Hydrogen storage in nickel catalysts supported on activated carbon
Hydrogen storage in nickel catalysts supported on activated carbon
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DOI：
10.1016/j.ijhydene.2006.07.004
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发表时间：
2007-06
影响因子：
7.2
通讯作者：
M. Zieliński;R. Wojcieszak;S. Monteverdi;M. Mercy;M. Bettahar
中科院分区：
文献类型：
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作者：
M. Zieliński;R. Wojcieszak;S. Monteverdi;M. Mercy;M. Bettahar
我们研究了商业浸渍镍活性炭中的储氢。使用高压容量吸附-解吸系统评估室温下的高压（20-30bars）氢气吸收量。通过N2物理吸附、X射线衍射、透射电子显微镜、金属表面积、氢气程序升温还原和氢气程序升温解吸等手段研究了所制备材料的性能。对影响氢吸收水平的各种因素（金属前体、金属含量、制备方法）进行了检查和讨论。结论是，储存的氢通过金属相上的 H2 离解，然后迁移到载体上，作为溢出物质松散地化学吸附在碳质材料表面。这种氢气也会直接吸附在 623K 氢气预处理诱导的碳受体位点上。在这两种情况下，储存的氢气直接从活性炭载体上解吸。
We have studied hydrogen storage in a commercial activated carbon impregnated with nickel. High-pressure (20–30bars) hydrogen uptake at room temperature was assessed using a high-pressure volumetric adsorption–desorption system. The properties of the prepared materials were studied by means of N2physisorption, X-ray diffraction, transmission electron microscopy, metal surface area, hydrogen temperature programmed reduction and hydrogen temperature programmed desorption. Various factors influencing the level of hydrogen uptake (metal precursor, metal content, method of preparation) were examined and discussed. It is concluded that the hydrogen stored is loosely chemisorbed on the carbonaceous material surface as spilt-over species through H2dissociation on the metal phase then migration onto the support. This hydrogen would also be directly adsorbed on carbon acceptor sites induced by H2-pretreatment at 623K. In both cases, the stored hydrogen directly desorbs from the active carbon support.