Effect of Y2o3 Morphologies on the Catalytic Performance of Ni/Y2o3 Catalysts for Ammonia Decomposition

The catalytic performance is highly related to the catalyst structure. Herein, a series of Ni nanoparticles supported on Y 2 O 3 with different morphologies were successfully synthesized by hydrothermal method with the precursor solutions under different pH environments. These Ni/Y 2 O 3 catalysts were applied to efficiently produce CO x -free H 2 through ammonia decomposition. Y 2 O 3 supports would affect the metal particle sizes and its dispersion degree on the Y 2 O 3 . The experimental results show that Ni/Y11 catalyst achieves 100% ammonia decomposition conversion under a GHSV of 12,000 mL∙h -1 ∙g cat -1 and temperature of 650 ºC. Such a high level of activity over Ni/Y11 catalyst was attributed to a large specific surface area, appropriate alkalinity, and small Ni nanoparticles diameter with high dispersion