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

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-08-31 DOI:10.1016/j.ssi.2024.116679

Hyeongwon Jeong , Yo Han Kim , Wonjun Jang , Yunseong Ji , Jong-Eun Hong , Jae-ha Myung

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Abstract

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 La_0.43Ca_0.37M_xN_yTi_1-(x+y)O_3-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.

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原位制备的通过氨分解高效制氢的共溶剂纳米催化剂

用于氨（NH3）分解反应的活性和耐久性催化材料在利用 NH3 作为创新氢载体方面备受关注。本研究通过原位外溶解法制备了多种单一金属和合金纳米催化剂，并对其 NH3 分解性能进行了评估。过渡金属阳离子（镍、钴、铁离子）被掺杂到 La0.43Ca0.37MxNyTi1-(x+y)O3-δ （LCMNT）包晶氧化物结构中，并在还原条件下以支撑纳米颗粒的形式溶解在其表面。研究了外溶催化剂的最大掺杂水平和化学成分，以优化其 NH3 分解活性。与传统制备的浸润催化剂相比，外溶解催化剂具有更好的 NH3 分解特性，表明其具有更高的转化效率和 H2 产率。此外，外溶解纳米催化剂还具有很高的热化学稳定性，可防止催化剂团聚或表面氮化。本研究获得的结果表明，通过 NH3 分解催化，外溶解催化剂具有现场生产 H2 的潜力。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.