HZSM-5 zeolites with different SiO₂/Al₂O₃ ratios are employed as supports of Fe catalysts for NH₃ decomposition. The structural and surface properties of the prepared Fe/ZSM-5 catalysts are characterized by solid-state NMR, XRD, N₂ sorption, TEM, H₂-TPR, NH₃-TPD and XPS techniques, giving an insight into the active sites responsible for NH₃ decomposition reaction. It is revealed that the catalytic activities of Fe/ZSM-5 catalysts are correlated with the SiO₂/Al₂O₃ ratios of ZSM-5 support. And the SiO₂/Al₂O₃ ratio of ZSM-5 zeolites could significantly affect the acidity, NH₃ adsorption-desorption processes, metal-support interactions, and Fe particles size and distributions of Fe/ZSM-5 catalysts, and thus, affecting their catalytic performance. The Fe/ZSM-5 catalysts with low SiO₂/Al₂O₃ ratio exhibit high catalytic performance. Almost 99% NH₃ decomposition could be achieved over the 5%Fe/ZSM-5 catalyst with SiO₂/Al₂O₃ ratio of 28 at 650 °C at a high space velocity of 30,000 cm³ h⁻¹ g_cat⁻¹, suggesting a very promising catalyst in NH₃ decomposition.

使用具有不同SiO ₂ / Al ₂ O ₃比的HZSM-5沸石作为Fe催化剂用于NH ₃分解的载体。通过固态NMR，XRD，N ₂吸附，TEM，H ₂ -TPR，NH ₃ -TPD和XPS技术表征了制备的Fe / ZSM-5催化剂的结构和表面性质，从而深入了解了活性位点负责NH ₃分解反应。结果表明，Fe / ZSM-5催化剂的催化活性与ZSM-5载体的SiO ₂ / Al ₂ O ₃比有关。和SiO ₂ / Al ₂ZSM-5沸石的O ₃比会显着影响酸度，NH ₃吸附-解吸过程，金属-载体相互作用以及Fe / ZSM-5催化剂的Fe粒径和分布，从而影响其催化性能。具有低SiO ₂ / Al ₂ O ₃比的Fe / ZSM-5催化剂表现出高催化性能。在5％的Fe / ZSM-5催化剂上，SiO ₂ / Al ₂ O ₃比为28，在650°C下以30,000 cm ³  h ^-1  g _cat ^-1的高空速可以实现将近99％的NH ₃分解。，表明在NH ₃分解中非常有希望的催化剂。