摘要
以金属Mo,Al,Cr,W可溶盐为添加物,通过共沉淀法由FeCl3和(NH4)2Fe(SO4)2?6H2O的水溶液制备了单金属添加的Fe3O4改性储氢材料.采用循环储氢性能评价方法,研究了材料的储氢性能;利用X射线粉末衍射、SEM扫描电镜和BET比表面积测试手段,分析了材料储-放氢前后的微观结构.结果表明:添加了Mo金属的Fe3O4材料四次循环的放氢温度最低,为310～314℃(放氢速率为300μmol?min-1?Fe-g-1),低于目前同类最好的储氢材料(50℃左右);对材料的微观结构研究表明:采用本文方法制备的金属添加的Fe3O4储氢材料其粒度大约在50～70nm.此外,材料的催化活性主要与掺杂的金属类型和材料粒度的大小有关.
Modified Fe3O4 samples for hydrogen storage with different metal additives （Mo, Al, Cr, W） used in this work were prepared by precipitation of Fe3O4 from the aqueous solution of FeCl3 and （NH4）2Fe（SO4）2·6H2O. The apparatus used for the reduction and reoxidation of Fe3O4-Mo, Fe3O4-Al, Fe3O4-Cr, Fe3O4-W and Fe3O4-none samples was a value system of the performance of hydrogen storage with a fixed bed of the samples at the center of a quartz-made tubular reactor. These samples were characterized and measured by X-ray powder diffraction, scanning electron microscope and BET surface area analyzer. The results show that the temperatures of the samples Fe3O4-Mo in their 4 cyclic tests in the range of 310-314 ℃ （the flow rate of H2 was 300 μmol·min^-1·Fe-g^-1 at this time）, were lower than that of the Fe3O4-none, and even lower than that of similar best one by 50 ℃. Moreover, the size of the samples Fe3O4 prepared by the present method used in this paper was 50-70 nm. Furthermore, cyclic stabilities and catalyric activities of the samples depended on the type of added metal and the size of the particle of the samples.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2007年第7期601-606,共6页
Acta Chimica Sinica
基金
国家自然科学基金(No.20673082)
教育部留学回国人员科研启动基金(No.2006331)
陕西省科技计划攻关项目(No.2005K07-G2)
陕西省教育厅专项基金(No.06JK167)资助项目.
关键词
改性Fe3O4
储氢材料
储氢性能
循环稳定性
modified Fe3O4
hydrogen storage material
hydrogen storage property
cyclic stability
