含氚废气中杂质气体去除材料研制

为去除含氚惰性废气中的CH₄、水气、O₂等杂质气体，采用溶胶凝胶法制备了65%Ni-10%Cu-25%SiO₂材料作为杂质气体消除材料，对材料进行XRD、SEM及程序升温还原表征，结果显示，少量Cu的加入增加了Ni的分散度，有助于稳定Ni的形态，避免Ni过早发生氧化。材料可以使Ar中的少量CH₄、O₂和水气得到有效的去除，在空速1000 h^-1时Ar中φ=1%CH₄和φ=1%CO₂重整时CH₄去除率达到81.5%以上，对于Ar中φ=1%O₂的去除率达到91.8%以上，对于Ar中φ=1%水气的去除率达到91.7%以上。实验还发现低浓度的CH₄可以与水气及O₂发生反应而去除，空速10000 h^-1催化φ=1%水气和φ=1%CH₄反应，CH₄的去除率均高于80.7%；空速10000 h^-1催化φ=0.67%CH₄和φ=0.33%O₂的反应，CH₄的去除率均高于84.2%。

Preparation of Impurity Elimination Material for Inert Gas Containing Tritium

In order to eliminate CH₄, steam, O₂ in inert gas, 65%Ni-10%Cu-25%SiO₂ is prepared as impurity eliminating material by sol-gel method. At space velocity 1000 h^-1, when φ=1%CH₄ and φ=1%CO₂ in argon is reforming over the material, the conversion of CH₄ is higher than 81.5%. At space velocity 1000 h^-1, when the material reacts with φ=1%O₂ in argon, the conversion of O₂ is higher than 91.8%. At space velocity 1000 h^-1, when the material reacts with φ=1% steam in argon, the conversion of steam is higher than 91.7%. More experiments show that low concentration CH₄ can also reform with O₂ and steam over the material, and CH₄ can be eliminated by the reforming reaction.