Abstract A series of ruthenium catalysts using β-SiC as a support was synthesized with different metal loading (1−5 wt.% of Ru). Catalysts were characterized and tested with hydrogen production by catalytic ammonia decomposition. Additionally, the influence of calcination conditions as well as reduction temperatures (673 K and 873 K) was studied. Ru dispersion and metallic particle size were found to greatly influence catalytic activity. Moreover, calcination in a nitrogen atmosphere could remove a higher proportion of chlorine species derived from the precursor, thereby enhancing catalytic activity. Furthermore, a lower reduction temperature resulted in smaller particle sizes of ruthenium, which were more active in ammonia decomposition. Maximum intrinsic activity was obtained for a Ru size of around 5 nm. The catalyst containing 2.5 wt.% Ru, calcined in a N2 atmosphere and reduced at 673 K resulted in excellent H2 production from ammonia decomposition, with ammonia conversion close to 100% at 623 K was obtained. Porous SiC proved to be a suitable support for the nanosized Ru catalyst and was highly active in hydrogen production from ammonia decomposition. Moreover, this support provided good performance stability after one day of reaction.

中文翻译：

---

碳化硅催化剂负载钌氨分解制氢

摘要 以β-SiC 为载体合成了一系列不同金属负载量（1-5 wt.% Ru）的钌催化剂。用催化氨分解制氢对催化剂进行表征和测试。此外，还研究了煅烧条件和还原温度（673 K 和 873 K）的影响。发现 Ru 分散度和金属粒度对催化活性有很大影响。此外，在氮气氛中煅烧可以去除更高比例的源自前体的氯物质，从而提高催化活性。此外，较低的还原温度导致较小的钌颗粒尺寸，其在氨分解中更活跃。对于大约 5 nm 的 Ru 尺寸，获得了最大的内在活性。含有 2.5 wt.% Ru 的催化剂，在 N2 气氛中煅烧并在 673 K 下还原导致氨分解产生极好的 H2，在 623 K 下获得接近 100% 的氨转化率。多孔 SiC 被证明是纳米级 Ru 催化剂的合适载体，并且在氨分解制氢中具有高度活性。此外，该载体在反应一天后提供了良好的性能稳定性。