Phosphotungstic Acid Supported on Magnetic Mesoporous Tantalum Pentoxide Microspheres: Efficient Heterogeneous Catalysts for Acetalization of Benzaldehyde with Ethylene Glycol

  • Caiting Feng
  • Qinlong Li
  • Panfeng Wu
  • Bin Liu
  • Huaiming Hu
  • Ganglin XueEmail author


In this study, magnetically-recoverable core–shell catalysts with different amount of H3PW12O40 loading [Fe3O4@C@mTa2O5-NH2-PW12 (w%)] were prepared by the application of phosphotungstic acid supported on amino group functionalized magnetic core–shell mesoporous tantalum pentoxide microspheres. The prepared samples were characterized by FT-IR, N2-adsorption–desorption isotherms, TEM, SEM, Pyridine-IR analysis, XRD and magnetism. Fe3O4@C@mTa2O5-NH2-PW12 samples present both Brönsted and Lewis acidity, large BET surface area and high magnetization. The catalytic activity was evaluated by the acetalization of different aldehydes with diols, and the results show that Fe3O4@C@mTa2O5-NH2-PW12 (14.47%) catalyst exhibits the highest catalytic activity for acetalization of aldehydes with glycols with 94.5% conversion of benzaldehyde and 99% selectivity to benzaldehyde glycol acetal at 80 °C. The catalytic activity of the catalyst for acetalization is related to its total acidity and Brönsted–Lewis acid synergy. The catalyst Fe3O4@C@mTa2O5-NH2-PW12 can be easily recovered and reused for at least 5 times without obvious decrease of catalytic activity.

Graphic Abstract


Heteropoly acid Ta2O5 Recyclable catalysts Brönsted/Lewis acid Acetalization 



This work was supported by the National Natural Science Foundation of China (21673176).

Supplementary material

10562_2019_3029_MOESM1_ESM.pdf (486 kb)
Supplementary material 1 (PDF 486 kb)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Caiting Feng
    • 1
  • Qinlong Li
    • 1
  • Panfeng Wu
    • 1
  • Bin Liu
    • 1
  • Huaiming Hu
    • 1
  • Ganglin Xue
    • 1
    Email author
  1. 1.College of Chemistry & Materials ScienceNorthwest UniversityXi’anPeople’s Republic of China

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