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Sci Technol Adv Mater. 2013 Aug 1;14(4):045007. eCollection 2013 Aug.

Preparation of a hierarchically porous AlPO4 monolith via an epoxide-mediated sol-gel process accompanied by phase separation.

Author information

1
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China; Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
2
Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
3
Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.

Abstract

Monolithic aluminum phosphate (AlPO4) with a macro-mesoporous structure has been successfully prepared via the sol-gel process accompanied by phase separation in the presence of poly(ethylene oxide) (PEO). Gelation of the system has been mediated by propylene oxide (PO), while PEO induces a phase separation. The dried gel is amorphous, whereas the crystalline tridymite phase precipitates upon heating above 1000 °C. Heat treatment does not spoil the macroporous morphology of the AlPO4 monoliths. Nitrogen adsorption-desorption measurements revealed that the skeletons of the dried gels possess a mesostructure with a median pore size of about 30 nm and a surface area as high as 120 m2 g-1. Hydrothermal treatment before heat treatment can increase the surface area to 282 m2 g-1.

KEYWORDS:

10.02; 20.03; 30.01; aluminum phosphate; monolith; phase separation; porous; sol–gel

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