Ni metal supported on a perovskite-type oxide (Ca(0.8)Sr(0.2)Ti(1-x)FexO(3-alpha)) has been developed as a high-performance anode catalyst of an electrochemical membrane reactor for CH, conversion into synthesis gas. Synthesis gas production has been accelerated by electrochemical oxygen pumping, and selectivity to CD at 900 degreesC was almost 100%. The Ni/Ca0.8Sr0.2Ti0.9Fe0.1O3-alpha catalyst exhibits excellent stability for carbon deposition under the CH4 conversion compared with that over Ni/Al2O3 as a typical catalyst for CII, conversion. This is attributed to the oxidation of carbon deposits by the lattice oxygen species migrating to the Ni-Ca(0.8)Sr(0.2)Ti(0.9)Fe(0.1)O3-alpha boundary with mixed conduction in Ca0.8Sr0.2Ti0.9Fe0.1O3-alpha.