New electrochemical reactor has been developed,which makes it possible to oxidize particulate matter (PM) or solid carbon-based emission, and simultaneously to clean up nitrogen oxide (NOx), through the redox reactions in an electrochemical ceramic reactor. In contrast to the conventional PM filter system, the electrochemical ceramic reactor can decompose PM continuously by using active oxygen generated from a ceramic electrode mixed with calcium aluminate (Ca₁₂A₁₁₄O₃₃) without requiring regeneration. The new reactor is expected to serve as new technology for zero-emission exhaust gas cleanup in the treatment of diesel exhaust gas.