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<p>Coal Gasification Crude Slurry (CGCS) is rich in silicon and aluminum elements and possesses a natural porous structure, making it a promising candidate for developing a large-scale, low-cost, and highly efficient inorganic silicon source. Due to its complex composition and irregular morphology, regulating its pore structure is essential to expand its applications. Using three cationic quaternary ammonium salt templates-cetyltrimethylammonium bromide (CTAB), 1 hexadecyl 3 methylimidazolium bromide ([C<sub>16</sub>MIm]Br<sub>3</sub>), and octadecyltrimethylammonium bromide (OTAB) the microstructure of mesoporous SiO<sub>2</sub> based on CGCS was effectively controlled under conditions of pH = 1, surfactant concentration 3 × 10<sup>–5</sup> mol L<sup>−1</sup>, CGCS liquid-to-solid ratio 8:1, and aging at 90°C. SEM and TEM analyses revealed dendritic, layered, and cauliflower-like microstructures. XRD and FTIR analyses confirmed an amorphous microstructure. BET and BJH analyses indicated a two-dimensional pore network with pore sizes of 4.04–4.63 nm and specific surface areas of 656–818 m<sup>2</sup> g<sup>−1</sup>. The template agent promoted the rearrangement of silicate units [SiO<sub>4</sub>]<sup>4−</sup> and [Si<sub>2</sub>O<sub>7</sub>]<sup>6−</sup>, preserving lattice integrity while enhancing structural order and porosity. In this study, the preparation process is simple and inexpensive, and the cationic templates can be used to extract mesoporous SiO<sub>2</sub> with different surface morphology from CGCS, which has a good application prospect as an inorganic silicon source.</p>

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Preparation of Coal Gasification Coarse Slag-Based Mesoporous Silica and Regulation of Microscopic Morphology

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Xuxu Fu,
  • Yanhua Teng,
  • Xinyu Fang,
  • Changguo Xue,
  • Jinjie Song,
  • Yuhang Guo,
  • Hanxu Li

摘要

Coal Gasification Crude Slurry (CGCS) is rich in silicon and aluminum elements and possesses a natural porous structure, making it a promising candidate for developing a large-scale, low-cost, and highly efficient inorganic silicon source. Due to its complex composition and irregular morphology, regulating its pore structure is essential to expand its applications. Using three cationic quaternary ammonium salt templates-cetyltrimethylammonium bromide (CTAB), 1 hexadecyl 3 methylimidazolium bromide ([C16MIm]Br3), and octadecyltrimethylammonium bromide (OTAB) the microstructure of mesoporous SiO2 based on CGCS was effectively controlled under conditions of pH = 1, surfactant concentration 3 × 10–5 mol L−1, CGCS liquid-to-solid ratio 8:1, and aging at 90°C. SEM and TEM analyses revealed dendritic, layered, and cauliflower-like microstructures. XRD and FTIR analyses confirmed an amorphous microstructure. BET and BJH analyses indicated a two-dimensional pore network with pore sizes of 4.04–4.63 nm and specific surface areas of 656–818 m2 g−1. The template agent promoted the rearrangement of silicate units [SiO4]4− and [Si2O7]6−, preserving lattice integrity while enhancing structural order and porosity. In this study, the preparation process is simple and inexpensive, and the cationic templates can be used to extract mesoporous SiO2 with different surface morphology from CGCS, which has a good application prospect as an inorganic silicon source.