H2-Production on New BaTi(1−x)RhxO3 Catalyst via the Steam Reforming of CH4 for H2-SCR Applications

Abstract

Rh-doped perovskites BaTi0.9Rh0.1O3 and Rh–BaTiO3 were prepared by a new synthesis method and analyzed by XRD and FE-scanning electron microscopy (SEM). The effect of HCl for sol-formation was studied, HCl improves the sol formation but chlorine remains in the catalyst even after calcination treatment at 1,000 °C. Cl-free catalysts were prepared and analyzed on reactions for H2 production which can be used for H2-SCR reactions. The Rh-integrated perovskite BaTi0.9Rh0.1O3 displayed better catalytic performance compared to Rh–BaTiO3 and Rh–TiO2 under the studied reaction conditions. Carefull XRD analysis was carried out to demonstrate the incorporation of Rh in the perovskite lattice. Rhodium reacts with the tetragonal perovskite BaTiO3 to stabilize the hexagonal modification. Mainly, the hexagonal perovskite was found in the catalyst BaTi0.9Rh0.1O3. This modification appears only after Rh-impregnation and calcination of the tetragonal BaTiO3 thus coexisting the hexagonal perovskite BaTi(1−x)RhxO3 and the tetragonal BaTiO3. The catalysts reduction in diluted H2 containing gas mixtures cause the segregation of Rh° nanoparticles out of the perovskite crystal lattice.