Nickel–Palladium Bimetallic Nanomaterials of Polyoxopalladates as Precursor Loaded on SBA15 for Enhanced Plasma‐Assisted Ammonia Synthesis

Abstract Bimetallic nanomaterials in conjunction with porous materials have emerged as the most promising catalytic materials for plasma‐assisted ammonia synthesis. Adopting appropriate synthesis strategies to regulate the morphology of porous materials and the bimetallic active components is a potential way to further enhance their catalytic performance. However, the role of the morphology and composition of the materials remains unclear. In this study, we synthesize composite catalysts (MnPd 12 /SBA15, CoPd 12 /SBA15, CuPd 12 /SBA15, and NiPd 12 /SBA15) by regulating the morphology of the support mesoporous silica (SBA15) and using polyoxopalladates, which can precisely control molecular structure, as a precursor for bimetallic nanomaterials. Then, the performances of these catalysts for plasma‐assisted ammonia synthesis are investigated. The results show that the NiPd 12 /SBA15 composite catalyst has the highest ammonia synthesis yield, with a sample of 85 mg achieving an ammonia concentration up to 9070 ppm, and the energy consumption is as low as 77.75 MJ/mol. Additionally, it demonstrates good stability in cyclic experiments. The synergistic effect of SBA15 and NiPd 12 enables the NiPd 12 /SBA15 catalyst to significantly enhance the yield of ammonia synthesis. It is due to the ability of NiPd 12 metals to stabilize the dissociation state of N 2 , while having a relatively weak affinity for NH x intermediates. This facilitates the desorption of NH 3 from the catalyst surface.