The hydrogen storage properties and catalytic mechanism of FeCl-doped LiAlHwere investigated in minute details. LiAlH-2 mol% FeClsamples start to release hydrogen at 76 °C, which is 64 °C lower than that of ...The hydrogen storage properties and catalytic mechanism of FeCl-doped LiAlHwere investigated in minute details. LiAlH-2 mol% FeClsamples start to release hydrogen at 76 °C, which is 64 °C lower than that of as-received LiAlH. Isothermal desorption measurements show that the 2 mol% FeCl-doped sample releases 7.0 wt% of hydrogen within 17 min at 250 °C. At lower temperatures of 110 °C and 80 °C, the sample can release 4.4 wt% and 3 wt% of hydrogen, respectively. The apparent activation energy of LiAlH-2 mol% FeClsamples for R2 is 105.02 k J/mol, which is 67 k J/mol lower than that of pure LiAlH. The reaction between LiAlHand FeClduring ball milling was found by analyzing the X-ray diffraction results,and Fe-Al particles formed in-situ from the reaction act as the real catalyst for the dehydrogenation of LiAlH.展开更多
通过PCT设备和XRD对掺杂Ti和Fe的LiAlH4试样进行了研究。结果表明:掺杂Ti和Fe都明显地降低了LiAlH4的放氢温度、放氢量和放氢速率,其中掺杂5mol%Fe试样的放氢温度降低最低,并且放氢量明显地高于掺杂Ti试样的放氢量;和掺杂5mol%Ti的试样...通过PCT设备和XRD对掺杂Ti和Fe的LiAlH4试样进行了研究。结果表明:掺杂Ti和Fe都明显地降低了LiAlH4的放氢温度、放氢量和放氢速率,其中掺杂5mol%Fe试样的放氢温度降低最低,并且放氢量明显地高于掺杂Ti试样的放氢量;和掺杂5mol%Ti的试样相比,掺杂5mol%Fe的试样在第一分解阶段的分解速率明显低于前者;对于经过250 ℃热分解后的掺杂5mol% Fe 和1、3、5mol%Ti的试样的XRD分析结果显示,掺杂催化剂并没有引起晶体结构的变化。展开更多
基金supported by Tianjin Natural Science Foundation 09JCZDJC24800
文摘The hydrogen storage properties and catalytic mechanism of FeCl-doped LiAlHwere investigated in minute details. LiAlH-2 mol% FeClsamples start to release hydrogen at 76 °C, which is 64 °C lower than that of as-received LiAlH. Isothermal desorption measurements show that the 2 mol% FeCl-doped sample releases 7.0 wt% of hydrogen within 17 min at 250 °C. At lower temperatures of 110 °C and 80 °C, the sample can release 4.4 wt% and 3 wt% of hydrogen, respectively. The apparent activation energy of LiAlH-2 mol% FeClsamples for R2 is 105.02 k J/mol, which is 67 k J/mol lower than that of pure LiAlH. The reaction between LiAlHand FeClduring ball milling was found by analyzing the X-ray diffraction results,and Fe-Al particles formed in-situ from the reaction act as the real catalyst for the dehydrogenation of LiAlH.
基金Doctoral Program of the Key Special Scientific Research Ministry of China (20040008015)
文摘通过PCT设备和XRD对掺杂Ti和Fe的LiAlH4试样进行了研究。结果表明:掺杂Ti和Fe都明显地降低了LiAlH4的放氢温度、放氢量和放氢速率,其中掺杂5mol%Fe试样的放氢温度降低最低,并且放氢量明显地高于掺杂Ti试样的放氢量;和掺杂5mol%Ti的试样相比,掺杂5mol%Fe的试样在第一分解阶段的分解速率明显低于前者;对于经过250 ℃热分解后的掺杂5mol% Fe 和1、3、5mol%Ti的试样的XRD分析结果显示,掺杂催化剂并没有引起晶体结构的变化。
