Transesterification of vegetable oils on basic large mesoporous alumina supported alkaline fluorides-Evidences of the nature of the active site and catalytic performances

Marian Verziu, Mihaela Florea, Simion Simon, Viorica Simon, Petru Filip, Vasile I. Parvulescu, Christopher Hardacre

    Research output: Contribution to journalArticlepeer-review

    Abstract

    KF, LiF and CsF/Al2O3 catalysts with different loadings from 1 to 20 wt% were prepared using aqueous solutions of the alkaline fluoride compounds by wet impregnation of basic mesoporous MSU-type alumina. The catalysts were activated under Ar at 400 °C for 2 h and monitored by in situ XRD measurements. The catalysts were also characterized using several techniques: N2 adsorption/desorption isotherms at -196 °C, FTIR, DR-UV-vis, CO2-TPD, XRD, 27Al CP/MAS NMR. These characterizations led to the conclusion that the deposition of alkaline fluorides on the alumina surface generates fluoroaluminates and aluminate species. The process is definitivated at 400 °C. The fluorine in these structures is less basic than in the parent fluorides, but the oxygen becomes more basic. The catalysts were tested for the transesterification of fatty esters under different experimental conditions using conventional heating, microwave and ultrasound irradiation. Recycling experiments showed that these catalysts are stable for a limited number of cycles.

    Original languageEnglish
    Pages (from-to)56-66
    Number of pages11
    JournalJournal of Catalysis
    Volume263
    Issue number1
    DOIs
    Publication statusPublished - 1 Apr 2009

    Keywords

    • Conventional heating
    • CsF/AlO catalysts
    • KF
    • LiF
    • Microwave
    • Transesterification
    • Ultrasound irradiation
    • Vegetal fatty esters

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