Cl-free Ru/CeO₂ spherical catalysts were prepared by incipient wetness impregnation and subsequent washing processes using RuCl₃·3H₂O and a commercial spherical CeO₂ support. Cs addition improved the catalytic performance for NH₃ decomposition, and the optimal Cs loading was a Cs/Ru molar ratio of 0.43. Transmission electron microscopy (TEM) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX) suggested that Cs was present around Ru metal particles and served as an anchor for forming small, well-dispersed Ru metal particles (∼2 nm). CO₂ temperature-programmed desorption results indicated that the Cs-Ru/CeO₂ catalyst had more strong basic sites than the Ru/CeO₂ catalyst. Kinetic analysis results clearly demonstrated that Cs addition promoted recombinative desorption of N atoms, which is the rate-determining step of NH₃ decomposition. Consequently, the Cs-Ru/CeO₂ spherical catalyst (Cs/Ru = 0.43) treated in Ar for 1 h at 773 K exhibited high catalytic activity for NH₃ decomposition (NH₃ conversion: 40% at 523 K and 80% at 573 K) at 2000 mL-NH₃ g cat^–1 h^–1.

中文翻译：

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NH ₃低温分解浸渍和洗涤工艺制备的Cs-Ru / CeO ₂球形催化剂的表征和动力学分析

通过初湿浸渍和随后的洗涤过程，使用RuCl ₃ ·3H ₂ O和商业球形CeO ₂载体，制备了无Cl Ru / CeO ₂球形催化剂。Cs的添加改善了NH ₃分解的催化性能，并且最佳的Cs负载量为0.43的Cs / Ru摩尔比。透射电子显微镜（TEM）和扫描电子显微镜以及能量色散X射线光谱（SEM–EDX）表明，铯存在于Ru金属粒子周围，并作为形成细小，分散良好的Ru金属粒子的锚点（〜2 nm）。CO _2程序升温程序解吸结果表明，Cs-Ru / CeO ₂催化剂具有比Ru / CeO ₂催化剂更强的碱性位点。动力学分析结果清楚地表明，Cs的添加促进了N原子的重组解吸，这是NH ₃分解的速率决定步骤。因此，在773 K下在Ar中处理1 h的Cs-Ru / CeO ₂球形催化剂（Cs / Ru = 0.43）对NH ₃分解显示出高催化活性（NH ₃转化率：523 K为40％，573为80％）。 K）在2000 mL-NH ₃ g cat ^–1 h ^–1。