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- W1493222726 abstract "The handling of NaBH4 in a geopolymer type matrix is easy and can be done under open conditions. It is possible to store a high concentration of hydrogen, higher and easier compared to any related zeolite compound to which geopolymer gels could be seen as the mother compounds. From a systematic study of change in parameters, somehow optimized parameters for highest hydrogen release from NaBH4 geopolymer composite materials could be estimated: These are drying at 85 °C, a NaBH4/solid ratio of R = 0.75 and a molar Si/Al ratio of 2.6. A sample synthesized using these conditions releases 180 ml hydrogen per 100 mg. In comparison to the pure NaBH4 salt, it can be concluded that up to 80% hydrogen can be released by the reaction with diluted acid compared to pure NaBH4. An increase of more than 10% released hydrogen could be achieved with increasing the Si/Al ratio between 0.5 and 2.6. The new NaBH4-geopolymer composite may offer interesting properties as an alternative to the familiar use of alkaline solution containing 30 wt% NaBH4 in fuel cell applications. Further investigation may show if suitable technical solutions could be available for a direct application with the new composite. A more general question may also be related to overcome the difficulties concerning the NaBH4 itself." @default.
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- W1493222726 date "2014-12-19" @default.
- W1493222726 modified "2023-09-26" @default.
- W1493222726 title "NaBH <sub>4</sub> Geopolymer Composites" @default.
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- W1493222726 doi "https://doi.org/10.1002/9781119040293.ch1" @default.
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