Chemically stable TMOx@Ti-MgO (TM = Mn and Cu) catalyst enhanced De/hydrogenation kinetics of Mg/MgH2

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2025-04-19 DOI:10.1016/j.jma.2025.02.032

Haotian Guan, Jiang Liu, Qian Li, Yangfan Lu, Fusheng Pan

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Abstract

Ti-based catalysts have been identified to be efficient in enhancing hydrogenation and dehydrogenation (de/hydrogenation) kinetics of Mg/MgH₂. However, their catalytic activity is constrained by the strong Ti‒H bond and chemical instability. Herein, we demonstrate that TMO_x@Ti-MgO (TM = Mn and Cu) composite catalysts can simultaneously enhance hydrogen dissociation, diffusion and nucleation processes. MgH₂ catalyzed by TMO_x@Ti-MgO released 6.03−6.14 wt. % H₂ within 5 min at 280 °C and 0.89−1.12 wt. % H₂ within 60 min at 180 °C. The partially oxidized Ti²⁺ and Ti³⁺ states are stabilized in MgO lattice, accelerating hydrogen adsorption, dissociation and diffusion processes. The TMO_x, additionally, serve as the active center for nucleation, further improving de/hydrogenation reactions. The TMO_x@Ti-MgO catalysts are characterized by high chemical stability, realizing improved cycle properties. These findings suggest a new approach to achieving controllable Catalyst-Hydrogen bond strengths and optimizing performance in de/hydrogenation reactions.

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化学稳定性TMOx@Ti-MgO （TM = Mn和Cu）催化剂增强了Mg/MgH2的脱氢动力学

钛基催化剂可以有效地提高Mg/MgH2的加氢和脱氢动力学。然而，它们的催化活性受到强Ti-H键和化学不稳定性的限制。在此，我们证明TMOx@Ti-MgO （TM = Mn和Cu）复合催化剂可以同时促进氢的解离、扩散和成核过程。TMOx@Ti-MgO催化的MgH2在280℃下5 min内释放出6.03 ~ 6.14 wt. %的H2，在180℃下60 min内释放出0.89 ~ 1.12 wt. %的H2。部分氧化的Ti2+和Ti3+态在MgO晶格中被稳定，加速了氢的吸附、解离和扩散过程。此外，TMOx作为成核的活性中心，进一步改善了脱/氢化反应。TMOx@Ti-MgO催化剂具有较高的化学稳定性，实现了较好的循环性能。这些发现为实现可控催化剂-氢键强度和优化脱氢反应性能提供了新的途径。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.