission electron microscope(TEM) indicate that there are interactions of varying strengths between different N-containing ligands and Pd particles, and this interaction not only regulates the size of Pd particles but also has a significant impact on the electron density of Pd. Catalytic reaction results show that different N-containing ligands result in significant differences in both the activity of the catalyst and the selectivity of the products. From the perspective of activity, an appropriate metal-support interaction between Pd and the different supports enhances the activity of the Pd/Zr-MOFs catalysts, while excessively strong interactions suppress catalytic activity. Regarding selectivity, the electron density of Pd is a key factor affecting the selectivity of the furfural hydrogenation pathway. Specifically, the amino nitrogen in UiO-66-NH2 and the bipyridine nitrogen in UiO-67-bpydc not only promote the dispersion of Pd particles, but also facilitate the electron transfer between UiO-66-NH2, UiO-67-bpydc and Pd particles. For the Pd/UiO-67-bpydc and Pd/UiO-66-NH2 catalysts with higher electron density, the furfural preferentially undergoes hydrogenation through the aldehyde group(C=O) in the side chain, for the Pd/UiO-66 catalyst with lower electron density, the furfural preferentially undergoes hydrogenation through the furan ring C=C double bond.

Key words: Pd/Zr-MOF catalyst, Furfural hydrogenation, Reaction pathway, Pd electron density

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