Gibbsite to Boehmite Transformation in Strongly Caustic and Nitrate Environments

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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; dehydration and in-situ nucleation and 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 smaller size than the initial gibbsite particles. In a closed environment, the preferred mechanism was the dissolution ... continued below

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Hobbs, D.T. November 26, 2002.

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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; dehydration and in-situ nucleation and 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 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.

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  • Journal Name: Industrial and Engineering Chemistry Research

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  • Report No.: WSRC-MS-2002-00850
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 805315
  • Archival Resource Key: ark:/67531/metadc740265

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  • November 26, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • May 5, 2016, 1:57 p.m.

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Hobbs, D.T. Gibbsite to Boehmite Transformation in Strongly Caustic and Nitrate Environments, article, November 26, 2002; South Carolina. (digital.library.unt.edu/ark:/67531/metadc740265/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.