Farjoo Afrooz, Kuznicki Steve M, Sadrzadeh Mohtada
Department of Chemical and Materials Engineering, 12-372 Donadeo Innovation Center for Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada,
Department of Mechanical Engineering, 10-367 Donadeo Innovation Center for Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Materials (Basel). 2017 Oct 6;10(10):1159. doi: 10.3390/ma10101159.
Single and multicomponent gas permeation tests were used to evaluate the performance of metal-supported clinoptilolite membranes. The efficiency of hydrogen separation from lower hydrocarbons (methane, ethane, and ethylene) was studied within the temperature and pressure ranges of 25-600 °C and 110-160 kPa, respectively. The hydrogen separation factor was found to reduce noticeably in the gas mixture compared with single gas experiments at 25 °C. The difference between the single and multicomponent gas results decreased as the temperature increased to higher than 300 °C, which is when the competitive adsorption-diffusion mechanism was replaced by Knudsen diffusion or activated diffusion mechanisms. To evaluate the effect of gas adsorption, the zeolite surface isotherms of each gas in the mixture were obtained from 25 °C to 600 °C. The results indicated negligible adsorption of individual gases at temperatures higher than 300 °C. Increasing the feed pressure resulted in a higher separation efficiency for the individual gases compared with the multicomponent mixture, due to the governing effect of the adsorptive mechanism. This study provides valuable insight into the application of natural zeolites for the separation of hydrogen from a mixture of hydrocarbons.
采用单组分和多组分气体渗透测试来评估金属负载斜发沸石膜的性能。分别在25 - 600℃和110 - 160 kPa的温度和压力范围内研究了从低碳烃（甲烷、乙烷和乙烯）中分离氢气的效率。结果发现，与25℃下的单气体实验相比，混合气体中的氢气分离因子显著降低。随着温度升高至高于300℃，单组分和多组分气体结果之间的差异减小，此时竞争吸附 - 扩散机制被努森扩散或活化扩散机制所取代。为了评估气体吸附的影响，在25℃至600℃范围内获得了混合物中每种气体在沸石表面的等温线。结果表明，在高于300℃的温度下，各气体的吸附可忽略不计。由于吸附机制的主导作用，与多组分混合物相比，提高进料压力会使各气体的分离效率更高。这项研究为天然沸石在从烃类混合物中分离氢气的应用方面提供了有价值的见解。
