Immobilizing Ni (II)-Exchanged Heteropolyacids on Silica as Catalysts for Acid-Catalyzed Esterification Reactions

Authors

  • Qiuyun Zhang
    Affiliation

    School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, Guizhou Province, China; Engineering Technology Center of Control and Remediation of Soil Contamination of Provincial Science & Technology Bureau, Anshun University, Anshun 561000, Guizhou Province, China

  • Dandan Lei
    Affiliation

    School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, Guizhou Province, China

  • Qianqian Luo
    Affiliation

    School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, Guizhou Province, China

  • Taoli Deng
    Affiliation

    School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, Guizhou Province, China

  • Jingsong Cheng
    Affiliation

    School of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, Guizhou Province, China

  • Yutao Zhang
    Affiliation

    Engineering Technology Center of Control and Remediation of Soil Contamination of Provincial Science & Technology Bureau, Anshun University, Anshun 561000, Guizhou Province, China

  • Peihua Ma
    Affiliation

    School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou Province, China

https://doi.org/10.3311/PPch.14788

Abstract

Biodiesel was synthesized from oleic acid using Ni (II)-exchanged heteropolyacids immobilized on silica (Ni0.5H3SiW / SiO2 ) as a solid acid catalyst. Based on detailed analyses of FT-IR, XRD, TG and SEM, the structural, surface and thermal stability of Ni0.5H3SiW / SiO2 were investigated. Obtained results demonstrated that the Keggin structure was well in the immobilization process and possess a high thermal stability. Various esterification reaction conditions and reusability of catalyst were studied. High oleic acid conversion of 81.4 % was observed at a 1:22 mole ratio (oleic acid: methanol), 3 wt. % catalyst at 70 °C for 4 h. The Ni0.5H3SiW / SiO2 catalyst was reused for several times and presented relatively stable. More interestingly, the kinetic studies revealed the esterification process was compatible with the first order model, and a lower activation energy was obtained in this catalytic system.

Keywords:

heteropolyacids, Ni salts of silicotungstic acid, SiO2, esterification, biodiesel

Published Online

2019-11-28

How to Cite

Zhang, Q., Lei, D., Luo, Q., Deng, T., Cheng, J., Zhang, Y., Ma, P. “Immobilizing Ni (II)-Exchanged Heteropolyacids on Silica as Catalysts for Acid-Catalyzed Esterification Reactions”, Periodica Polytechnica Chemical Engineering, 65(1), pp. 21–27, 2021. https://doi.org/10.3311/PPch.14788

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Articles