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高真空多层绝热因其超好的绝热性能而广泛的应用于低温储罐,但其夹层真空度会随着材料的放气而逐渐降低,放气的主要成分是氢气。为此,对比研究了新型廉价吸氢剂银分子筛(Ag400)和常规高价吸氢剂氧化钯(PdO)的吸氢特性。分别测定了PdO和Ag400的吸附等温线,根据BDDT理论,均为第一类吸附等温线,属于化学吸附,并用Langmuir等温式进行了分析,PdO的吸附系数为8.11,饱和吸附量为228.53 ml/g;Ag400的吸附系数为8.28,饱和吸附量为29.45 ml/g。Ag400的饱和吸附量,平均最大吸附速率和实验周期内平均吸附速率分别是PdO的13.01%,40.89%和15.92%。综合考虑吸附量和吸附速率,认为Ag400进行PdO的直接替代时,质量比例应不低于10∶1。本文可以为工程设计人员应用新型吸氢剂Ag400提供理论依据。
Because of its excellent thermal insulation properties, high vacuum multi-layer insulation is widely used in cryogenic storage tanks. However, the interlayer vacuum will gradually decrease as the material deflates, and the main component of deflation is hydrogen. To this end, the hydrogen absorption properties of a new type of low-cost hydrogen-absorbing silver molecular sieve (Ag400) and conventional high-cost hydrogen absorbing agent palladium oxide (PdO) were compared. The adsorption isotherms of PdO and Ag400 were determined respectively. According to the theory of BDDT, the first type of adsorption isotherms belong to chemisorption and were analyzed by Langmuir isotherm. The adsorption coefficient of PdO was 8.11 and the adsorption capacity was 228.53 ml / g; the adsorption coefficient of Ag400 is 8.28, the saturated adsorption capacity is 29.45 ml / g. The saturated adsorption capacity, average maximum adsorption rate and average adsorption rate of Ag400 are 13.01%, 40.89% and 15.92% of PdO, respectively. Considering the adsorption capacity and adsorption rate, we consider that when Ag400 is replaced by PdO directly, the mass ratio should not be less than 10: 1. This article can provide a theoretical basis for engineering designers to apply the new type of hydrogen absorbing agent Ag400.