Reinforcement of fluidized catalysts with DBD plasma assisted for green ammonia synthesis

Abstract

The conventional ammonia production process using the Haber-Bosch (H-B) method is highly efficient but necessitates severe reaction conditions with a large energy consumption. Meanwhile, a significant CO2 emission are generated due to the acquisition of H2. This study proposed a system combined the non-thermal plasma and fluidized catalysts with the water vapor as the green feedstock for high-efficiency ammonia synthesis. Results reveal that bimetallic Co-Ni supported catalysts on the MgO carrier exhibit notably higher NH3 formation rates than single-component metal-supported catalysts and no catalysts. The highest NH3 formation rate, achieved with a 4 wt% catalysts loading, reached 12.07 μmol g−1h−1 (specific energy input of 2.15 kJ L−1, energy efficiency of 6.57 mg kW−1h−1). A synergistic effect between the fluidized catalysts and the plasma was observed. It greatly improves ammonia yield and provides a new platform for sustainable ammonia synthesis.