SiO2包覆对含微量CO氢环境中LaNi4．25Al0．75吸氢动力学性能的影响  

Effect of SiO_2 Encapsulation on Hydrogen Absorption Kinetics of LaNi_(4.25)Al_(0.75) in Hydrogen Atmosphere with Tiny Amount of CO Impurity

作　　者：韩兴博[1,2] 杨洪广[3] 陈伟[1] 刘玉[1,2] 林紫锋 陈德敏[1] 杨柯[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]中国科学院研究生院,北京100049 [3]中国原子能科学研究院,北京102413

出　　处：《稀有金属材料与工程》2013年第12期2525-2529,共5页Rare Metal Materials and Engineering

摘　　要：采用气相二氧化硅法制备了LaNi4.25Al0.75/SiO2复合材料,研究了该复合材料表面形貌以及氢中微量CO对LaNi4.25Al0.75合金及LaNi4.25Al0.75/SiO2复合材料吸氢动力学性能的影响。结果表明:合金被毒化后,在表面生成含NiO、La(OH)3、La2O3、Al(OH)3的氧化层,并且吸附大量CO,导致合金的吸氢量减少,动力学变慢。表面包覆SiO2可显著改善合金抗毒化性能。A LaNi425Al0.75/SiO2 composite was prepared by fumed silica encapsulation method. Microstructure and hydrogen absorption kinetics during hydriding-dehydriding cycling in H2 with 50 mg/L CO were investigated. The results show that apart from large amount of absorbed CO, the surface of LaNi425Al0.75 was covered by NiO, La（OH）3, La203 and AI（OH）3. Although the capacity and kinetics of both the LaNi4.25Alo.75 and LaNi425Al0.75/SiO2 composite were deteriorated after absorption/desorption cycling in the mixed gas, the latter has better poisoning resistance performance.

关 键 词：金属氢化物 SiO2包覆 LANI4 25A10 75 SIO2复合材料 抗毒化 

分 类 号：TG139.7[一般工业技术—材料科学与工程]