铁粉为原料催化改性铁氧化物的储氢性能  

Properties of Hydrogen Storage for Catalytic Modified Iron Oxide Using Fe-powder as Starting Material

作　　者：王新智[1] 李智[1] 王小芳[1] 董发昕[1] 王惠[1] 

机构地区：[1]西北大学化学系陕西省物理无机化学重点实验室,西安710069

出　　处：《化学学报》2008年第4期437-442,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

摘　　要：以Fe粉为原料,以金属Mo,Al和Ni可溶性盐作为添加剂,通过浸渍法制备单金属添加和双金属添加的改性铁氧化物储氢材料Fe-Mo,Fe-Al,Fe-Mo-Ni和Fe-Mo-Al,并研究了它们的储氢性能.结果表明样品Fe-Mo改性效果最好:如放氢温度由改性前的500℃降至改性后的290℃左右;300℃时放氢速率最高,由改性前的低于50μmol·min-1·Fe-g-1到改性后的325μmol·min-1·Fe-g-1(10次平均);4.53wt%的平均实验储氢量与理论值4.8wt%较接近;储-放氢循环稳定性随着循环次数的增加呈逐渐增加的趋势.SEM微观结构和BET比表面积分析表明添加剂的种类对样品的改性作用更重要.Modified iron oxides with single- or double-metal-cation-additive （Fe-Mo, Fe-Al, Fe-Mo-Ni, and Fe-Mo-Al） for hydrogen storage were prepared by an impregnation method using Fe powder as a starting material and their performances of hydrogen storage were investigated in detail. The results show that among all 4 cation-modified samples, the Mo-modified sample is the most favorable one; for example, the temperature of H2 formation for the Fe-Mo was obviously decreased from 500℃ before the addition of Mo to 290 ℃ after the addition of Mo, while the rate of H2 formation was remarkably enhanced from 50 μmol·min^-1·Fe-g^-1 to 325 μmol·min^-1·Fe-g^-1 （average value of 10 cycles） at 300 ℃; the average capacity of hydrogen storage reached 4.53 wt%, closed to theoretical value 4.8 wt%; the cyclic stability of re-oxidation increased with increasing the number of cycles. In addition, the results of SEM and BET surface area show that the kind of meta/cation added to Fe powder is more important for the samples to be modified.

关 键 词：铁氧化物储氢材料 铁粉 金属离子添加剂Mo Al Ni 储氢性能 循环稳定性 

分 类 号：TK91[动力工程及工程热物理]