水分对分子筛结构及吸附性能的影响

发布时间：2018-03-10 19:14

  本文选题：变压吸附　切入点：分子筛　出处：《材料科学与工艺》2017年03期 　论文类型：期刊论文

【摘要】：分子筛是变压吸附制氧过程中最重要的组分,使用中该组分常出现吸水失效问题,极大地影响了氧产量及浓度.针对此问题,本文以HD-1型和PU-8型分子筛为原料,通过在不同温度(100、200、300、400℃)下活化得到不同含水量的分子筛,并通过对不同材料的结构形貌、热性能及吸附性能的表征分析了水分对分子筛结构及吸附性能的影响.研究结果表明:水分不会破坏分子筛的骨架结构,但会增大晶胞参数,并导致HD-1型分子筛中阳离子迁移;分子筛中的物理吸附水和化学结晶水会影响其吸附性能,其中物理吸附水的影响最大;活化有效提高了分子筛的吸附性能,且温度越高,含水量越少,吸附性能越好;在150~180℃下活化,将物理吸附水脱附后,分子筛的吸附能力可恢复70%,可在此温度下进行吸附器内低温活化;在400℃下活化,脱除化学结晶水,分子筛吸附性能可100%恢复,400℃为两种分子筛的最佳活化温度.
[Abstract]:Molecular sieve is the most important component in the process of oxygen production by pressure swing adsorption. The water absorption failure problem often occurs in the use of molecular sieve, which greatly affects the oxygen production and concentration. In view of this problem, HD-1 and PU-8 molecular sieves are used as raw materials in this paper. The molecular sieve with different water content was obtained by activation at different temperatures, and the structure and morphology of different materials were also studied. The effects of water on the molecular sieve structure and adsorption performance were analyzed. The results showed that water would not destroy the skeleton structure of the molecular sieve, but would increase the unit cell parameters and lead to cationic migration in HD-1 molecular sieve. The physical adsorption water and chemical crystallization water in molecular sieve will affect the adsorption performance of molecular sieve, among which the physical adsorption water will be the most important, the activation can effectively improve the adsorption performance of molecular sieve, and the higher the temperature, the less the water content, the better the adsorbability of molecular sieve. When activated at 150 鈩，

本文编号：1594694