Metal–support interactions on Ru/CaAlOx catalysts derived from structural reconstruction of Ca–Al layered double hydroxides for ammonia decomposition

Abstract

Strong metal–support interaction (SMSI) over Ru/CaAlO_x was constructed by utilizing the surface structural reconstruction of Ca–Al layered double hydroxides (LDHs) in aqueous solution and their subsequent hydroxide-to-oxide transformations. Ru nanoparticles were found to uniformly embed with CaAlO_x. The electronic interactions and changes in CO adsorption behavior confirmed the SMSI state between Ru and CaAlO_x. Owing to SMSI, the as-prepared Ru/CaAlO_x showed improved catalytic activity in the decomposition of ammonia, especially at a relatively low temperature.