The strong N N bond, notoriously difficult to dissociate, has long posed a significant challenge to ammonia synthesis under mild conditions, typically requiring high temperatures and pressures. Here, Ru-supported Sr-based perovskite/CNT core/shell composites were developed as microwave-responsive catalysts for ammonia synthesis. Leveraging their exceptional microwave responsiveness, Ru/SrCeO 3 /CNT achieved an NH 3 production rate of 1.04 mmol·(g·h) −1 at 300 °C and 0.1 MPa, with no deactivation observed after 72 h. The energy consumption reached 0.10 MJ·(mol·g) −1 at 30 W much lower than the recent research on microwave ammonia synthesis. The core/shell architecture facilitated in-situ heat generation from the CNT core, enhancing interfacial reactions on Ru nanoparticles. Furthermore, XPS and H 2 -TPR analyses revealed that oxygen vacancies and strong interfacial interactions in the SrCeO 3 support boosted the electron-donating capacity of Ru active sites, promoting N N bond cleavage. This work offers a scalable, energy-efficient strategy for sustainable ammonia production.
A novel Silicon carbide (SiC) foam ceramic based ZSM-5/SiC nanowires microwave-responsive catalyst was developed to upgrade the pyrolysis volatiles in a microwave-assisted series system (both the pyrolysis and catalytic systems were heated by microwave). The growth of SiC nanowires was helpful for the ZSM-5 growth on the SiC foam ceramic. Because the specific surface area of SiC foam ceramic was improved. The dielectric properties of the composite catalyst were improved due to the growth of SiC nanowires. Bio-oil composition analysis showed that area percentage of hydrocarbons and aromatic hydrocarbons could reach 80.89% and 40.48% at catalytic temperature of 450 ℃and 500 ℃, respectively. The microwave-responsive composite catalyst had good aromatization performance in microwave-assisted series system due to high dielectric properties and specific surface area. The composite catalyst performed well after five-cycle regeneration, and the hydrocarbon content could still reach 76.40%, which is 80.89% for the original catalyst.
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