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HomeKey Engineering MaterialsKey Engineering Materials Vol. 768Preparation of Macroprous C12A7 Mayenite Monoliths...

Preparation of Macroprous C12A7 Mayenite Monoliths via a Sol-Gel Process with Nitrates as Precursors

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Abstract:

Macroporous Ca₁₂Al₁₄O₃₃ (C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al₂O₃ binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca₁₂Al₁₄O₃₃ mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.

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Periodical:

Key Engineering Materials (Volume 768)

Pages:

211-217

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.768.211

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Online since:

April 2018

Authors:

Rui Wang, Yu Kun Sun, Bao Jia Qi Jiang, Hui Yang, Xing Zhong Guo*

Keywords:

C12A7, Phase Seperation, Porous Monoliths, Sol-Gel Reaction

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* - Corresponding Author

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