K-nRu-MCM-41, a potassium (K)-promoted Ru-based siliceous molecular sieve catalyst, was effectively produced using a hydrothermal technique. The combined examination of XRD, FT-IR, and XPS data demonstrated that Ru occurs as RuO2 species in the framework of the molecular sieves, causing structural changes. SEM and TEM images revealed that Ru doping alters the morphology of the molecular sieves, but K addition efficiently retains the original morphology and improves particle dispersion. According to the ammonia decomposition performance test, K increases the activity of the molecular sieve catalysts. At 450°C and 12,000 mL·gcat-1·h-1, K-4Ru-MCM-41 converted ammonia at 82.7%, demonstrating a 7.6% increase over 4Ru-MCM-41. Furthermore, the K-4Ru-MCM-41 catalyst was extremely reusable, retaining its constant catalytic activity performance after 30 hours.

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