Abstract
Ammonia (NH3) is a promising carbon-free fuel for industrial applications and potential energy storage medium for hydrogen storage. Plasma-catalytic NH3 synthesis offers a green alternative to traditional methods. This study investigates the role of Ru-Co-based catalysts in enhancing NH3 synthesis performance, focusing on optimizing energy efficiency and synthesis rates through support selection and reaction condition adjustments. Results demonstrated that the catalytic performance follows the trend Ru-Co/AC > Ru-Co/TiO2 > Ru-Co/ZSM-5 > Ru-Co/SiO2, with Ru-Co/AC achieving the highest energy efficiency (3.21 g-NH3·kWh-1) and synthesis rate (7547 μmol·g-1·h-1). Catalyst characterizations, including ICP-OES, HR-TEM, XRD, N2 adsorption–desorption, XPS, EPR, H2-TPR, and CO2-TPD, revealed that support characteristics, such as surface area, pore structure, metal dispersion, and surface alkalinity, significantly affect the plasma-catalytic performance. Optical emission spectroscopy (OES) was used to monitor plasma-generated radicals, providing insights into the reaction mechanism. The superior plasma-catalytic performance over Ru-Co/AC is attributed to its abundant surface oxygen vacancies and strong alkalinity. A proposed mechanism explains the role of these support properties in optimizing NH3 synthesis.
Published Version
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