A study of degradation phenomenon of Ni–Pt/CeO2 catalyst towards hydrogen generation from hydrous hydrazine. (29th June 2017)

• Record Type: Journal Article
• Authors: Dai, Hao; Qiu, Yu-Ping; Dai, Hong-Bin; Wang, Ping
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 26(2017)
• Page Start: 16355
• Page End: 16361
• Publication Date: 2017-06-29
• Subjects: Hydrogen storage -- Catalyst -- Performance degradation -- Binding of intermediate; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.05.086
• Languages: English
• ISSNs: 0360-3199

Abstract

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.