Non-oxidative dehydrogenation of hydrocarbons (NODHHCs) has drawn increasing interests in recent years due to its great potential to achieve high conversion rate, high selectivity, low energy consumption and low CO₂ emission. However, coking and thus degradation issues are currently hindering the commercial demonstration of the NODHHC technology. We here present a single-phase membrane reactor for NODHHC reaction for efficient and selective conversion of hydrocarbons. The membrane is consisted of a mixed electronic and protonic conductor, BaCo_0.4Fe_0.4Zr_0.1Y_0.1O₃ (BCFZY). The conversion study was carried out in a temperature range of 600-800^oC free of catalyst or electrical field. With ethane/steam as a feed gas, a single-pass ethane conversion rate of 70%, ethylene selectivity of 90% and ethylene yield of 67% has been demonstrated by the reactor from 650 to 750^oC with a steam/ethane ratio of 1.25. This performance is superior to the benchmark steam cracking technology. Long-term stability test has also shown that there is no significant degradation for more than 100 hours under the selected operating conditions.