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Layered calcium niobate perovskite with partial substitution of Nb by Ru was prepared for the catalyst of H2 generation from NH3. The X-ray photoelectron spectroscopy confirmed that the substituted Ru exists at the intralayer position. The layered perovskite was exfoliated and re-aggregated with Ru and Na cation to increase the surface area to form a card house-type porous hybrid. The surface area apparently increased to around 12–18 times compared to the sample without exfoliation. The amount of interlayer Ru is much larger than that of the intralayer Ru from the X-ray fluorescence measurement. From the H2 generation measurements, different roles of the intralayer and interlayer Ru were considered as follows. The interlayer Ru lowers the starting temperature of the H2 generation, whereas the intralayer Ru increase the H2 generation rate.
Fukasawa et al. (Sat,) studied this question.
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