Ammonia is a prospective hydrogen transport intermediate due to its high volumetric and gravimetric H₂ densities, and existing production and distribution infrastructure. However, its ultimate use in mobile proton exchange membrane (PEM) fuel cells necessitates decomposition and purification at or near the point of use. In this study, the production of high purity H₂ from NH₃ using a two-stage process has been demonstrated by coupling separate decomposition (150 g of 1 wt % Ru on Al₂O₃ catalyst) and purification (a single 150 cm², Pd-coated tubular vanadium membrane) stages. Equilibrium NH₃ decomposition and >90% H₂ recovery was demonstrated with a catalyst temperature of 450 °C and membrane temperature of 340 °C, with an overall H₂ production rate of 0.75 kg/day. Mass spectrometry showed that levels of N₂ and NH₃ impurities were below detection limits. This configuration is readily scalable by increasing the catalyst loading and membrane area (through use of multiple tubes in parallel), and could enable a pathway for distributed use of H₂ from NH₃ in mobile and stationary power generation.

中文翻译：

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通过钌基分解催化剂和钒基膜从NH ₃产生高纯H ₂

由于其高的体积和重量H ₂密度以及现有的生产和分配基础设施，氨是一种潜在的氢传输中间体。但是，其在移动质子交换膜（PEM）燃料电池中的最终用途需要在使用时或在使用点附近进行分解和纯化。在这项研究中，通过分步分解（150 g 1重量％Ru在Al ₂ O ₃催化剂上）和纯化（单个150 cm ²）耦合，证明了采用两步法从NH _3中生产高纯度H _2的方法。，镀钯的管状钒膜）级。平衡NH ₃分解和> 90％H ₂催化剂温度为450°C，膜温度为340°C，H ₂的总生产速率为0.75 kg / day，表明回收率高。质谱表明，N ₂和NH ₃杂质含量低于检测极限。通过增加催化剂载量和膜面积（通过并联使用多个管），可以轻松扩展此配置，并且可以在移动和固定式发电中实现从NH ₃到H _2的分布式使用的途径。