A study of degradation phenomenon of Ni–Pt/CeO2 catalyst towards hydrogen generation from hydrous hydrazine. (29th June 2017) - Dai, Hao
Abstract: Catalytic decomposition of hydrous hydrazine (N2 H4 ·H2 O) has received considerable attention as a promising chemical hydrogen storage system. But the currently available N2 H4 ·H2 O decomposition catalysts always showed poor durability. In the present paper, we report an experimental study of the performance degradation of Ni–Pt/CeO2 catalyst using TPD-MS, FTIR, HRTEM techniques. Our study on the post-used Ni–Pt/CeO2 catalyst found that a predominant N2 species and various reaction intermediates over-strongly bound on the catalyst surface. Furthermore, the amount of the bound N2 species at Ni sites is approximately linearly correlated with the activity decay degree. These results provide a straightforward explanation of the performance degradation phenomenon and highlight the critical role of adsorbate/catalyst interaction in determination of the catalytic performance. Graphical abstract: The activity decay of Ni-Pt/CeO2 towards N2 H4 ·H2 O decomposition is due primarily to over-strongly bound N-contained species on the catalyst surface. Highlights: N2 H4 ·H2 O has received attention as a promising chemical H2 storage material. The property degradation of Ni–Pt/CeO2 catalyst was studied experimentally. The activity decay is due mainly to over-strongly bound N-contained species. This finding highlights the critical role of adsorbate/catalyst interaction.