Abstract An original way to perform the exsolution of Ni nanoparticles on a ceramic support was explored for the development of methane steam reforming catalyst in SOFC anode conditions. The n=2 Ruddlesden‐Popper (RP) phase La 1.5 Sr 1.5 Mn 1.5 Ni 0.5 O 7±δ has been synthesized by the Pechini method and subsequently reduced with an H 2 ‐N 2 mixture at different temperatures and reducing times to induce the formation of two phases: LaSrMnO 4 (n=1 RP) decorated with metallic Ni nanoparticles. Preliminary measurements of catalytic behavior for the steam reforming have been carried out in a reduction‐reaction process with a mixture of 82 mol %CH 4 , 18 mol %N 2 and low steam to carbon ratio (S/C=0.15). The catalyst exhibits a selectivity for CO production (0.97), 14.60 mol % CH 4 conversion and around 24.19 mol % H 2 production. Such catalytic behavior was maintained for more than 4 h, with a constant rate of hydrogen production and CH 4 conversion rate.