摘要
为提高微米级铝粉的燃烧效率及其对含能分子的催化性能,基于化学气相转移(CVT)方法,制备了微米级铝粉负载铁单原子的催化剂Fe_(1)/Al。采用电感耦合等离子体发射光谱仪(ICP-OES)、球差校正扫描透射电子显微镜(AC-STEM)、X射线吸收精细结构谱(XAFS)及X射线光电子能谱(XPS)等对单原子催化剂的负载量、结构和理化性质进行了表征。通过同步热分析(TG-DSC)对比了CVT方法改性前后材料的热反应性能,并研究了系列材料对1,1′-二羟基-5,5′-联四唑羟胺盐(TKX-50)的催化分解性能。结果表明:基于CVT法制备的催化剂表面铁物种呈现出原子级别的高度分散,使用CVT法可在铁单原子含量及催化剂产量等方面实现可控制备;系列单原子催化剂的热反应性能及其对TKX-50的热催化分解性能较未改性铝粉均表现出显著提升,其中铁负载量(质量分数)为5.0%的Fe_(1)/Al对TKX-50具有最佳催化效果,热催化分解两阶段的反应峰值温度较未改性铝粉降低了19.3℃和39.1℃。该研究实现了铝粉为载体的单原子燃烧催化剂的可控制备,为微米级铝粉的改性提供了新的方法和思路。
To improve the combustion efficiency of micron-sized aluminum powder and its catalytic performance for energetic molecules,iron single-atom catalysts(Fe_(1)/Al)loaded on micron-sized aluminum powder are prepared using the chemical vapor transport(CVT)method in this study.The loading amount,structure,and physicochemical properties of the single-atom catalysts are characterized using inductively coupled plasma optical emission spectrometry(ICP-OES),aberration-corrected scanning transmission electron microscopy(AC-STEM),X-ray absorption fine structure spectroscopy(XAFS),and X-ray photoelectron spectroscopy(XPS).Thermogravimetric differential scanning calorimetry(TG-DSC)is used to compare the thermal reaction performance of the materials before and after modification by CVT method,and the catalytic decomposition performance of a series of materials on dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate(TKX-50)is investigated.Results indicate that the iron species on the surface of the catalysts prepared by the CVT method exhibit a high degree of atomic-level dispersion.The CVT method allows for controlled preparation in terms of iron single-atom content and catalyst yield.The thermal reaction performance of the series of single-atom catalysts,as well as their catalytic decomposition performance on TKX-50,show significant improvements compared to unmodified aluminum powder.Among them,the Fe_(1)/Al catalyst with a loading of 5.0%iron exhibits the best catalytic effect on TKX-50,with a peak temperature of the thermal catalytic decomposition reaction reduced by 19.3℃and 39.1℃compared to unmodified aluminum powder.This study achieves the controlled preparation of single-atom combustion catalysts loaded on aluminum powder,providing a new method and approach for the modification of micron-sized aluminum powder.
作者
刘基丞
刘宣
郑春莉
李鑫哲
曲文刚
LIU Jicheng;LIU Xuan;ZHENG Chunli;LI Xinzhe;QU Wengang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Modern Chemistry Research Institute,Xi’an 710065,China)
出处
《西安交通大学学报》
北大核心
2025年第7期193-201,共9页
Journal of Xi'an Jiaotong University
基金
国防科技重点实验室基金资助项目(2022-JCJQ-LB-037)。
关键词
微米级铝粉
单原子催化剂
化学气相转移
可控制备
TKX-50
micron-sized aluminum powder
single-atom catalysts
chemical vapor transfer
controllable preparation
TKX-50
