水解
催化作用
合金
活化能
成核
三元运算
动力学
材料科学
相(物质)
水溶液
化学工程
化学
无机化学
物理化学
冶金
有机化学
量子力学
计算机科学
工程类
程序设计语言
物理
作者
Xianliu Xu,Yongzheng Hui,Yunfeng Zhao,Shuai Wang,Yanhao Wang,Baosheng Liu,Jifan Hu,Yanghuan Zhang
标识
DOI:10.1016/j.ijhydene.2023.07.043
摘要
In this experiment, the as-cast CaMg2, CaMg2Ni0.1, CaMg2Zn0.1, CaMg2Ti0.1 ternary alloys have been successfully developed through vacuum melting induction method. The phase compositions and microstructures of these alloys were characterized using X-ray diffraction and scanning electron microscopy. Subsequently, we investigated the kinetics and microscopic mechanism of hydrolysis in MgCl2 aqueous solution for both as-cast and hydrogenated alloys. The hydrogen production curves were fitted at different temperatures using the nucleation-growth Avrami model, which exhibited a good fit to the hydrolysis kinetics. Our findings revealed that the hydrides obtained through H2 absorption exhibited fast hydrolysis reaction rates. Notably, CaMg2Ti0.1 alloy demonstrated excellent hydrolysis properties, with a yield of 1020 mL/g and an activation energy of 37.77 kJ/mol. The activation energy of H–CaMg2Ti0.1 alloy decreased to 15.66 kJ/mol, attributed to the synergistic catalytic effect of TiH2 phase and Ca4Mg3H12 phase. These hydrides exhibited ease of hydrolysis, releasing H+ ions to generate H2 gas. Furthermore, the hydrolysis properties of the as-cast alloys were observed that ranked as CaMg2Ti0.1 > CaMg2Zn0.1 > CaMg2 > CaMg2Ni0.1. However, the order of hydrogenated alloys changed to CaMg2Ti0.1 > CaMg2Zn0.1 > CaMg2Ni0.1 > CaMg2, indicating the synergistic catalytic effect between the Mg phase and Mg2NiH4. Among the Mg-based alloys, Ca–Mg-based alloy hydrolysis showed a research trend towards improving the kinetic properties through alloying.
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