Defect‐Engineered Ni‐MOF‐74 Catalyst for Boosting the Dielectric Barrier Discharge Plasma‐Assisted Ammonia Synthesis

ABSTRACT Designing of defective catalysts for plasma‐catalytic ammonia synthesis presents significant importance and challenges. In present work, the original ligand 2,5‐dihydroxyterephthalic acid was partially replaced by the defect ligand 2‐hydroxynicotinic acid to prepare defective Ni‐MOF‐74 catalysts with different doping ratio. The effects of defective Ni‐MOF‐74 catalysts on pulsed‐plasma ammonia synthesis were investigated. The results indicated that Ni‐MOF‐74 (5:5) exhibited the best plasma‐catalytic synergistic efficiency. The ammonia synthesis rate for defective Ni‐MOF‐74 catalyst can up to 36.52 mmol g −1 h −1 , with a nitrogen conversion rate of 1.36% and an energy yield of 2.88 g kWh −1 . Compared to plasma‐only situation, the ammonia synthesis rate, nitrogen conversion rate and the energy yield increased by 21.61 times, 4.38 times, and 4.36 times, respectively.