论文部分内容阅读
利用自制Ａｌ２Ｏ３微孔膜及Ｒｕ／Ａｌ２Ｏ３改性膜，在常温及５２３～８２３Ｋ范围内对Ｈ２、Ｎ２、ＣＯ２和ＣＨ４的透过膜渗透选择性进行了考察，实验发现，微孔Ａｌ２Ｏ３中Ｈ２、Ｎ２、ＣＯ２和ＣＨ４４种气体及Ｒｕ／Ａｌ２Ｏ３改性膜中的Ｎ２和ＣＨ４两种气体，均主要表现为努森扩散；Ｒｕ／Ａｌ２Ｏ３改性膜对Ｈ２、ＣＯ２有促表面流作用，且随着温度的升高表面流份额增大，在７２３Ｋ时达到最大值，使Ｈ２／Ｎ２分离因子突破努森扩散理想分离因子限制。实验测定Ｈ２和ＣＯ２在Ｒｕ／Ａｌ２Ｏ３改性膜上的平均吸附热分别为３１和３６ｋＪ／ｍｏｌ，属于弱化学吸附，具有产生表面流的能力。
The permeation selectivity of H2, N2, CO2 and CH4 in the permeate membrane was investigated by using homemade Al2O3 microporous membrane and Ru / Al2O3 modified membrane at room temperature and 523-823K. The results showed that the permeation selectivity of H2, N2, CO2 and CH44 gases and N2 and CH4 gases in Ru / Al2O3 modified membranes, respectively, are mainly Nuxen diffusion; Ru / Al2O3 modified membrane on H2, CO2 have a surface flow, and with the The increase of temperature surface flux increased and reached the maximum at 723K, which made the H2 / N2 separation factor break the limit of Nusen diffusion ideal separation factor. The experimental results show that the average adsorption heat of H2 and CO2 on Ru / Al2O3 modified membranes are 31 and 36 kJ / mol respectively, which are weak chemisorption and have the ability to generate surface flow.