STUDY ON REHYDROGENATION OF THE DECOMPOSED NaAlH4

Acta Metall Sin

2007, Vol. 42

Issue (1): 96-98 DOI:

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STUDY ON REHYDROGENATION OF THE DECOMPOSED NaAlH4

SUN Dalin;;;;

复旦大学

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SUN Dalin. STUDY ON REHYDROGENATION OF THE DECOMPOSED NaAlH4. Acta Metall Sin, 2007, 42(1): 96-98 .

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Abstract In-situ X-ray diffraction showed that Ti catalyst can reduce not only the dehydrogenation temperature of NaAlH4, but also that of Na3AlH6 from 250 ℃ to 160 ℃. The rehydrogenation of the decomposed NaAlH4 is reversible theoretically, but the intermediate hydride, Na3AlH6, is not fully converted into NaAlH4 because of the physical separation of NaH and Al formed in the decomposition, especially the formation of the large Al crystallites. These, therefore, result in a decrease in the hydrogen storage capacity as observed in the following cycling. Additional measurements have showed that those Al crystallites larger than 2.3 µm are no longer effective for rehydrogenatrion.

Key words: Hydrogen storage material NaAlH4 Rehydrogenation

Received: 24 May 2006

ZTFLH:

TG139.7

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V42/I1/96

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