Self-ignition combustion synthesis of LaNi_5 at different hydrogen pressures
Self-ignition combustion synthesis of LaNi_5 at different hydrogen pressures
复制标题
不同氢气压力下自燃燃烧合成LaNi_5
DOI：
10.1016/j.ijhydene.2011.04.017
复制
发表时间：
2011
影响因子：
7.2
通讯作者：
Tomohiro Akiyama
中科院分区：
文献类型：
--
作者：
Naoto Yasuda;Tohru Tsuchiya;Shino Sasaki;Noriyuki Okinaka;Tomohiro Akiyama
利用金属钙的氢化热，在不同氢气压力下进行LaNi 5的自点火燃烧合成（SICS），重点研究了氢气压力对LaNi 5的起燃温度和初始氢化活化的影响。在实验中，将La2O3、Ni和Ca干混，然后在0.1、0.5和1.0MPa的氢气压力下加热，直到由于钙的氢化而着火。自然冷却2 h后回收产物。结果表明，随着氢气压力的增加，着火温度降低.随着氢气压力的增加，产物由块状转变为粉末状。这可能是由于在较高压力下氢化引起的体积膨胀引起的。在初始氢压为0.95 MPa时，在1.0 MPa下获得的产物显示出最高的储氢容量。本研究结果可作为一种创新的LaNi 5的生产路线，而无需传统的La和Ni的熔化。
In this paper, we describe the self-ignition combustion synthesis (SICS) of LaNi5utilizing the hydrogenation heat of metallic calcium at different hydrogen pressures, and focus on the effect of hydrogen pressure on the ignition temperature and the initial activation of hydrogenation. In the experiments, La2O3, Ni, and Ca were dry-mixed, and then heated at 0.1, 0.5, and 1.0 MPa of hydrogen pressure until ignition due to the hydrogenation of calcium. The products were recovered after natural cooling for 2 h. The results showed that the ignition temperature lowered with hydrogen pressure. The products changed from bulk to powder with hydrogen pressure. This was probably caused by volume expansion due to hydrogenation at higher pressure. The product obtained at 1.0 MPa showed the highest hydrogen storage capacity under an initial hydrogen pressure of 0.95 MPa. The results of this research can be applied as an innovative production route for LaNi5without the conventional melting of La and Ni.