Preparation of KCa2Nb3O10-based porous hybrid with Ru for H-2 generation catalyst by NH3 decomposition

Layered calcium niobate perovskite with partial substitution of Nb by Ru was prepared for the catalyst of H-2 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 H-2 generation measurements, different roles of the intralayer and interlayer Ru were considered as follows. The interlayer Ru lowers the starting temperature of the H-2 generation, whereas the intralayer Ru increase the H-2 generation rate. (C) 2020 The Ceramic Society of Japan. All rights reserved.