Abstract
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.
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This work was supported by the National Natural Science Foundation of China under Grant no. 51974188 and Liaoning BaiQianWan Talents Program.
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Wu, Y., Li, L. & Yang, X. Coprecipitation synthesis of Si-modified mesoporous alumina with high thermal stability from coal fly ash. Chem. Pap. 74, 2537–2543 (2020). https://doi.org/10.1007/s11696-020-01101-9
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DOI: https://doi.org/10.1007/s11696-020-01101-9