Dependence of constituent elements of AB5 type metal hydrides on hydrogenation degradation by CO2 poisoning
Dependence of constituent elements of AB5 type metal hydrides on hydrogenation degradation by CO2 poisoning
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AB5型金属氢化物的组成元素对CO2中毒加氢降解的依赖性
DOI：
10.1016/j.jallcom.2015.05.253
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Fujisawa and S. Miura
中科院分区：
文献类型：
--
作者：
N. Hanada;T. Nakagawa;H. Asada;M. Ishida;Keisuke Takahashi;S.Isobe;I. Saita;K. Asano,Y. Nakamura;A. Fujisawa and S. Miura
LaNi 5-based AB 5 type alloy has high tolerance to CO 2 poisoning for hydrogen purification and storage from 20 to 25% CO 2 mixed gas. To elucidate the CO 2 poisoning factors of AB 5 type alloys, which are LaNi 5, CaNi 5, LaCo 5, and MmNi 4.025 Co 0.4 Mn 0.275 Al 0.3 (Mm-Ni), the dependence of the constituent elements has been investigated on hydrogenation degradation by CO 2 poisoning. The tendency of CO 2 poisoning magnitude is CaNi 5< LaNi 5<< Mm-Ni< LaCo 5, which was evaluated by the hydrogenation rate and capacity under CO 2 partial pressure and after CO 2 exposure. The Ni element of B site in CaNi 5 and LaNi 5 is an important role to maintain higher tolerance of CO 2 poisoning compared to Co element in LaCo 5. Moreover, the element of A site effects on CO 2 poisoning magnitude in AB 5 type alloy. The experimental tendency of CO 2 poisoning magnitude is consistent with the theoretical CO 2 adsorption energy on the (10 1¯ 0) surface plane of− 1.39,− 2.05, and− 2.68 eV for CaNi 5, LaNi 5, and LaCo 5, respectively. CO 2 adsorbs on B site with electron charge transfer from AB 5 alloys to carbon. Not only Ni element in B site but also Ca element in A site decreases the energy of CO 2 adsorption on B site in AB 5 type alloys.
