负载型双金属催化剂的制备及其等离子体催化氨分解制氢性能

发布时间：2018-04-02 02:27

本文选题：等离子体　切入点：Fe-Ni　出处：《物理化学学报》2017年06期

【摘要】：利用等体积浸渍法制备了Fe-Co、Fe-Ni、Mo-Co、Mo-Ni双金属催化剂(总金属含量均为10%(w,质量分数),双金属摩尔比均为1:1),考察了其在等离子体条件下氨分解活性,结果表明Fe-Ni双金属催化剂表现出较好的协同作用。在此基础上,进一步考察了Fe/Ni摩尔比对其活性的影响。结果表明:当Fe/Ni摩尔比为6/4时,氨分解活性最好,而且该双金属催化剂稳定性良好。采用N_2物理吸附、X射线衍射(XRD)、H_2-程序升温还原(H_2-TPR)和高分辨透射电子显微镜(HRTEM)对催化剂的物化性质、还原性能、微观形貌等进行了研究。结果表明:活性较好的Fe-Ni双金属催化剂中,Fe与Ni形成尖晶石结构NiFe_2O_4,该结构有利于Fe和Ni的还原,即活性组分易恢复金属态,这可能是其活性较高的原因。
[Abstract]:Fe-CoCo-Fe-NiMo-Co-Mo-Ni bimetallic catalysts were prepared by equal volume impregnation method. The total metal content was 10 wk, the molar ratio of bimetallic was 1: 1g. The ammonia decomposition activity under plasma condition was investigated.The results showed that Fe-Ni bimetallic catalysts exhibited good synergistic effect.On this basis, the effect of Fe/Ni molar ratio on its activity was further investigated.The results show that when the molar ratio of Fe/Ni is 6 / 4, the ammonia decomposition activity is the best, and the bimetallic catalyst has good stability.The physicochemical properties, reduction properties and micromorphology of the catalysts were studied by using NSP _ 2 physical adsorption X _ ray diffraction (XRD) and H2-TPRand HRTEM (high resolution transmission electron microscope).The results showed that nife and Ni formed spinel structure NiFe2O4 in the Fe-Ni bimetallic catalyst with good activity. This structure was favorable to the reduction of Fe and Ni, that is, the active component was easy to recover the metal state, which may be the reason for its high activity.
【作者单位】：大连理工大学化工学院催化化学与工程系精细化工国家重点实验室;大连理工大学物理与光电工程学院;
【基金】：国家自然科学基金(20473016,20673018)资助项目~~
【分类号】：O643.36;TQ116.2

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