In-situ prepared co exsolution nano catalyst for efficient hydrogen generation via ammonia decomposition

• Published in: Solid state ionics 2024-11, Vol.416, p.116679, Article 116679
• Main Authors: Jeong, Hyeongwon, Kim, Yo Han, Jang, Wonjun, Ji, Yunseong, Hong, Jong-Eun, Myung, Jae-ha
• Format: Article
• Language: English
• Subjects: Ammonia; Catalyst; Exsolution; Hydrogen; Nano particle
• ISSN: 0167-2738
• DOI: 10.1016/j.ssi.2024.116679

Active and durable catalytic material for ammonia (NH3) decomposition reaction is attracting attentions for utilization of NH3 as an innovative hydrogen carrier. In this study, diverse single metal and alloy nano catalysts are prepared via in-situ exsolution method and their NH3 decomposition properties are evaluated. Transition metal cations (Ni, Co, Fe ions) are doped into the La0.43Ca0.37MxNyTi1-(x+y)O3-δ (LCMNT) perovskite oxide structure and exsolved on its surface as supported nano particles under reduction condition. The maximum doping level and chemical composition of exsolution catalysts are investigated to optimize their NH3 decomposition activity. The exsolution catalyst demonstrates improved NH3 decomposition characteristics compared to conventionally prepared infiltration catalysts, indicating higher conversion efficiency and H2 production rate. The exsolved nano catalysts also exhibit great thermochemical stability against catalyst agglomeration or surface nitriding. The results obtained in this study suggest the potential utilization of exsolution catalysts for on-site production of H2 through NH3 decomposition catalysis. [Display omitted] •Single and alloy nano exsolution catalysts are prepared on a perovskite oxide with optimized Ni, Co, and Fe doping level.•The exsolution catalysts exhibited much higher NH3 conversion ratio compared to Ni infiltration catalyst.•Co exsolution catalyst showed the highest NH3 conversion ratio and H2 production rate than other exsolution catalysts.