Fe_2O_3与TiF_3添加剂对LiBH_4-MgH_2复合氢化物体系的协同催化作用  

Synergistic Catalysis of Fe_2O_3 and TiF_3 Additives on the LiBH_4-MgH_2 Composite

作　　者：张慧[1,2] 周奕汐[1,2] 孙立贤[2] 曹忠[1] 徐芬[3] 刘淑生[2] 张箭[2] 宋莉芳[2] 司晓亮[2] 焦成丽[2] 王爽[2] 李志宝[2] 刘双[2] 李芬[2] 

机构地区：[1]长沙理工大学化学与生物工程学院,长沙410004 [2]中国科学院大连化学物理研究所,大连116023 [3]辽宁师范大学化学化工学院,大连116029

出　　处：《高等学校化学学报》2012年第4期781-785,共5页Chemical Journal of Chinese Universities

基　　金：国家"九七三"计划项目(批准号:2010CB631303);国家自然科学基金(批准号:20833009;51071146;21173111;20903095;51071081;51101145;U0734005;51102230);广东省-中国科学院联合基金(批准号:2010A090100034)资助

摘　　要：通过球磨方法制备出2LiBH4-MgH2,2LiBH4-MgH2-10%Fe2O3,2LiBH4-MgH2-10%TiF3,2LiBH4-MgH2-5%Fe2O3-5%TiF3和2LiBH4-MgH2-10%Fe2O3-10%TiF35个复合氢化物体系,用热重(TG)、差示扫描量热(DSC)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和压力-组成-温度仪(PCT)等对所制备体系进行表征.结果表明,Fe2O3和TiF3的掺杂均能够有效地改善2LiBH4-MgH2复合体系的放氢性能,尤其是两者共掺杂的2LiBH4-MgH2-10%Fe2O3-10%TiF3体系,初始放氢温度为110℃,总放氢量达到约9.6%.对2LiBH4-MgH2-5%Fe2O3-5%TiF3体系的PCT表征结果表明,在400℃时,10 min内放氢量达到了8.6%,放氢热力学和放氢动力学均优于单一相的掺杂,体现了两相掺杂的协同催化作用.Five systems（2LiBH4-MgH2,2LiBH4-MgH2-10%Fe2O3,2LiBH4-MgH2-10%TiF3,2LiBH4-MgH2-5%Fe2O3-5%TiF3 and 2LiBH4-MgH2-10%Fe2O3-10%TiF3） were prepared by ball milling.They were investigated through thermogravimeteric analysis（TG）,diffraction scanning calorimetric（DSC）,powder X-ray diffraction（XRD）,Fourier transformed infrared spectrometer（FTIR） and pressure-content-temperature（PCT）.The addition of Fe2O3 and TiF3 improved the hydrogen release property of the LiBH4-MgH2 complex system effectively.Especially,the codoped system（2LiBH4-MgH2-10%Fe2O3-10%TiF3） starts to release hydrogen at around 110 ℃ and can release as much as 9.6%.Besides,the results of PCT show that the codoped system（2LiBH4-MgH2-5%Fe2O3-5%TiF3） can release about 8.6% hydrogen within 10 min at 400 ℃.The properties of the codoped system are better than the other two single doped systems,which partly incarnated the synergistic catalysis of Fe2O3 and TiF3.

关 键 词：LiBH4 MgH2 FE2O3 TiF3 协同催化 

分 类 号：O64[理学—物理化学]