Preparation of nano-sized Al2O3–2SiO2 powder by sol–gel plus azeotropic distillation method--颗粒学报PARTICUOLOGY

Zheng, G., Cui, X., Zhang, W., Tong, Z., & Li, F. (2012). Preparation of nano-sized Al2O3–2SiO2 powder by sol–gel plus azeotropic distillation method. Particuology, 10(1), 42–45. https://doi.org/10.1016/j.partic.2011.07.007

Preparation of nano-sized Al₂O₃–2SiO₂ powder by sol–gel plus azeotropic distillation method

Guangjian Zheng ^{a b}, Xuemin Cui ^a, Weipeng Zhang ^a, Zhangfa Tong ^a *, Feng Li ^b

a Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
b State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

10.1016/j.partic.2011.07.007

Volume 10, Issue 1, February 2012, Pages 42-45

Received 11 May 2011, Revised 12 July 2011, Accepted 18 July 2011, Available online 24 January 2012.

E-mail: zhftong@sina.com

Highlights

► Nano-sized Al₂O₃–2SiO₂ powder was prepared by a sol–gel method with azeotropic distillation.

► The azeotropic distillation could effectively prevent formation of hard agglomerates.

► The synthetic powder possesses high alkali-activation reactivity.

Abstract

Nano-sized amorphous Al₂O₃–2SiO₂powder was prepared by a sol–gel method coupled with azeotropic distillation. The structure of the powder was investigated by DTS, BET, TEM, FT-IR, TG-DTA and XRD, showing that n-butanol azeotropic distillation could effectively remove water from the aluminosilicate gels and prevent the formation of hard agglomerates in the drying process. The average particle diameter of the powder was about 70 nm. The largest BET specific surface area of the powder was 669 m²/g. To examine the alkali-activation reactivity of the powder, alkali-activation tests were performed with the powder reacting with sodium silicate solution. The synthetic powder was found to be highly reactive.

Graphical abstract

Keywords

Geopolymer; Nano-sized powder; Sol–gel; Azeotropic distillation

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