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<p>The synthesis of γ–Al<sub>2</sub>O<sub>3</sub> using coal-bearing kaolinite as the aluminum source involves a multi-step process consisting of four main stages: (1) Preparation of metakaolinite, (2) Preparation of sodium aluminate solution, (3) Preparation of aluminum hydroxide, and (4) Preparation of γ-Al<sub>2</sub>O<sub>3</sub> through high-temperature heat treatment. To thoroughly characterize the prepared γ-Al<sub>2</sub>O<sub>3</sub>, various analytical techniques were employed, including x-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller (BET) surface area measurements and pore size distributions. The results of the characterization studies revealed that the synthesized γ-Al<sub>2</sub>O<sub>3</sub> exhibits several notable features. The material is lightweight, has a non-crystalline structure, and appears as white porous solids. The primary particle size of the γ-Al<sub>2</sub>O<sub>3</sub> is generally &lt; 50&#xa0;nm, and these nanoparticles form a three-dimensional network structure, leading to a highly porous material. The BET surface area of the γ-Al<sub>2</sub>O<sub>3</sub> was determined to be 248.92 m<sup>2</sup>/g, indicating a high specific surface area that can provide ample active sites for catalytic reactions. Furthermore, the pore size distribution, as determined by the Barrett–Joyner–Halenda method, revealed that the diameters of the pores inside the particles primarily range from 2 to 10&#xa0;nm, confirming its mesoporous nature. These unique properties make the prepared γ-Al<sub>2</sub>O<sub>3</sub> a promising material for various applications in catalysis and other fields where a large surface area and controlled pore size are crucial for optimizing the performance of the material.</p>

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Preparation and Characterization of γ-Al2O3 from Coal-Bearing Kaolinite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月3日

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  • Wenzhe Gu,
  • Zhicheng Liu,
  • Mengye Zhao,
  • Zhiwei He,
  • Ziwei Ding

摘要

The synthesis of γ–Al2O3 using coal-bearing kaolinite as the aluminum source involves a multi-step process consisting of four main stages: (1) Preparation of metakaolinite, (2) Preparation of sodium aluminate solution, (3) Preparation of aluminum hydroxide, and (4) Preparation of γ-Al2O3 through high-temperature heat treatment. To thoroughly characterize the prepared γ-Al2O3, various analytical techniques were employed, including x-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller (BET) surface area measurements and pore size distributions. The results of the characterization studies revealed that the synthesized γ-Al2O3 exhibits several notable features. The material is lightweight, has a non-crystalline structure, and appears as white porous solids. The primary particle size of the γ-Al2O3 is generally < 50 nm, and these nanoparticles form a three-dimensional network structure, leading to a highly porous material. The BET surface area of the γ-Al2O3 was determined to be 248.92 m2/g, indicating a high specific surface area that can provide ample active sites for catalytic reactions. Furthermore, the pore size distribution, as determined by the Barrett–Joyner–Halenda method, revealed that the diameters of the pores inside the particles primarily range from 2 to 10 nm, confirming its mesoporous nature. These unique properties make the prepared γ-Al2O3 a promising material for various applications in catalysis and other fields where a large surface area and controlled pore size are crucial for optimizing the performance of the material.