Catalytic decomposition of NH₃ to high purity hydrogen offers a promising strategy for fuel cells, but presents challenges for high hydrogen yields at comparatively low temperatures due to the lack of efficient catalysts. Here, we report the facile preparation of ultra-fine ruthenium (Ru) species dispersed on MgO, which show excellent activity and high temperature stability for NH₃ decomposition reaction. The hydrogen yield of the prepared Ru/MgO catalysts reaches ca. 2,092 mmol H₂ g_Ru⁻¹ min⁻¹ at 450 °C, far exceeding that of the previously reported most reactive Ru-based catalysts and the same chemical composition samples prepared by other approaches. Various characterization techniques containing X-ray absorption fine structure (XAFS), in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRTFTS) and temperature-programmed reduction/desorption (TPR/TPD) were carried out to explore the structure-function relation of the prepared Ru/MgO catalysts. We found that the Ru species interact strongly with the MgO support, which can efficiently protect the Ru species and MgO support from agglomerating during NH₃ decomposition test, maintaining the stability of the catalysts.

中文翻译：

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使用促进的MgO负载钌催化剂催化NH 3催化分解制氢

NH ₃催化分解为高纯度氢为燃料电池提供了一种有希望的策略，但由于缺乏有效的催化剂，因此在相对较低的温度下高氢产率面临挑战。在这里，我们报道了分散在MgO上的超细钌（Ru）物质的简便制备方法，该物质对NH ₃分解反应显示出优异的活性和高温稳定性。所制备的Ru / MgO催化剂的氢产率达到约2。2,092 mmol H ₂ g_钌^-1 min ^-1在450°C的温度下，远远超过先前报道的大多数反应性Ru基催化剂和通过其他方法制备的相同化学成分样品。进行了各种表征技术，包括X射线吸收精细结构（XAFS），原位漫反射红外傅里叶变换光谱法（原位DRTFTS）和程序升温还原/解吸（TPR / TPD），以探索结构功能制备的Ru / MgO催化剂的关系 我们发现，Ru物种与MgO载体强烈相互作用，可以有效保护Ru物种和MgO载体在NH ₃分解试验期间不发生团聚，从而保持催化剂的稳定性。