Abstract Ru-Cs(Ba)/Sibunit catalysts with the molar ratio Cs(Ba):Ru = 2.5 were synthesized using the carbon composite Sibunit calcined at 1400, 1600, 1800, 2000 and 2200 °C. Activity of the promoted catalysts in ammonia synthesis and their thermal stability to methanation were compared. Substantial changes in the structure and properties of Sibunit during its calcination were shown to affect the activity of the synthesized catalysts. As the calcination temperature was raised, specific surface (Ssp) decreased considerably, the carbon structure became ordered, whereas the specific activity (Wsp) increased. Thus, Wsp at 400 °C for Cs-Ru/Sib1400 was equal to 0.107 mol NH3·gRu−1·h−1, while for Cs-Ru/Sib2200 — 0.591 mol NH3·gRu−1·h−1. It was found that elevation of the calcination temperature and introduction of barium significantly enhanced thermal stability of the samples — the carbon loss decreased up to 10 times.

中文翻译：

---

高温处理对Ru-Cs(Ba)/Sibunit催化剂合成氨活性及耐甲烷化性能的影响

摘要 使用在 1400、1600、1800、2000 和 2200 °C 下煅烧的碳复合材料 Sibunit 合成了摩尔比 Cs(Ba):Ru = 2.5 的 Ru-Cs(Ba)/Sibunit 催化剂。比较了促进催化剂在氨合成中的活性及其对甲烷化的热稳定性。Sibunit 的结构和性质在其煅烧过程中的实质性变化会影响合成催化剂的活性。随着煅烧温度的升高，比表面积（Ssp）显着降低，碳结构变得有序，而比活性（Wsp）增加。因此，Cs-Ru/Sib1400 在 400 °C 下的 Wsp 等于 0.107 mol NH3·gRu-1·h-1，而对于 Cs-Ru/Sib2200 — 0.591 mol NH3·gRu-1·h-1。