Dehydrogenation coupling of methane(DCM),which can be effectively used to produce low carbon alkenes,has the advantages of rich raw materials,simple reaction device,low energy consumption,etc.Herein,we report a series of Co doped perovskite porous-dense BaCe0.9Y0.1CoxO3-δ(BCYCx)membrane for DCM.After treatment in a reduced atmosphere,a large number of Co nanoparticles will exsolute on the surface of BCY.The metal-oxide interface is helpful to activate the C-H bonds,inhibit the carbon deposition,and so on.The XRD,SEM and XPS prove that Co nanoparticles homogeneously distributed on the BCYCx porous layers,which will create a large quantity of catalytic active sites.At 1100℃,the highest concentration of C2 product was 5.66％(5.25％ethane+0.41％ethylene)in output gas when methane conversion reaches a maximum value of 24.8％,and the C2 selectivity gets to 45.6％.We further demonstrate the catalytic performance of high-temperature DCM without obvious decrease after running for 30 hours.