Facile synthesis of mesoporous Si-containing γ-Al₂O₃ nanofiber with enhanced thermal stability

Abstract

Mesoporous γ-Al₂O₃ nanofiber was prepared via a simple reverse precipitation route using Si-containing Al(OH)₃ and HNO₃ as raw materials. The resultant Si-containing mesoporous γ-Al₂O₃ nanofiber exhibited high surface area of 320 m²/g, large pore volume of 1.17 cm³/g and large pore size of 10.5 nm. The introduction of Si element remarkably enhanced the thermal stability of mesoporous γ-Al₂O₃. The as-prepared nanofiber could maintain relative high surface area(110 m²/g) and pore volume(0.73 cm³/g) up to 1100 °C. The effects of various experimental conditions, such as pH value, reaction temperature and aging temperature on the structural properties of the mesoporous γ-Al₂O₃ were also investigated.

Keywords

Mesoporous γ-Al₂O₃ / Reverse precipitation / Thermal stability / Nanofiber

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