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Coprecipitation synthesis of Si-modified mesoporous alumina with high thermal stability from coal fly ash

Yusheng Wu, Laishi Li, and Xu Yang

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, China



Received: 31 October 2019  Accepted: 10 February 2020


Si-modified mesoporous alumina with high thermal stability was synthesized from coal fly ash through a facile coprecipitation method using NH4HCO3 and NH4Al(SO4)2. The effects of Si dopant contents on the characterization of alumina were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption method and transmission electron microscopy. The results show that the introduction of Si effectively inhibits the phase transformation of mesoporous alumina from γ-Al2O3 to α-Al2O3. Compared with alumina obtained without Si dopant, the specific surface area of mesoporous alumina with adding 12 wt% Si improved from 5.2 to 227.5% by increasing the calcination temperature from 500 to 1200 °C, respectively. The specific surface area, pore volume and pore size of mesoporous alumina with 12 wt% Si calcined at 1100 °C are 149 m2/g, 0.52 cm3/g and 8.9 nm, respectively.

Keywords: Mesoporous alumina; Si dopant; Coal fly ash; Thermal stability; AACH

Full paper is available at

DOI: 10.1007/s11696-020-01101-9


Chemical Papers 74 (8) 2537–2543 (2020)

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