X-ray absorption study of Ti-activated sodium aluminum hydride

By J. Graetz, J. Reilly, J. Johnson, A. Ignatov, T. Tyson. 2004

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Ti K-edge x-ray absorption near-edge spectroscopy was used to explore the Ti valence and coordination in Ti-activated sodium alanate. An empirical relationship was established between the Ti valence and the Ti K-edge onset based on a set of standards. This relationship was used to estimate oxidation states of the titanium catalyst in 2 and 4mol% Ti-doped NaAlH4. The results demonstrate that the formal titanium valence is zero in doped sodium alanate and nearly invariant during hydrogen cycling. A qualitative comparison of the edge fine structure suggests that the Ti is present on the surface in the form of amorphous TiAl3.

Subfields: Catalysis, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/39ad34c764a6c22339a23bc41f54d8b517a48538