Gibbsite to boehmite transformation in strongly caustic and nitrate environments

Xiaoyi Gong, Zimin Nie, Maoxu Qian, Jun Liu, Larry A. Pederson, David T. Hobbs, Norton G. McDuffie

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    Abstract

    The transformation of gibbsite to boehmite in strongly caustic solutions was studied using quantitative X-ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy techniques. Under hydrothermal conditions, we identified two transformation mechanisms: (1) dehydration and in situ nucleation and (2) dissolution and nucleation. If the reaction container was not completely sealed, dehydration of gibbsite followed by in situ nucleation of boehmite was the preferred mechanism. Boehmite produced fibrous boehmite particles within the amorphous matrix of the decomposed gibbsite particles, which exhibited a poorly crystalline structure and a smaller size than the initial gibbsite particles. In a closed environment, the preferred mechanism was the dissolution of gibbsite along (001) planes. The final boehmite particles were not morphologically related to the initial gibbsite particles and could be many times larger than the gibbsite particles.

    Original languageEnglish
    Pages (from-to)2163-2170
    Number of pages8
    JournalIndustrial and Engineering Chemistry Research
    Volume42
    Issue number10
    DOIs
    Publication statusPublished - 14 May 2003

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    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering

    Cite this

    Gong, X., Nie, Z., Qian, M., Liu, J., Pederson, L. A., Hobbs, D. T., & McDuffie, N. G. (2003). Gibbsite to boehmite transformation in strongly caustic and nitrate environments. Industrial and Engineering Chemistry Research, 42(10), 2163-2170. https://doi.org/10.1021/ie020837y