Ni on alumina-coated cordierite monoliths for in situ generation of CO-free H2 from ammonia

We present here the testing results in NH3 decomposition of a catalytic structured reactor consisting of a cordierite monolith coated with a catalyst layer of well-dispersed Ni on mesoporous γ-alumina. The catalyst is low cost, stable and exhibits high activity, achieving complete conversion of pure NH3 at a temperature as low as 873 K. Notably, the conversion is significantly higher when the catalyst is in the form of monolith than in a packed bed of the same catalyst in the form of particles smaller than 200 μm, achieving total NH3 conversion at 100 K lower temperature. These results along with the process intensification derived from the use of monolithic catalyst make this catalyst a promising candidate for in situ H2 generation from ammonia to feed fuel cells in vehicles or industry.

Graphical abstractWe have prepared a low-cost-structured catalytic reactor very promising for in situ H2 generation from ammonia in portable devices. The monolithic catalyst shows high activity and stability, achieving a 100% conversion of pure ammonia at 880 K, while the same catalyst in packed bed achieves 100% conversion at 980 K.Figure optionsDownload full-size imageDownload high-quality image (89 K)Download as PowerPoint slide